Method for geophysical prospecting for determining oil productiveness of cracked carbonate collectors in three-dimensional inter-well space

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.

 

The invention relates to petroleum Geology and can be used to optimize the placement of exploration and production wells on the subject of research on complex data ground-based three-dimensional seismic survey 3D longitudinal waves by the method of common-depth-point, electrical, radioactive, acoustic, seismic, logging, study of the core and well test.

Optimization of well placement is to increase the reliability and validity of the geological conditions of their inception in the form of determining the specific integral capacity fractured carbonate reservoirs, their hydroconductivity and nefteproduktov at any point in the three-dimensional inter-well space.

Geological and geophysical basis of the invention is the fact that the structure of pore space fractured carbonate reservoirs on the currently available latest data obtained using the new method FMS (Plast MicroScanner company Schlumberger), is a combination of vertical, horizontal and inclined cracks with dominance cracks vertical direction (Runmenu, Apostolov and other “structure of the Riphean natural reservoirs Kuyumbinsky and Tersko-Kamovsky areas of the Yurubcheno-Tokhomskoye oil and gas accumulation zones”, oil and gas Geology, No. 4, M, is eonformity, 2003). The same results were obtained when the surface and borehole seismic surveys using longitudinal, shear and converted waves (Kuznetsov V.M. “multi-wave polarization seismic applied to the study of fractured media”, Thesis for the degree of candidate of technical Sciences, M, Vniigenetika, 2000).

The dominance of vertical fractures in carbonate oil reservoirs is a fundamental physical basis for identifying correlations form of seismic pulses at different frequencies, their frequency energy and time spectra (NWO) and the spectral-temporal attributes (EAS) with a specific depth of the integral capacity of fractured carbonate reservoirs, which in turn, directly affect their water permeability and nefteproductproect (Sokolov, H.E. “the Methodology and results of geological-geophysical study of the Riphean neftegazoperspektivnyh deposits of the Central part of the Yurubcheno-Tokhomskoye zone”, the Dissertation on competition of a scientific degree of candidate of geological-mineralogical Sciences, M, VNIGNI, 1995).

At the present time there is no known way to determine nefteproduktov fractured carbonate reservoirs in the interwell space.

Multi-wave polarization survey in the best case ogran is ensured by mapping fractured zones.

Tectonophysical modeling also predicts areal development fractured zones (Zubkov, M., Bondarenko, M. “Prediction of the secondary zones of fracture on the basis of seismic data and tektonofizicheskogo modeling, Geology of oil and gas, PM, No. 11-12, 1999).

Method of studying the changes of the amplitudes of the seismic record, depending on the distance of the geophones to the point of explosion (AVO) allows in favorable environments to predict accumulation of hydrocarbons (HC), but this is mainly possible in terms of terrigenous geological section (sandy porous collectors) and gas deposits (N. Voskresensky. “The state and prospects of development of methods of analysis of the amplitudes of seismic reflections for the prediction of hydrocarbon deposits”, I., issue 4-5 M, Geoinformatic, 2002).

The latest achievement in this direction is the use of PRONY-filtering with the aim of identifying promising areas in the development of hydrocarbon fields (Mitrofanov G.M. Nefedkin IE and other “Using PRONY-filtering with the aim of identifying promising areas in the development of hydrocarbon deposits”. Geophysics, M., EAGO, Special issue, 2001). The increased attenuation of seismic energy on cuts PRONY can be identified with the development zones fractured reservoirs and hydrocarbon deposits.

The known method the Geophysics is the physical exploration to determine the productivity of the oil reservoir (Patent for invention №2098851). The disadvantages of this method for the study of fractured carbonate reservoirs are the following. The method applies only to granular porous reservoir without significant impact fractured component, since the water permeability and then productivity is determined on the basis of knowledge of the radius of the pore channels, the effective specific capacity (the product of the coefficient of porosity on the effective thickness) and dynamic coefficient of viscosity of the fluid at reservoir conditions, use of two-dimensional seismic survey 2D, i.e. not taken into account possible spatial demolition, and detail of such works is insufficient, especially in complex environments and during the operational phase of drilling studied oil and gas properties.

