Method of geophysical prospecting to determine reservoir properties neftegazoperspektivnyh deposits in the inter-well space

 

(57) Abstract:

Usage: in petroleum Geology to optimize the placement of exploration and production wells on the examined object on the complex data of the ground seismic, electrical, radioactive, acoustic, seismic, logging, study of the core and test wells. Essence: conduct seismic work, drilling with coring, electrical, radioactive, acoustic, seismic, well logging, well testing. According to the drilling and geophysical surveys of wells to determine the model of the reference spectral-temporal images neftegazoperspektivnyh sediments and their spectral-time parameters, and seismic data in the area of wells to determine the reference experimental spectral-temporal images neftegazoperspektivnyh sediments and their spectral-time parameters. Conduct subsequent cross-correlation values of permeability and storage capacity by drilling data with the reference spectral-time parameters on seismic data in the area of the wells. Select the optimal spectral-time parameters with the highest cross-correlation coefficients. All seismic array is ing spectral and temporal parameters on the optimal parameters with their subsequent conversion by the correlation dependences in the values of permeability and storage capacity at any point in the interwell space. Effect: increase the reliability and accuracy of the study of geological conditions of inception of exploration and production wells.

The invention relates to petroleum Geology and can be used to optimize the placement of exploration and production wells on the examined object on the complex data of the ground seismic, electrical, radioactive, acoustic, seismic, logging, study of the core and well test.

Conduct seismic work, drilling with coring, electrical, radioactive, acoustic, seismic, logs, study of core test wells. The sum of the data of drilling and geophysical research wells (GIS) to determine the porosity, the effective thickness, capacity and permeability neftegazoperspektivnyh sediments. According to acoustic, seismic, and radioactive logging, laboratory core studies are stiffness model in wells, are computed synthetic seismic trace which are the time-frequency analysis (TFA) and define a reference model of the spectral-temporal images (NWO) neftegazoperspektivnyh sediments. the times neftegazoperspektivnyh deposits on the basis of spectral analysis (TFA) seismic data in the target recording interval. Produce a quantitative evaluation of the model and ITS experimental use of work specific frequency and time spectral densities of the energy spectra in the frequency and time highs, and the relationship of energy to high frequencies and large times to power the low frequencies and smaller. Reference model and experimental seismic spectral-time parameters (SVP) are mutually correlated with each other, with the capacity and permeability neftegazoperspektivnyh deposits by drilling data with the construction of the reference correlation charts and the assessment of the closeness of connections the correlation coefficient (ICC). Select the most suitable (optimal) spectral-time parameters with the highest cross-correlation coefficients of model and experimental SVP data drilling capacity and permeability. All seismic profiles continuously in the target recording interval hold time-frequency analysis and the most appropriate (optimal) spectral-temporal parameterization of its results in terms of frequency and time. Spectral-time parameters are translated into capacity and permeability using reference korecki to determine permeability neftegazoperspektivnyh deposits in the inter-well space does not exist, because up to the present time to predict the geological section based on seismic data was used mainly speed, stiffness, temporary thickness does not correlate with the filtration properties of the reservoir, due to the volume of the void space (capacity), and not its structure - a system of interconnected pores, cracks, cavities (permeability).

In many cases, the permeability correlation is associated with the capacity, then, defining the reservoir, it is possible to predict and permeability, but this connection is not always stable and nepovsemestnoy. The closest prototype of its technical nature of the proposed method of geophysical prospecting to determine the permeability neftegazoperspektivnyh deposits in the inter-well space by seismic data is the technology pseudomythological logging (PLC) designed to establish changes in clay content, porosity and permeability within neftegazoperspektivnyh objects (Krylov A. N. Comprehensive geological analysis of seismic reflection data and GIS. Exploration Geophysics. The overview. - M.: IHL "Geoinformmark", 1992; Krylov, A. N. To assess the determination of lithology and reservoir properties is erpretation integrated geophysical information. - M.: Nauka, 1991).

