Method of geophysical prospecting of hydrocarbon deposits

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

 

The invention relates to the field of geophysical studies of the earth's crust, in particular to the field of geophysical prospecting of mineral deposits, and can be used to detect inclusions in the mountains and sedimentary rocks, which differs from these species by its physico-chemical properties, in particular hydrocarbons.

There is a method of geophysical prospecting (US patent 3838390, 1974), according to which the geophones and seismometry place so that when you register formed of a two-dimensional grid of reflections. The resulting seismograms process by summing across various systems and areas by the method of common-depth-point.

The disadvantage of this method should recognize the complexity of the placement of geophones and sassoferrato in the area with complex terrain.

There is also known a method of integrated geophysical exploration (US patent 4899322, 1990), under which generate the probing pulse seismic and radar signals, carry out the reception of the reflected signals and their subsequent conversion, enhancement, measurement, filtering and making them the basis of judgments about the presence or absence of deposits.

The disadvantage of this method should recognize its low efficiency, because radar signals weakly activate the accumulation of hydrocarbons.

The known method for the exploration of oil deposits (RU, patent 2143714, 1999), according to which to perform a seismic survey profile and allocate local uplift in areas of local elevations conduct in-depth exploration drilling, as well as the complex electric and magnetic exploration activities, interpret the results, conduct drilling geochemical pits, build a map of isolines of gas content and within the identified zones conduct deep drilling.

The disadvantage of this method should recognize its high cost, caused by drilling wells.

The closest analogue of the proposed method can recognize the method of geophysical prospecting (RU, patent 2191180, 1998), characterized by carrying out prospecting and exploration on the combined profiles of continuous profiling with the use of sources of electric fields and interference sources of elastic waves. When implementing a known method to form the initiation system and control A. processes in heterogeneous geological environment by simultaneous effect on a specified environment sources of electric fields and sources of elastic waves with an intensity exceeding the natural background noise. To do this, before the observation of the profiles on a variety of the sites of a square experimentally determine the optimal parameters of the system of initiation in which A. the processes have high intensity and reliability selection of electric and elastic signals, determine a graph showing the change of the relaxation process of the environment in time after the simultaneous shutdown of sources initiation system, according to the regularities of changes of intensity of the initiation of the electric field determines the value of the total relaxation time tRelto observe the prospecting and exploration. However, differences in the strength values initiated by A. processes of the electric field recorded at the time of shutdown of the sources in the system and corresponding to the extremum of the graph, and the values of the total relaxation time tRelobserve the seismic and electromagnetics, do not exceed the specified measurement accuracy. Then determine the optimal parameters of the sources to observe the prospecting and exploration initiated with A. processes and perform surveillance on the profiles by the impact of the initiating system. Upon completion of the cycle of initiation at the same time turn off the sources of electric and elastic fields, on the same interval profile, placed symmetrically relative to the center within initier the tion, consistently perform surveillance electromagnetics and then the seismic survey, the total time of observations does not exceed the relaxation time tReldefined according to the schedule change of the relaxation of the environment after completion of the observations of the seismic survey system of initiation move on the length of the interval of observations by prospecting and exploration, and the observation cycle is repeated.

The disadvantage of this method should recognize its complexity and the resulting low reliability of the detection of anomalies caused by mineral deposits.

The technical problem to be solved by the proposed technical solution is to develop a method of geophysical exploration for mineral resources.

The technical result obtained by the implementation of the proposed method is to improve the reliability of the allocation of anomalous phenomena, due to the presence of hydrocarbon deposits, whose properties vary with simultaneous effects on the accumulation of seismic and electric fields.

To achieve the technical result of the proposed use method of geophysical prospecting of hydrocarbon deposits, including seismic excitation of oscillations by seismogeological, registration seismic vibrations by the vibration detectors, moving sassovivo what the sources along the profile between seismic excitation oscillation and the excitation of the electric field in the zone of the profile simultaneously with the excitation of seismic vibrations, moreover, the electric field excite through at least two electrodes placed along the profile at a distance from each other, commensurate with the depth of the proposed hydrocarbon deposits, the recording of seismic waves at each fixed position of the vibration sources and geophones, carried out at least once when the supply of electric current to the supply electrodes and at least once in the absence of electrical power to the electrodes, to form the difference of seismic records obtained under the excitation of an electric field and without excitation of the electric field, or seismic sections obtained from records by converting the seismic image section, and change the amplitudes of the reflected waves of seismic and seismoelectric field, and their difference is judged on the presence of anomalous phenomena, due to the presence of hydrocarbon deposits. In the presence of acoustically hard tires, lying over the alleged discovery of hydrocarbons, predominantly register subcritical reflections from them. In a preferred embodiment, the implementation of advanced simultaneously with seismic vibrations recorded using loops or measuring dipoles, along with a step profile commensurate with step m is waiting for the geophones, the magnitude of the electric field, calculate the changes of amplitude characteristics, which take into account when making judgments about the presence of anomalous phenomena, due to the presence of hydrocarbon deposits. According to one implementation options when forming the difference of the received seismic records obtained under the excitation of an electric field and without excitation of the electric field equalize the amplitude of the waves is not associated with the anomaly, due to the presence of hydrocarbon deposits, and injected into account static time shifts, compensating the difference in time of arrival of the waves is not associated with the anomaly, due to the presence of hydrocarbon deposits. In this case, mainly seismic oscillations recorded in the wells located over the area of the location of the proposed reserves.

