Method for searching and reconnaissance operations concerning oil and gas deposits

FIELD: geophysics.

SUBSTANCE: in accordance to method by transformation of excited and registered wave fields, amplitude-frequency and transfer characteristics of deposits of hydrocarbon resources are formed along lateral line and below face of control well, which are used to determine position and depth of oil-gas deposits. After transformation and comparison of frequency characteristics of longitudinal and transverse resilient oscillations, character of saturation and filtering-capacity properties of oil-gas deposits are determined.

EFFECT: higher efficiency, higher trustworthiness.

2 cl, 6 dwg

 

The invention relates to geophysical methods of prospecting and exploration of oil and gas fields and can be used for prospecting and exploration of hydrocarbons (HC) on land and in the waters.

Most effectively it can be used for prospecting and exploration of hydrocarbon characterized by a multi-tiered geological structure, in which deposits of hydrocarbon separated, are located at great depths and are associated with traps UVS unstructured type, and traps the gas in the form of small-amplitude elevations. The invention can be used to monitor the development and redevelopment of deposits of hydrocarbon in the late stage of operation, when it is extremely necessary involvement in the exploitation of poorly drained, dead ends and stagnant zones.

The known method of prospecting and exploration of hydrocarbons (RU, patent 2217778, G 01 V 1/00, 2003), according to which it is proposed to register seismic background of the Earth for subsequent analysis and to compare it with the standard form of the information signal, measured on a known field UVS.

Significant disadvantages of the method are its low depth, accuracy, robustness and resolution, as a productive part of the reservoir has a low relative power in the study g the ideological perspective and is a subtle heterogeneity in the recorded wave field; in addition, the implementation of the method requires time-consuming research areas with known geological structure.

There is also known a method of prospecting and exploration of hydrocarbons (RU, patent 2161809, G 01 V 1/00, 2001), when as the information signal using the characteristics of microseismic noise of the Earth and spend their comparison with the results of additional generating seismic ground sassoferrato.

The disadvantages of this method are low accuracy, robustness and reliability of measurements, since the contrast of the diagnostic characteristics of the recorded wave fields with the aim of direct prospecting of deposits of hydrocarbon resources is small, and the dynamic range of their variation is very low; the additional complexity of highlighting useful waves in a wide frequency range due to the overlay cratetraining waves and other noise making is problematic in its practical application. In addition, this method cannot be excluded inherent in ground-based methods of registration of the wave field limitations due to insufficient reliable a priori information about the model analyzed in the geological environment, which casts doubt on the next right choice of the location of the exploratory wells.

The closest in technical essence to the invention is the procedure of prospecting and exploration of oil and gas fields (EN, patent 2045079, CL G 01 V 1/00, 1995), including seismic excitation of oscillations by sassoferrato, registration of three-component geophones wave field and its comparison with estestvennim land seismic field.

According to the method of seismic vibrations excite ground-based narrow-band seismic vibrator in the frequency range from 10 to 20 Hz. As an information signal using natural seismic background, recorded both before and after excitation of the oscillations, and the presence of a field judged by the increase in the area under the curve mutual spectrum of the same components when registering seismic background after excitation of seismic vibrations in comparison with the check-up. The disadvantages of this method along with low immunity, reliability and accuracy of the measurements is the complete lack of information about the depth of oil and gas deposits, as this method allows to predict only the contours of oil and gas deposits in the context of a traditional single traps UVS structural type that is too small for prospecting and exploration of complex deposits of hydrocarbon characterized by a tiered structure; in addition, the known method does not allow to assess the spatial contours of the oil and the gas deposits, their fludarabine and reservoir properties.

The aim of the invention is to improve the accuracy of prediction of the spatial position, geometric dimensions, reservoir properties and saturation nature of geological objects.

This objective is achieved in that according to the way of prospecting and exploration of oil and gas fields, including multiple excitation and detection of elastic vibrations on the earth's surface in the seismic frequency range, the registration of natural seismic background in the subsonic range 1-10 Hz and a subsequent comparison of the obtained data, in the process of opening interval of the geological section of the control bore conduct additional periodic excitation of elastic waves in the inner points of the medium in the seismic frequency range of 10-1000 Hz, consistent in time with the radiation on the earth's surface is recorded on the earth's surface wave field induced seismic emission in the range 0.1-1 Hz simultaneously with the reception of elastic waves in the upper part of the drill string, after opening interval of the geological section provide registration of the natural acoustic background in the inner points of the medium in the high frequency range of 1-50 kHz, then these same points excite elastic vibrations in and NR the drill string in the frequency range of 1-50 kHz and record the induced acoustic emission, summarize and compare the measured spectral density of the longitudinal and transverse elastic waves in the range of the recovered amplitude-frequency characteristics of the environment 0.1 Hz-50 kHz and the spectral density of the longitudinal and transverse oscillations in the function of well depth data and their correlation with the ratio of the spectral densities of the reflected vibrations laterally and below the bottom of the borehole to determine the spatial location, the depth, the nature of saturation and reservoir properties of oil and gas deposits.