The method is based on optimization of seismic modeling, which boils down to adjust previously estimated values lithologic-acoustic model parameters of the environment that determine the seismic wave field, by repeated calculation of the synthetic seismic traces and comparing them with the real seismic route to achieve an acceptable similarity, and subsequent conversion of the obtained values, speed values of porosity, clay content, permeability on the basis of complex boundary conditions and correlation dependences. If this is not determined by the permeability and the PLC parameter characterizing the permeability.

The disadvantages of the method of the PLC the following:

- acoustic model parameters of the environment are poorly connected with the structure of pore space (permeability) and almost entirely owe to its volume (capacity);

- the PLC parameter characterizing permeability, may be far from its true value due to the presence of uncertainty in the determination of boundary conditions and a preliminary assessment lithologic-acoustic model parameters of the environment at the nodal points of the interwell space.

Known for the th in the interwell space, including land seismic surveys, drilling with coring, electric, radioactive, acoustic, seismic, well logs, the study of the core and subsequent processing of the received information to determine psevdoakusticheskuyu velocity on seismic profiles in the target interval, their mutual correlation with the acoustic velocity and the values of the specific effective capacity by drilling data; constructing a reference correlation plot of psevdoakusticheskuyu speeds from specific effective capacity and conversion psevdoakusticheskuyu velocities in the value of the specific effective capacity neftegazoperspektivnyh deposits anywhere in the interwell space (Kopelevich E. A., B. C. Slavkin and other parameter Definition the specific capacity of the reservoir in the interwell space. Geology of oil and gas 8. - M.: Nedra, 1988; Kopelevich E. A. the variation of the velocity of propagation of longitudinal waves in communication with the capacitive properties of reservoirs". Geology of oil and gas, 10. - M.: Geoinformmark, 1995; Kopelevich E. A. Theoretical rationale and method of quantitative determination of the capacitive properties of reservoirs in the interwell space for the data is Geofizika. - M., 1996).

The main disadvantages of this method are:

- insufficient accuracy interval psevdoakusticheskuyu speeds, especially in environments with a low thickness neftegazoperspektivnyh sediments (<30-50 m);

- insufficient resolution and consequently limited the applicability of the method only in case of significant differences psevdoakusticheskuyu speeds (>300 m/s).

Due to these shortcomings ways-prototypes may be errors in the determination of capacity, and especially permeability neftegazoperspektivnyh sediments and, as a consequence, optimal placement of wells and the increase in development costs of the facility.

Technical problem on which this invention is directed, is to increase the reliability and accuracy of the study of geological conditions of laying new exploration and production wells on the basis of determination of reservoir properties (FES) neftegazoperspektivnyh deposits in the inter-well space.

Method of geophysical prospecting to determine reservoir properties neftegazoperspektivnyh deposits in mischin the th, radioactive, acoustic, seismic, logging, the study of core and well testing.

On set of drilling data to determine the reference porosity, the effective thickness, the specific effective capacity and permeability neftegazoperspektivnyh deposits.

According to acoustic, seismic, and radioactive logging, laboratory core studies are stiffness model in wells, are computed synthetic seismic trace which are SWAN, define a reference model of the NWO and their SVP.

According to seismic-based SWAN determine the reference experimental NWO and their SVPs in area wells.

Reference model and ITS and SVP must be the same with CVR >of 0.75, which indicates a reasonable and reliable determination of NWO and the SVP by seismic data.

The NWO are the results of the SWAN of time sections based on seismic profiles in the form of a Swan column and its frequency (along the frequency axis) and time (on axis) spectra. SVP determined by the spectral densities of these spectra and are 6 parameters that fully characterize the SWAN column, including 3 parameter axis cha is one.