As a result of experimental studies on the identification of the se and electroseismic effects in natural conditions, it was determined the change of the amplitude-frequency spectra of the reflected seismic signals and increasing variations of the geomagnetic field. It was experimentally established that the DC electric field leads to an increase in the intensity of regular seismic signals, to improve korreliruetsa reflected waves,reducing background and random noise to the enrichment of the spectrum of signals at higher frequencies. Also as a result of experimental studies have shown that seismovision impact on the earth's surface leads to a change in electric and magnetic component of the natural field and the induced polarization. It was found that seismovision changes in these parameters depend on capacity, frequency and time of exposure, as well as the deviation from homogeneity (the presence of foreign bodies) of the studied reservoir, in particular the presence of hydrocarbon deposits. Laboratory tests on rock samples, as well as experiments in wells showed significant changes of the amplitudes of the acoustic signals when exposed to an electric field, and changes the electrical properties of the rocks under the influence of acoustic signals.

In the future, the essence of the proposed method will be disclosed with reference to figure 1, with the following notation is used: line 1 works, electric line 2 AB, the supply electrodes 3 and 4 at the ends of the line AB, the power source 5 of the electrodes 3 and 4, seismoelectromagnetic spit 6, usually consisting of seismic and electrical lines, group 7 geophones, field telemetry module 8 seismoelectromagnetic station receivers 9 magnetic field (induction loops), electric amplifiers 10, to input the am which is connected loops 9. To simplify figure 1 not shown group seismovision sources.

The proposed method in the base case implemented as follows. On the profile 1 works have a standard system of seismic observations of the way the CMP, and seismovision sources can be located inside the detector arrays and outside placement. Along the profile 1 on line 2, offset from profile 1, set the power supply electrodes 3 and 4, and the distance between them is comparable with the distance to the reservoir, which can be located in the reservoir. Since the General structure of the crust in General is known in advance, then determining the approximate depth location of the deposits is not that difficult. Removal of sources of electromagnetic fields (supply electrodes 3 and 4) outside of the profile 1 is caused by the necessity of reducing the impact of surface objects in the background. The grounding of the supply electrodes is performed with the use of screws, and for applying voltage to the electrodes can be used elektrorazpredelenie generating group AGE 100 kVA with a constant current in the line AB value of up to 100 A. as seismic spit 6 when implementing the proposed method typically use a set of connected wires field telemetry module 8, which is connected GRU is dust geophone 7, as well as loops 9 connected to the field of telemetry modules 8 through a low noise amplifier 10. The distance between groups of geophones 7 is usually 25 - 50 m This value as the interval between the next paragraph excitation depends on the required ratio of accumulation of seismic records in the project area. The distance between the loops 9 must be no smaller than the distance between groups of geophones 7, since the speed of propagation of the electric field on the order of magnitude higher than the propagation velocity of seismic waves.

When implementing the method in the base case can be used known telemetry seismoelectromagnetic station SES-1. This station contains a set of single-channel field-measuring modules, allowing measurement of the electromagnetic field and temporary storage of information, which reduces the noise level by eliminating wired or radio telemetry in real time. For multi-component measurements at the point of the profile sets the corresponding number of modules, and control of measuring modules and the collection of information is performed with the use of a control module and telemetry systems.

As a seismic wave source typically use hydraulic seismites the e vibrators, because they allow you to control the spectrum of the generated seismic waves. Work is carried out with the nonlinear sweeps in the frequency range 10 - 100 Hz and a duration of 30 s efforts on the ground within 100 - 200 kN. However, it is possible to use other seismovision sources with characteristics other than those listed.