As a correlated signal when extrapolated laterally and below the bottom of the control wells using the values of the spectral densities and correlation functions of the longitudinal and transverse elastic waves, registered in the internal points of the geological environment, opened the control well, or in the upper part of the drill string at depths corresponding to the reflective seismic boundaries.

Figure 1 presents the list of sequences to implement the method in the form of a functional schema.

Functional diagram includes a control well 1, a drill string 2, borehole acoustic receiving transducers 3 and 4, the downhole high-frequency acoustic emitter 5 in the range of radiation frequencies of 1-50 kHz, low-frequency downhole is locatel 6 in the frequency range of the radiation 10-1000 Hz, mounted in the lower part of the drill string, a ground emitter 7 low-frequency vibrations in the range of radiation frequencies of 10-20 Hz, roaming on the earth's surface on a given system, the excitation of elastic waves, ground 3-component acoustic transducer 8, installed in the upper part of the drill string and mode radiation in the frequency range 1-10 Hz and reception in the frequency range of 1-1000 Hz, surface acoustic 3-component receiver transducers 9, installed on the specified linear or areal surveillance systems near the wellhead, block 10 amplification and filtering of the signal, the correlator 11 for the lower frequency range, the adder 12, the correlator 13 for the high-frequency range, the block 14 measurements of the spectra of longitudinal and transverse high-frequency oscillations, block 15 measurements of the spectra of longitudinal and transverse low-frequency vibrations, the control block 16 range radiation emitters 5, 6 and 7, block 17 synchronization unit 18 summation and measuring the same relationship spectra and spectra of longitudinal and transverse vibrations, the sensor 19, the depth of the well, the unit 20 in-depth control of reflexes to the horizons of the geological section, block 21 of the transformation of the relations of the spectra of longitudinal and transverse oscillations in the values of reservoir properties and oil and gas reservoirs-collecto is s, block 22 registration and display information in function of the depth, frequency and time.

2 shows the tray (dependence 23) to determine the porosity coefficient KPproductive reservoirs.

Figure 3 shows an example of determining the nature of the saturation collector, the ratio of the spectral densities of the longitudinal WP(w) and transverse WS(w) elastic waves with the following dependencies:

24 for the gas-saturated reservoir;

25 - for oil-saturated reservoir;

26 - saturated reservoir.

The method is implemented according to the following sequence of operations.

After registration of natural seismic background receiving acoustic transducers 9 produce periodic, low-frequency radiation of elastic waves on the surface of the emitter 7 in the range of 10-20 Hz, consistent in time with the radiation of elastic waves in the inner points of the medium through the radiator 6, located in the lower part of the drill string 2 (as emitter 6 can be used downhole signal from the interaction of the bit drilled with rock, mud hydrodynamic emitter type Sirena, mechanical emitter and others).

Manage the spectra of excitation of elastic waves emitter 9 in the frequency range 10-20 G and emitter 6 in the frequency range of 10-1000 Hz using block 16. Synchronization of multiple emitters in time is done with the help of block 17.

Using ground-based acoustic transducers 8 and 9 after time selection perform simultaneous reception of reflected (refracted) interference of elastic waves in the frequency range of 10-1000 Hz using the synchronization unit 17 and unit amplification and filtering 10.

At the same time using the acoustic transducer 8, installed in the upper part of the drill string in the stream of drilling fluid, carry out the emission and reception of reflected from the borehole bottom elastic oscillations in the range 1-10 Hz. While on the surface register of induced seismic emission in the low frequency range of 0.1-1 Hz. The presence of two ground-based emitters 7 and 8 in the seismic frequency range along with the recording of induced seismic emission allows to achieve the bandwidth of the radiation and reception of elastic waves in the range of 0.1-1000 Hz, it is necessary to study the frequency characteristics of complex oil and gas fields.

The resolution of the recorded wave field is achieved by matching the duration of radiation of elastic waves in the earth's surface and in the internal points of the environment by control unit 16.

Management total front elastic radiation is of vibration emitters 6, 7 and 8 by adjusting the time delay in a sequence in time of the excitation allows you to control the directivity of the radiation, which is particularly important if there is a directional boundaries reflecting horizons in complex environments.

The choice of frequency bands analysis of elastic waves in subsonic 0.1-10 Hz, the seismic 1-1000 Hz and high-frequency 1-50 kHz frequency ranges is substantiated by the results of numerous experimental tests of this method, when the oil reservoir is considered as anomalous energy area with the appropriate broadband frequency response and pulse transition feature.