< / BR>
where aithe amplitude of the spectrum at frequency fi;f1and f2- the start and end of the frequency spectrum at the level of 0.1 of its maximum, fcf- the average frequency of the spectrum

< / BR>
K2(f) the specific work of the spectral density of energy of the frequency spectrum by the average frequency of the spectrum

< / BR>
where aithe amplitude of the spectrum at frequency fi; f=f2-f1; f1initial, f2- end of the frequency spectrum at the level of 0.1 of its maximum, fithe frequency ANDi.

TO3(f) is the same as2multiplied by the maximum frequency of the spectrum at the level of 0.7 to its maximum.

< / BR>
SVP temporal spectrum - K4TO5TO6what TO1(f)2(f)3(f) only along the axis of the times.

Given the SVP can be initially classified by their structure in accordance with the principles of structural-formational interpretation (Structural-structural interpretation of seismic data. Mushin, I. A., Brody L. J., Kozlov, E. A., Fatianov F. I. - M.: Nedra, 1990).

Structure SVP K1is that its main purpose is the detection and fixation of the integral indicator of the number of ranks and is therefore its spectrum and SVP, as a consequence of the pore space structure or otherwise - size cross-sectional area of the channels of the porous medium, which is filtered fluid, which is known to characterize the reservoir permeability. The structure of the symmetric K1SVP - K4- you can count on the detection of the direction of sedimentation, i.e. to evaluate the degree of progressivity or regressivity of the analyzed interval of the section, and hence the nature of changes in permeability with depth.

SVP2and K3characterize the analyzed interval of the section, mainly on integral types of stratification, its severity, i.e., the degree of macro-, MIDI-, thin-layering, which is directly related to the volume of the void space or capacity.

SVP K5and K6having the same structure as2TO3but defined by the axis of the times, may characterize the features of the distribution of stratification (capacity) for the analyzed interval of the section.

Reference experimental SVP mutually correlated with the reference values of the specific effective capacity and permeability neftegazoperspektivnyh deposits with the definition of the CVR and the building is kalinya) SVP, which are correlated with the values of capacity and permeability with the highest CVR.

These optimal SVP are provided for all seismic profiles of the study site, and then translated into the values of specific effective capacity and permeability using the correlation graphs.

Thus, this proposal allows to determine reservoir properties neftegazoperspektivnyh deposits anywhere in the interwell space continuously, quantitatively, with model rationale according to land seismic exploration, linked to the results of the borehole research.

This provides a sharp decline in the cost of subsequent drilling exploration and production wells.

Method of geophysical prospecting to determine reservoir properties neftegazoperspektivnyh deposits in the inter-well space, including seismic surveying, drilling with coring, electrical, radioactive, acoustic, seismic, well logging, well testing and judgment data obtained on filtration properties neftegazoperspektivnyh deposits values pronizannye reference spectral-temporal images neftegazoperspektivnyh sediments and their spectral-time parameters, and by seismic data in the area of wells to determine the reference experimental spectral-temporal images neftegazoperspektivnyh sediments and their spectral-time parameters based on the application of spectral-time analysis of seismic data and a quantitative evaluation of its results, defined by the ratio of the energy spectra of high frequencies and large times to the energy spectra of low frequency and small times, as well as product specific frequency and time spectral densities of the energy spectra in the frequency and time highs, with subsequent cross-correlation values of permeability and storage capacity by drilling data with the reference spectral-time parameters on seismic data in the area of wells, the optimal spectral-time parameters with the highest coefficients of correlation and construction of correlation dependencies optimal spectral-time parameters with values of permeability and storage capacity according to drilling, then by all seismic profiles continuously in the target recording interval hold time-frequency analysis and its quantitative spectral and temporal parameters on the optimal parameters with piskarininov space.

 

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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.

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EFFECT: higher reliability, higher precision.

FIELD: oil and gas industry.

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EFFECT: higher reliability, higher precision, 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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EFFECT: higher reliability, higher precision.

FIELD: oil and gas industry.

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EFFECT: enhanced precision and reduced cost of prospecting.

4 cl, 2 dwg

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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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