Registration seismic and, if necessary, the electromagnetic field is carried out in two modes: when the generated electric field and in the grooves after the termination of the generation of an electric field upon excitation only of seismic vibrations. Seismic excitation of oscillations simultaneously with the excitation of the electric field and without excitation electric field is preferably carried out multiple times to increase the signal to noise ratio by stacking of records of seismic and electromagnetic fields. If the accumulation of the signals is not required, it is enough to make one check excitation only seismic field and a one-time registration with the joint excitation of seismic and electric fields.

Pre-processing the received information is the formation of cross-correlation functions of records with reference sweep generated by seismogeological, subsequent processing is the formation depths of the s and time sections by migration of the original records known methods, in particular, using Kirchhoff migration.

Seismic records obtained in the interaction of induced seismic and electric fields, and without that interaction, after pre-treatment differ for two reasons. First, the conditions of excitation of seismic vibrations with repeated exposure may change, in particular due to soil compaction under seismogeological. Secondly, the result of the interaction of seismic and electric fields can change the dynamic characteristics of the reflections that characterize the object of study. Within the mapped between the records, obtained by the interaction of fields and without that interaction, there are the regular waves that are not related to the object of study (regular interference), in particular shallow reflection, useful and regular wave, carrying information about the object of study. Adjustment regular interference of the amplitudes and compensation by introducing a statistical time shifts differences in the time of their arrival by subtracting such records by the differential seismogram receive a differential signal characterizing anomalous phenomena due to the presence of hydrocarbon deposits, because after adjustment interference between them when subsequent visit the Institute of entries are set to zero. A similar effect is obtained when subtracting not only the original seismograms and seismic sections obtained by migration, and if these sections to equalize the intensity and time of arrival of signals corresponding shallow reference boundaries, after subtracting sections receive differential incision, which at the corresponding depths or registration times observed anomalous phenomena, presumably due to the presence of hydrocarbon deposits.

The proposed method is based on the effect of changes in the dynamic characteristics of seismic waves under the influence of interactive seismic and electric fields. This interaction leads to the fact that the maximum distance of the point of excitation from a group of geophones used in the observation system should comply with the conditions of reflection from the boundaries, located near the research object, the subcritical region. Subcritical removal can be easily calculated using the known data on seismic velocities in covering thicker.

Registration using loops or measuring dipole electromagnetic field simultaneously with the registration of seismic vibrations allows to obtain independent information on anomalous phenomena relevant is lubing, presumably due to the presence of hydrocarbon deposits that can improve the accuracy of judgments about the presence or absence of hydrocarbon deposits.

Additional information about the presence of hydrocarbon deposits can be obtained by using additional well seismoelectromagnetic observations (vertical se profiling). Due to the fact that in vertical se profiling register direct wave and the reflection from the object of research, you can easily split the signal changes due to changes in the conditions of excitation of seismic vibrations, and change the reflections from the object of study, due to the imposition of an electric field to seismic. Accordingly, after the adjustment in amplitude and static shifts of the direct wave on the differential seismogram vertical se profiling will be reset along with the reflections from non-target objects whose parameters remain unchanged with the additional imposition of the electric field on the seismic field. On anomalous phenomena on the differential seismogram vertical se profiling is possible to judge the optimality system used observations, the deliveries of the supply line AB, the amount of current in this line is so Dynamic characteristics of the reflections observed within the environment in the vicinity of the object of study, allow us to clarify the nature of anomalous phenomena may characterize the presence of hydrocarbon deposits.

In the future, the proposed method will be revealed on the example of research Ruzevsky field of the Ulyanovsk region.

Seismic observations were carried out along a profile at step seismic reception points equal to 25 m, and the step of excitation points - 50 m using 120 channels in the active placement and removal of 100 m required when working with the vibration of the vibration source. The maximum distance of the point of excitation from the receiving point along the short and the long branches of the locus, respectively 1075 and 2075 m Full rate monitoring system 30. The total length of the arrangement is 3150 m Base groups of geophones is at reception of 20 m (11 devices in increments of 2 m). Step electric modules along the profile is 75 meters as electric receivers use an induction loop in the form of a square of side 10 m Individual elektroterapevtichesky line length of 3150 m contains 50 loops and 50 telemetry modules. The supply electrodes of the line AB is set in the augers depth of 10 - 20 m at the distance of 6 km from each other along a line parallel to the profile AB with removal of 1 to the from the profile line AB. This distance between the feeding electrodes provides the impact on the research object, located at a depth of 2 km For the excitation of seismic use group 4 sassoferrato located on the base 60 m Seismometry radiate sweeps in the frequency range 10-80 Hz with duration of 30 s at First emit 4 sweep without overlap of the electric field, and then 4 sweep with the imposition of an electric field.