In the absence of downhole radiation source 6 when implementing the method can be used ground excitation source in the seismic frequency range; in this case, the admission of elastic waves in the inner points of the medium receiving acoustic transformations 3, 4 in function of the depth monitoring wells.

The recorded interference signals from the outputs of the ground receiving transducers 8 and 9 after amplification, filtering, and time selection block 10 are received at the inputs of the correlator 11, where the measured vzaimokreditovanie (FVC) and autocorrelation (FAK) function low is tonyh fluctuations. Measured in the correlator 11 values FVC and ACTUALLY served on the input unit 15 measures the spectral density of the longitudinal and transverse oscillations of WP(LF)and WS(LF)and to the input of the adder 12, where the operation of multi-temporal summation PVC, allowing to increase the robustness of the measurements.

After opening interval of the geological section inside the drill string flow of washing fluid or the cable is lowered acoustic probe containing the acoustic emitter 5, exciting elastic vibrations in the frequency range of 1-50 kHz, and the acoustic receiving transducers 3 and 4. Adopted by the receiving transducers 3 and 4 elastic vibrations are sent to the input unit 10 and after amplification and filtering on the input of the correlator 13 and further to the input unit of measurement of the spectra of longitudinal and transverse elastic waves, where the values are measured spectra of WP(HF)and WS(HF)in the RF frequency range of 1-50 kHz.

Outputs of blocks 14 and 15 measured values of WP(HF)and WS(HF)enter in block 18 of summation and measuring the same relationship spectra and spectra of longitudinal and transverse elastic waves WP/WS. The sum of the spectral densities in the range 0.1 Hz-50 kHz perform in order to restore full frequency characteristics of the oil and gas mostorod the deposits. A measurement of the ratio of the same name spectra of WPand WSallows a detailed study of the transfer and the transient response of thin-layered geological section.

In block 20 is carried out deep binding spectra of WP(LF)and WS(LF)the reflected low-frequency signals to high-frequency spectral components of elastic waves WP(HF)and WS(HF)registered in the internal points of the environment in function of the depth monitoring wells NGL, which performs the conversion to synthetic spectral diagrams with sequentially changing a coordinate of X0along the ground profiles converters 9, using the relative parameters of the spectral density function is known the depths of monitoring wells 1.

The relative parameter of the spectral density of elastic waves, registered in the well 1 converters 3, 4 (or in the upper part of the drill string using the Converter 8) is defined as

where Hi is the current depth;

ΔH is the sampling depth, chosen depending discreteness WP(NGL).

The relative parameter of the spectral density of the reflected elastic waves registered on the surface using converters 9, the definition is regarded as

For each fixed position obtained as a function of depth NGL charts αSLEand αnaecalculate the correlation coefficient R(αSLE; αnae). Deep and lithologic-stratigraphic anchor charts αSLEand αnaeis the position on the axis of the depths of the NGL, for which the correlation coefficient R has a maximum value.

The correlation coefficient is estimated as follows:

For areas of the geological section, characterized by respective identical (with difference ±5%) values of the correlation coefficients R for the desired reservoir, the nature of saturation is determined by the frequency dependence relationsand the porosity coefficient is estimated using the dependence of WP/WS=aK+mKKpwhere aR; aKthe point of crossing dependencies WP/WSand WS/WPwith the axis of ordinates;

mR; WKthe angular coefficients.

Outputs of blocks 11, 12, 14, 15, 18, 21 the signals arrive at the inputs of the block 22 visualization and information display, where their spatial-temporal reference.

As an example, figure 2 and figure 3 shows the graphs of determining the coefficient of porosity and oil and gas producing horizons, built on dependency WP/WSand WS/WPon one of the search areas of the Orenburg oil and gas field.

The advantages of the proposed method in comparison with the known are that it makes it possible to predict hydrocarbon potential of multilayer deposits laterally and before drilling below the bottom of productive horizons. The method allows to separately delineate and define the spatial location and filtration-capacitive properties of the investigated productive deposits with a high degree of detail in depth, reaching 0.1-0.5 m, which gives the possibility to optimize the choice of the location and profile of exploration and production wells.

This recovery of three-dimensional images of oil and gas deposits using spectral-correlation of the reception and management of spectrum and directivity of the source of excitation of elastic waves significantly improve the accuracy, robustness and resolution method.