There is also known a method of geophysical prospecting to determine nefteproduktov fractured shale reservoirs in the interwell space (Patent for invention №2225020), is selected as the closest analogue. However, this known method is designed only for the study of fractured shale reservoirs, characterized by subhorizontal relatively long crack, which collects the oil that finds its reflection in the coefficient capacitive differentiation (CUD) on drilling data and well logs, and seismic data in the spectral-temporal PA is amerah, represents the ratio of seismic energy of high frequencies and large times to power the low frequencies and small times, and works of specific spectral densities at the maximum or average frequency and times. In addition, in this method uses two-dimensional seismic survey 2D, the shortcomings of which is indicated above.

Due to these shortcomings can be mistakes in identifying nefteproduktov fractured carbonate reservoirs and, as a consequence, optimal placement of wells and the increase in development costs of objects.

Technical problem on which this invention is directed, is to increase the reliability and validity of the determination of the geological conditions of exploration and production wells on the basis of the forecast of nefteproduktov fractured carbonate reservoirs in the three-dimensional inter-well space.

Method of geophysical prospecting to determine nefteproduktov fractured carbonate reservoirs in the three-dimensional interwell space includes three-dimensional seismic survey 3D longitudinal waves by the method of common-depth-point (CDP), drilling with coring, electrical, radioactive, acoustic and seismic logging, the study of core and well testing.

On set of drilling data and GIS judge the presence of fractured carbonate reservoirs, determine their specific depth integral capacity, water permeability and nefteproductproect. In General cases, the capacity of the reservoir is defined as the product of the coefficient of porosity on the effective thickness. For fractured carbonate reservoirs with primary development of vertical cracks and cavities defining the effective thicknesses at low values of the coefficient of fracture porosity is ambiguous and uncertain process. In such circumstances, management is the use of integral capacity, representing

This approach takes into account different types of porosity, studied fundamentally different methods - acoustic (AK) and neutron-gamma ray (NGR) logging, which increases the reliability of determining the total porosity, and hence the capacity of the target interval incision Δh=h2-h1. Since the capacitance value (q) depends not only on the total porosity, but also the productive capacity of the sediments, it is appropriate to use specific integrated capacity, normalized to 1 m cross-section, ie,

The main factor influencing the permeability (water permeability), is the structure of the pore space, characterized by the shape and size of the pores, the tortuosity and a specific surface area of filtration channels. Usually, larger porosity (capacity) and corresponds to the large permeability.

Permeability (water permeability) of fractured rocks in the General case depends on the geometry of fracture systems and the direction of filtration. Permeability (water permeability) fractured carbonate reservoirs with a predominantly vertical cracks and cavities, and hence the same directions filtering, directly depends on the integral capacity of the oil reservoir.

Nefteproductproect fractured carbonate reservoirs directly functionally connected with the specific integrated capacity and water permeability.

Permeability (water permeability) and nefteproductproect determined by known methods in the study of core and test wells.

All three parameter - specific integrated capacity, water permeability, nefteproductproect defined by drilling data and GIS are the reference for the study of inter-well space using seismic.

According to acoustic, seismic, radioactive logging, laboratory core studies are stiffness model of the target section in the wells, are computed synthetic seismic trace which are SWAN determine the model of the NWO and their spectral-temporal attributes. According to the GIS To determine whether The target interval curves GIS and their borehole (vertical) spectral-temporal attributes (EAS) (Kopelevich E.A., Davydov E.A. and other “Method of typing and correlation neftegazoperspektivnyh rocks in borehole spectral-time parameters”. Patent for invention No. 2201006, 2003).

According to the three-dimensional 3D seismic on the basis of the SWAN determine the reference experimental NWO and their volumetric spectral seismic attributes (OSS) in the area of the wells, corresponding to the time interval of the productive deposits.

Model, borehole IAS and experimental OSS should be the same with CVR>of 0.75, which indicates a reasonable definition of NWO and the OSS according to the 3D seismic. At the higher CVR choose the best for a specific geologic conditions, the most reliable OSS.