Figure 2 shows graphs of the variation of the amplitudes of the reflected waves of seismic and seismoelectric (seismic field with superimposed electric field) fields from the borders in Yasnaya Polyana horizon - C1jp and their difference on the profile 70 Ruzevsky field of the Ulyanovsk region. The joint analysis of the forecast lithologic-capacitive sections, structural maps, graphs amplitudes and their difference allowed us to identify additional evaluation criteria lithological differences and detection of headers, borders, their distribution in thin section bobrikovsky horizon C1bb Yasnaya Polyana horizone C1jp.

On the profile in the area of routes 1÷22 and 28÷60 marked by high values of the amplitudes, which characterizes the presence of Sandstone in the section. In addition, the difference of the amplitudes shows that the amplitude of seismoelectric field below seismic; both of these criteria is characterized by Sandstone-collector. This conclusion is confirmed by the forecast lithologic-capacitive section and structural constructions with some small residual of the boundary contours. Next on the profile marked decrease of the values of the amplitudes of the two wave fields (route 60÷104), which according to the established criteria corresponds to the replacement of Sandstone on clay, but on the difference of the amplitudes in the area of the tracks 94÷104 this area corresponds to the collector, despite the low values of the amplitudes. The presence in the field of routes 94÷104 proposed collector confirmed some structural uplift, located South of Ruzevsky patterns, and forecast lithologic-capacitive section. Thus, the analysis of the results shown in figure 2, allowed the graphs of the amplitudes and their difference to allocate the distribution of reservoirs in the reservoir sandstones bobrikovsky horizon 1-C1bb and area replacement Sandstone clays in the formation. It should be noted that these graphs are fully consistent with the results of the prediction of oil-saturated reservoir sandstones bobrikovsky horizon 1-C1bb.

The application of the proposed method can improve the prediction accuracy while simultaneously reducing the cost of exploration, because the proposed method allows the integration of methods not only at the stage of interpretation, but at the stage n the receipt of raw materials in terms when the fields have a positive impact on each other, with the use of a single se party allows you to cut costs with respect to two independent parties - seismic and electrical.

1. Method of geophysical prospecting of hydrocarbon deposits, including seismic excitation of oscillations by seismogeological, registration seismic vibrations by the vibration detectors, moving seismogeological along the profile between seismic excitation oscillation and the excitation of the electric field in the zone of the profile simultaneously with the excitation of seismic vibrations, characterized in that the electric field excite through at least two electrodes placed along the profile at a distance from each other, commensurate with the depth of the proposed hydrocarbon deposits, the recording of seismic waves at each fixed position of the vibration sources and geophones are conducted at least once when the supply of electric current to the supply electrodes and, at least once in the absence of electrical power to the electrodes, to form the difference of seismic records obtained under the excitation of an electric field and without excitation of the electric field, or seismic sections obtained from the recording of the second by converting the image of the seismic section, and for changing the amplitudes of the reflected waves of seismic and seismoelectric field, and their difference is judged on the presence of anomalous phenomena, due to the presence of hydrocarbon deposits.

2. The method according to claim 1, characterized in that register subcritical reflections from acoustically hard tires, lying over the alleged discovery of hydrocarbons.

3. The method according to claim 1, characterized in that it further simultaneously with seismic vibrations recorded using loops or measuring dipoles, along with a step profile commensurate with the spacing between geophones, the magnitude of the electric field, calculate the changes of amplitude characteristics, which take into account when making judgments about the presence of anomalous phenomena, due to the presence of hydrocarbon deposits.

4. The method according to claim 1, characterized in that when forming the difference of the seismic records obtained under the excitation of an electric field and without excitation of the electric field equalize the amplitude of the waves is not associated with the anomaly, due to the presence of hydrocarbon deposits, and injected into account static time shifts, compensating the difference in time of arrival of the waves is not associated with the anomaly, due to the presence of hydrocarbon deposits.

5. The method according to claim 4, characterized in that mo is seismic oscillations recorded in the wells, located above the region of the location of the proposed reserves.



 

Same patents:

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

FIELD: oil and gas industry.

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EFFECT: higher reliability, higher precision.

FIELD: oil and gas industry.

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FIELD: oil and gas industry.

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EFFECT: higher reliability, higher precision, higher efficiency.

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FIELD: oil and gas industry.

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EFFECT: higher reliability, higher precision.

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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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