1. Method of prospecting and exploration of oil and gas fields, including multiple excitation and detection of elastic the vibrations on the earth's surface in the seismic frequency range, registration of natural seismic background in the subsonic range and subsequent comparison of the received data, wherein, to improve the accuracy of predicting the spatial position, geometric dimensions, reservoir properties and saturation nature of geological objects, in the process of opening interval of the geological section of the control bore conduct additional periodic excitation of elastic waves in the inner points of the medium in the seismic frequency range of 10-1000 Hz, consistent in time with the radiation on the earth's surface is recorded on the earth's surface wave field induced seismic emission in the range 0.1-1 Hz simultaneously with the reception of elastic waves in the upper part of the drill string, after opening interval geological section provide registration of the natural acoustic background in the inner points of the medium in the high frequency range of 1-50 kHz, then these same points excite elastic vibrations inside and outside the drill string in the frequency range of 1-50 kHz and record the induced acoustic emission, summarize and compare the measured spectral density of the longitudinal and transverse elastic waves in the range of the recovered amplitude-frequency characteristics of the environment 0.1 Hz÷50 kHz and otnosheniy spectral density of longitudinal and transverse oscillations in the function of well depth data and their correlation with the ratio of the spectral densities of the reflected vibrations laterally and below the bottom of a well define the spatial location, the depth, the nature of saturation and reservoir properties of oil and gas deposits.

2. The method according to claim 1, characterized in that after restoring the frequency characteristics of the environment as a correlated signal when extrapolated laterally and below the bottom of the control wells using the values of the spectral densities and correlation functions of the longitudinal and transverse elastic waves, registered in the internal points of the geological environment, opened the control well, or in the upper part of the drill string at depths corresponding to the reflective seismic boundaries.



 

Same patents:

FIELD: oil geology, particularly to determine occurrence depths and relief structure of prospective geological horizons.

SUBSTANCE: method involves performing seismic exploration; drilling wells; determining reflection horizon seam depth on the base of drilling data; obtaining dependence of above seam depth as a function of relief altitude and determining interval velocity of upper non-uniform layer for following subsurface geologic imaging.

EFFECT: increased accuracy.

FIELD: prospecting.

SUBSTANCE: method comprises exciting seismic vibration by means of a seismic source, generating simultaneously electric field by means of at least two electrodes, recording seismic vibration at least once when current is supplied to the electrodes and at least once when electric power is not supplied to them, producing the difference of seismic records obtained in the presence and absence of electric field, and detecting anomalous phenomena from the variation of the amplitude of reflected waves of seismic and seismic-electric fields.

EFFECT: enhanced precision and reduced cost of prospecting.

4 cl, 2 dwg

FIELD: oil and gas industry.

SUBSTANCE: method includes performing surface three-dimensional seismic operations using 3D longitudinal waves according to common-depth-point method, drilling wells with extraction of core, electric, radioactive, acoustic and seismic logging, testing of wells, research of core. On basis of total data from drilling and geophysical research of wells, and known criteria, presence of collectors, their capacity, penetrability, hydro-conductivity, oil productiveness, level of water-oil contact, position of oil fields, and also presence of correlative connection between capacity, hydro-conductivity and oil productiveness, are detected and/or estimated. According to data from acoustic, seismic and radioactive logging, and laboratory research of core, liquid models of target deposits are constructed, synthetic seismic trajectories are calculated, along which spectral-temporal analysis is performed and model seismic spectral-temporal and acoustic samples of oil-productive collectors are determined, which together form an oil bed. According to data from surface three-dimensional seismic 3D operations and results of common-depth-point method in area of wells experimental seismic spectral-temporal and pseudo-acoustic images of oil bed are determined. Acoustic and pseudo-acoustic images are estimated using bed-average acoustic and pseudo-acoustic speeds within target range of depths and times. Model seismic, well spectral-temporal analysis results and standard optimal specific results, acoustic and pseudo-acoustic speeds are correlated to capacity, hydro-conductivity, oil productiveness of collectors, regressive dependencies are set as well as mutual correlation coefficient. Along all trajectories of seismic temporal cube within target range of seismic record spectral-temporal analysis is performed and pseudo-acoustic conversions with determining of optimal specific results, pseudo-acoustic speeds and construction of cubes of spectral-speed attributes, which are recalculated to cubes of third powers of capacity, hydro-conductivity and oil productiveness of collectors.

EFFECT: higher reliability, higher precision, higher trustworthiness, higher efficiency.

FIELD: oil and gas industry.

SUBSTANCE: method includes performing three-dimensional seismic operations, drilling wells with taking of core, electrical, radioactive, acoustic and seismic logging, testing of wells. Seismic operations are performed in three-dimensional inter-well space by longitudinal waves on basis of common deep point method. According to data from drilling and geophysical well research standard model seismic and well spectral-temporal images of cracked argillaceous collectors are determined as well as their spectral-temporal attributes. According to data from three-dimensional seismic operations in zone of wells standard experimental seismic attributes are determined and their volumetric spectral seismic attributes on basis of use of spectral-temporal three-dimensional seismic data analysis in target recording interval and numeric estimation of its results. Following mutual correlation of values of coefficients of capacity differentiation and oil productiveness is performed on basis of data from drilling and geophysical wells research with standard model seismic, well spectral-temporal attributes and volumetric spectral-temporal seismic attributes according to three-dimensional seismic data. Optimal volumetric spectral seismic attributes are selected with greatest mutual correlation coefficients and regressive dependencies of optimal volumetric spectral seismic attributes are built, or of a complex attribute, with values of coefficients of capacity differentiation and oil-productiveness of cracked argillaceous collectors according to drilling data and geophysical well research. Along al routes of seismic temporal cube spectral-temporal analysis is performed and its numeric spectral-temporal parameterization on basis of optimal volumetric spectral seismic attributes, or a complex attribute, with construction of attributes cubes and following recalculation thereof according to regressive dependencies to cubes of coefficients for capacity differentiation and oil productiveness.

EFFECT: higher reliability, higher precision.

FIELD: oil and gas industry.

SUBSTANCE: method includes performing three-dimensional seismic operations, drilling wells with extracting of core, electric, radioactive, acoustic and seismic logging, testing of wells. According to data from drilling and geophysical well research type of geological cross-section of target oil-gas productive deposits is determined. According to data from acoustic, seismic and radioactive logging, laboratory research of core, rigidity models of target deposits are set, synthetic seismic routes are calculated, which are used to perform spectral-temporal analysis and standard model seismic spectral-temporal images of oil-gas deposits are also determined. On basis of data of geophysical wells research - acoustic, electric, radioactive logging - well (vertical) standard spectral-temporal images of target range are determined by spectral-temporal analysis of well geophysical research curves. According to three-dimensional seismic operations data in well zone standard experimental spectral-temporal images are determined for oil-gas productive and other types of geological cross-section on basis of use of spectral-temporal analysis of seismic operations data in target recording range. Numeric estimation of model, well and experimental spectral-temporal images is performed. Model, well and spectral-temporal attributes and experimental volumetric spectral seismic attributes should correlate mutually with mutual correlation coefficient more than 0.75. Greatest mutual correlation coefficients are used to select optimal volumetric spectral seismic attributes. Along all routes of seismic temporal cube in target range of recording spectral-temporal analysis is performed and its numeric spectral-energetic parameterization by frequency and time with construction of cubes for optimal volumetric spectral seismic attributes or complex volumetric spectral seismic attribute. Results are compared to standard optimal volumetric seismic spectral attributes and different types of geological cross-section are determined numerically in any point of three-dimensional inter-well space with detection of position of oil-gas productive types of geological cross-section.

EFFECT: higher reliability, higher precision.

FIELD: oil and gas industry.

SUBSTANCE: method includes performing three-dimensional seismic-prospecting operations, drilling wells with taking of core, electric, radioactive, acoustic and seismic logging, testing of wells. In inter-well space seismic-prospecting operations are performed in longitudinal waves according to deep point method. On basis of drilling and geophysical research data standard modeling seismic and well spectral-time samples of oil-productive cracked carbonate collectors and their spectral-time attributes are determined. On basis of three-dimensional seismic prospecting data in area of wells, standard experimental spectral-time images of oil-productive cracked carbonate collectors are determined as well as their volumetric spectral seismic attributes on basis of use of spectral-time analysis of three-dimensional seismic prospecting data in goal recording range and numeric estimation of its results. Mutual correlation of specific integral capacity of cracked carbonate collectors, hydraulic conductivity and oil productiveness is performed on basis of drilling data and geophysical researches of wells with standard modeling seismic, well spectral-time and volumetric spectral seismic attributes in zone of well. Optimal volumetric spectral seismic attributes are selected with greatest value of mutual correlation coefficients. Regression dependencies of optimal standard volumetric spectral seismic attributes are built, or complex attribute, with depth-specific integral capacity of cracked carbonate collectors, their hydraulic conductivity and oil productiveness on basis of drilling and geophysical well research data are built. Along all tracks of seismic time cube in goal range of recording spectral-time analysis is performed and its numeric spectral-time parameterization on basis of optimal volumetric spectral seismic attributes and their following recalculation on basis of set regression dependencies to cubes of integral depth-specific capacity, hydraulic conductivity and oil productiveness is performed as well.

EFFECT: higher reliability, higher precision, higher efficiency.

FIELD: oil and gas industry.

SUBSTANCE: method includes performing three-dimensional seismic prospecting operations, drilling wells with taking of core, electric, radioactive, acoustic and seismic logging, testing of wells. In inter-well space seismic prospecting operations are performed by three-dimensional longitudinal waves according to deep point method. On basis of drilling data and geophysical well research standard modeling seismic and well spectral-time images of oil-productive deposits and their spectral-time attributes are determined. On basis of data of surface three-dimensional seismic prospecting in area of wells standard experimental spectral-time images and their volumetric spectral seismic attributes are determined on basis of use of spectral-time analysis of seismic prospecting data in goal range of recording and numeric estimation of its results. Following mutual correlation of values of hydraulic conductivity and coefficients of oil productiveness is performed on basis of drilling geophysical well research data with standard modeling seismic, well time-spectral attributes and volumetric spectral time attributes on basis of seismic prospecting data. Optimal volumetric spectral seismic attribute is selected with greatest mutual correlation coefficient. Regression dependencies of optimal spectral seismic attribute are built, or same for complex attribute, with value s of hydraulic conductivity and oil-productiveness coefficient of porous collectors according to drilling and geophysical well research data. Along all tracks of seismic time cube spectral-time analysis is performed and its numeric spectral-time parameterization on basis of optimal volumetric spectral seismic attribute, or complex attribute, with construction of attribute cube and its following recalculation according to regression dependencies to hydraulic conductivity cubes and oil productiveness cubes.

EFFECT: higher reliability, higher precision.

FIELD: oil and gas industry.

SUBSTANCE: method includes performing three-dimensional seismic prospecting operations, drilling wells with taking of core, electric, radioactive, acoustic and seismic logging, testing of wells. On basis of drilling data and geophysical well research standard modeling seismic and well spectral-time images of oil-productive deposits and their spectral-time attributes are determined. On basis of data of surface three-dimensional seismic prospecting in area of wells standard experimental spectral-time images of oil and gas productive porous collectors and their volumetric spectral seismic attributes are determined on basis of use of spectral-time analysis of seismic prospecting data in goal range of recording and numeric estimation of its results. Following mutual correlation of values of hydraulic conductivity and capacity is performed on basis of drilling geophysical well research data with standard modeling seismic, well time-spectral attributes and volumetric spectral time attributes on basis of seismic prospecting data from area of wells. Optimal volumetric spectral seismic attributes are selected with greatest mutual correlation coefficients. Regression dependencies of optimal spectral seismic attribute are built, or same for complex attribute, with values of hydraulic conductivity and oil and gas productive porous collectors capacity according to drilling and geophysical well research data. Along all tracks of seismic time cube spectral-time analysis is performed and its numeric spectral-time parameterization on basis of optimal volumetric spectral seismic attribute, or complex attribute, with construction of attribute cubes and their following recalculation according to regression dependencies to hydraulic conductivity cubes and capacity cubes.

EFFECT: higher reliability, higher precision.

The invention relates to the field of study wells and can be used to quickly identify hidden sources of groundwater contamination in the oil industry

FIELD: oil and gas industry.

SUBSTANCE: method includes performing three-dimensional seismic prospecting operations, drilling wells with taking of core, electric, radioactive, acoustic and seismic logging, testing of wells. On basis of drilling data and geophysical well research standard modeling seismic and well spectral-time images of oil-productive deposits and their spectral-time attributes are determined. On basis of data of surface three-dimensional seismic prospecting in area of wells standard experimental spectral-time images of oil and gas productive porous collectors and their volumetric spectral seismic attributes are determined on basis of use of spectral-time analysis of seismic prospecting data in goal range of recording and numeric estimation of its results. Following mutual correlation of values of hydraulic conductivity and capacity is performed on basis of drilling geophysical well research data with standard modeling seismic, well time-spectral attributes and volumetric spectral time attributes on basis of seismic prospecting data from area of wells. Optimal volumetric spectral seismic attributes are selected with greatest mutual correlation coefficients. Regression dependencies of optimal spectral seismic attribute are built, or same for complex attribute, with values of hydraulic conductivity and oil and gas productive porous collectors capacity according to drilling and geophysical well research data. Along all tracks of seismic time cube spectral-time analysis is performed and its numeric spectral-time parameterization on basis of optimal volumetric spectral seismic attribute, or complex attribute, with construction of attribute cubes and their following recalculation according to regression dependencies to hydraulic conductivity cubes and capacity cubes.

EFFECT: higher reliability, higher precision.

FIELD: oil and gas industry.

SUBSTANCE: method includes performing three-dimensional seismic prospecting operations, drilling wells with taking of core, electric, radioactive, acoustic and seismic logging, testing of wells. In inter-well space seismic prospecting operations are performed by three-dimensional longitudinal waves according to deep point method. On basis of drilling data and geophysical well research standard modeling seismic and well spectral-time images of oil-productive deposits and their spectral-time attributes are determined. On basis of data of surface three-dimensional seismic prospecting in area of wells standard experimental spectral-time images and their volumetric spectral seismic attributes are determined on basis of use of spectral-time analysis of seismic prospecting data in goal range of recording and numeric estimation of its results. Following mutual correlation of values of hydraulic conductivity and coefficients of oil productiveness is performed on basis of drilling geophysical well research data with standard modeling seismic, well time-spectral attributes and volumetric spectral time attributes on basis of seismic prospecting data. Optimal volumetric spectral seismic attribute is selected with greatest mutual correlation coefficient. Regression dependencies of optimal spectral seismic attribute are built, or same for complex attribute, with value s of hydraulic conductivity and oil-productiveness coefficient of porous collectors according to drilling and geophysical well research data. Along all tracks of seismic time cube spectral-time analysis is performed and its numeric spectral-time parameterization on basis of optimal volumetric spectral seismic attribute, or complex attribute, with construction of attribute cube and its following recalculation according to regression dependencies to hydraulic conductivity cubes and oil productiveness cubes.

EFFECT: higher reliability, higher precision.

FIELD: oil and gas industry.

SUBSTANCE: method includes performing three-dimensional seismic-prospecting operations, drilling wells with taking of core, electric, radioactive, acoustic and seismic logging, testing of wells. In inter-well space seismic-prospecting operations are performed in longitudinal waves according to deep point method. On basis of drilling and geophysical research data standard modeling seismic and well spectral-time samples of oil-productive cracked carbonate collectors and their spectral-time attributes are determined. On basis of three-dimensional seismic prospecting data in area of wells, standard experimental spectral-time images of oil-productive cracked carbonate collectors are determined as well as their volumetric spectral seismic attributes on basis of use of spectral-time analysis of three-dimensional seismic prospecting data in goal recording range and numeric estimation of its results. Mutual correlation of specific integral capacity of cracked carbonate collectors, hydraulic conductivity and oil productiveness is performed on basis of drilling data and geophysical researches of wells with standard modeling seismic, well spectral-time and volumetric spectral seismic attributes in zone of well. Optimal volumetric spectral seismic attributes are selected with greatest value of mutual correlation coefficients. Regression dependencies of optimal standard volumetric spectral seismic attributes are built, or complex attribute, with depth-specific integral capacity of cracked carbonate collectors, their hydraulic conductivity and oil productiveness on basis of drilling and geophysical well research data are built. Along all tracks of seismic time cube in goal range of recording spectral-time analysis is performed and its numeric spectral-time parameterization on basis of optimal volumetric spectral seismic attributes and their following recalculation on basis of set regression dependencies to cubes of integral depth-specific capacity, hydraulic conductivity and oil productiveness is performed as well.

EFFECT: higher reliability, higher precision, higher efficiency.

FIELD: oil and gas industry.

SUBSTANCE: method includes performing three-dimensional seismic operations, drilling wells with extracting of core, electric, radioactive, acoustic and seismic logging, testing of wells. According to data from drilling and geophysical well research type of geological cross-section of target oil-gas productive deposits is determined. According to data from acoustic, seismic and radioactive logging, laboratory research of core, rigidity models of target deposits are set, synthetic seismic routes are calculated, which are used to perform spectral-temporal analysis and standard model seismic spectral-temporal images of oil-gas deposits are also determined. On basis of data of geophysical wells research - acoustic, electric, radioactive logging - well (vertical) standard spectral-temporal images of target range are determined by spectral-temporal analysis of well geophysical research curves. According to three-dimensional seismic operations data in well zone standard experimental spectral-temporal images are determined for oil-gas productive and other types of geological cross-section on basis of use of spectral-temporal analysis of seismic operations data in target recording range. Numeric estimation of model, well and experimental spectral-temporal images is performed. Model, well and spectral-temporal attributes and experimental volumetric spectral seismic attributes should correlate mutually with mutual correlation coefficient more than 0.75. Greatest mutual correlation coefficients are used to select optimal volumetric spectral seismic attributes. Along all routes of seismic temporal cube in target range of recording spectral-temporal analysis is performed and its numeric spectral-energetic parameterization by frequency and time with construction of cubes for optimal volumetric spectral seismic attributes or complex volumetric spectral seismic attribute. Results are compared to standard optimal volumetric seismic spectral attributes and different types of geological cross-section are determined numerically in any point of three-dimensional inter-well space with detection of position of oil-gas productive types of geological cross-section.

EFFECT: higher reliability, higher precision.

FIELD: oil and gas industry.

SUBSTANCE: method includes performing three-dimensional seismic operations, drilling wells with taking of core, electrical, radioactive, acoustic and seismic logging, testing of wells. Seismic operations are performed in three-dimensional inter-well space by longitudinal waves on basis of common deep point method. According to data from drilling and geophysical well research standard model seismic and well spectral-temporal images of cracked argillaceous collectors are determined as well as their spectral-temporal attributes. According to data from three-dimensional seismic operations in zone of wells standard experimental seismic attributes are determined and their volumetric spectral seismic attributes on basis of use of spectral-temporal three-dimensional seismic data analysis in target recording interval and numeric estimation of its results. Following mutual correlation of values of coefficients of capacity differentiation and oil productiveness is performed on basis of data from drilling and geophysical wells research with standard model seismic, well spectral-temporal attributes and volumetric spectral-temporal seismic attributes according to three-dimensional seismic data. Optimal volumetric spectral seismic attributes are selected with greatest mutual correlation coefficients and regressive dependencies of optimal volumetric spectral seismic attributes are built, or of a complex attribute, with values of coefficients of capacity differentiation and oil-productiveness of cracked argillaceous collectors according to drilling data and geophysical well research. Along al routes of seismic temporal cube spectral-temporal analysis is performed and its numeric spectral-temporal parameterization on basis of optimal volumetric spectral seismic attributes, or a complex attribute, with construction of attributes cubes and following recalculation thereof according to regressive dependencies to cubes of coefficients for capacity differentiation and oil productiveness.

EFFECT: higher reliability, higher precision.

FIELD: oil and gas industry.

SUBSTANCE: method includes performing surface three-dimensional seismic operations using 3D longitudinal waves according to common-depth-point method, drilling wells with extraction of core, electric, radioactive, acoustic and seismic logging, testing of wells, research of core. On basis of total data from drilling and geophysical research of wells, and known criteria, presence of collectors, their capacity, penetrability, hydro-conductivity, oil productiveness, level of water-oil contact, position of oil fields, and also presence of correlative connection between capacity, hydro-conductivity and oil productiveness, are detected and/or estimated. According to data from acoustic, seismic and radioactive logging, and laboratory research of core, liquid models of target deposits are constructed, synthetic seismic trajectories are calculated, along which spectral-temporal analysis is performed and model seismic spectral-temporal and acoustic samples of oil-productive collectors are determined, which together form an oil bed. According to data from surface three-dimensional seismic 3D operations and results of common-depth-point method in area of wells experimental seismic spectral-temporal and pseudo-acoustic images of oil bed are determined. Acoustic and pseudo-acoustic images are estimated using bed-average acoustic and pseudo-acoustic speeds within target range of depths and times. Model seismic, well spectral-temporal analysis results and standard optimal specific results, acoustic and pseudo-acoustic speeds are correlated to capacity, hydro-conductivity, oil productiveness of collectors, regressive dependencies are set as well as mutual correlation coefficient. Along all trajectories of seismic temporal cube within target range of seismic record spectral-temporal analysis is performed and pseudo-acoustic conversions with determining of optimal specific results, pseudo-acoustic speeds and construction of cubes of spectral-speed attributes, which are recalculated to cubes of third powers of capacity, hydro-conductivity and oil productiveness of collectors.

EFFECT: higher reliability, higher precision, higher trustworthiness, higher efficiency.

FIELD: prospecting.

SUBSTANCE: method comprises exciting seismic vibration by means of a seismic source, generating simultaneously electric field by means of at least two electrodes, recording seismic vibration at least once when current is supplied to the electrodes and at least once when electric power is not supplied to them, producing the difference of seismic records obtained in the presence and absence of electric field, and detecting anomalous phenomena from the variation of the amplitude of reflected waves of seismic and seismic-electric fields.

EFFECT: enhanced precision and reduced cost of prospecting.

4 cl, 2 dwg

FIELD: oil geology, particularly to determine occurrence depths and relief structure of prospective geological horizons.

SUBSTANCE: method involves performing seismic exploration; drilling wells; determining reflection horizon seam depth on the base of drilling data; obtaining dependence of above seam depth as a function of relief altitude and determining interval velocity of upper non-uniform layer for following subsurface geologic imaging.

EFFECT: increased accuracy.

FIELD: geophysics.

SUBSTANCE: in accordance to method by transformation of excited and registered wave fields, amplitude-frequency and transfer characteristics of deposits of hydrocarbon resources are formed along lateral line and below face of control well, which are used to determine position and depth of oil-gas deposits. After transformation and comparison of frequency characteristics of longitudinal and transverse resilient oscillations, character of saturation and filtering-capacity properties of oil-gas deposits are determined.

EFFECT: higher efficiency, higher trustworthiness.

2 cl, 6 dwg

FIELD: geology, particularly to predict aerial extent and localization of metal, non-metal and fuel deposits of any genesis and age.

SUBSTANCE: method involves discovering geological structures and determining perspective zones for further deposit prospecting. In the case of ore deposit prediction above perspective zones are determined in low-order dome and composite type structures allied with crystal magma chambers and located over faults of different orders or in areas in which faults of one or several classes intersect. In the case of gravel deposit prediction the zones are determined in area located near ore deposits in neighboring low-order depression structures. In the case of oil and gas reservoir prediction the zones are prospected in all medium-order structures along radial, ring or oval fault areas and along super-deep ring or oval fault areas in zones in which crystal magma chambers are absent.

EFFECT: increased efficiency of aerial deposit extend and age prediction.

2 dwg

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