ITS seismic data 3D - temporal cube, i.e. the dependence of seismic amplitudes from the three coordinates x, y, t - A=ƒ(x, y, t), is a four-dimensional dependence of seismic amplitudes from the coordinates x, y, ƒ, t or two cube dependencies A=ƒx ƒ, t) and A=ƒ(y, ƒ, t), where ƒ - variable Central the frequency spectra of seismic recording; t - axis is time; x, y spatial coordinates.

ITS characterized quantitatively using OSS for each of the two cubes, with six cubes of OSS, i.e. three-dimensional dependence of OSS from three coordinates - OCCA=ƒ(x, y, t).

The OSS in the number of the pole the attributes determined by the energy (frequency along the frequency axis - f) and time (along the axis of the times -1) spectra of three-dimensional results the SWAN cubes NWO.

OSSA along the frequency axis:

where S(A2)(t) is the spectral density of the frequency power spectrum is proportional to the square of the amplitude of seismic records in the target time interval (Δt); ƒn- the initial (low) frequency spectrum at the level of 10% of its maximum; ƒto- the final (high) frequency spectrum at the level of 10% of its maximum;

Thus, the OSS1is the ratio of the energy of the high frequencies to the energy of low frequency energy of a frequency spectrum

where Δƒ=ƒton;- weighted average frequency.

Thus, the OSS2is the product of the specific power spectral density of the frequency spectrum by the average frequency

where ƒmaxmaximum frequency energy of a frequency spectrum at the level of 30-70% of its maximum.

Thus, the OSS3is the product of the specific power spectral density of the frequency spectrum at the maximum frequency with the level selection (30-70%) of its definition.

OSSA-axis times:

where S(A2)(ƒ), tn, ttothat Δt, tcf,- the same parameters of the energy spectrum, only along the axis of time (t).

Values of OSS axis t are determined by the target shift time interval (Δt) on a constant selected value.

Thus, of the two cubes ITS possible to get a six cubes OCCA1-6in the coordinates x, y, t.

All OSS are initially classified according to their structure in accordance with the principles of structural-formational interpretation (Mushin I.A., Fords LU, Kozlov E.A., Fatianov FI “Structural-structural interpretation of seismic data. M., Nedra, 1990).

Structure OCCA1is that its main purpose is the detection and fixation of the integral indicator of the number of ranks in the analyzed interval of the section and the assessment ratio on dynamic expressiveness, i.e. the shape of the signal, and consequently, its spectrum and the OSS 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 permeability and water permeability, but mainly the total porous volume, i.e. water permeability -where the CRC - factor Pronichev and, h - effective thickness of the reservoir, μ - viscosity fluid, the value for the field is constant.

The structure of the symmetric OCCA1along the axis of the times - OSS4- you can count on the detection of the direction of sedimentation, i.e. to assess the degree of progressivity or regressivity of the analyzed interval of the section, and hence the nature of changes in permeability and hydroconductivity collectors in depth.

OSS2and the OSS3characterize the analyzed interval of the section is mainly based on integral types of stratification and its severity, i.e. macro-, MIDI-, thin-layering, types of periodicity, rhythm, which is directly related to the volume of the void space or capacity.

OSS5and OAAS6having the same structure as the OSS2The OSS3but defined by the axis of the times, can characterize the propagation characteristics of the layering (capacity) for the analyzed interval of the section.

Thus, the OSS by its physical and geological fact can be used to determine the hydroconductivity and capacity nefteproduktov manifolds in three-dimensional inter-well space, and hence nefteproduktov.

The optimal, most reliable experimental reference of OSS in the area of wells or integrated OSS, or represent the work of a convolution optimal OSS by famous modern algorithms cokriging or artificial neural networks, correlated with the values of hydroconductivity and capacity nefteproduktov reservoirs by drilling data and GIS, graphing regression dependencies.

For fractured carbonate reservoirs OCCA1and the OSS4correlated with water permeability, and the OSS2,3,5,6- specific integrated capacity.

When values of CVR>0.75 in Cuba optimal or comprehensive OSS using regression dependencies are translated into cubes integral values of specific capacity, hydroconductivity and nefteproduktov collectors in the coordinates x, y, t.

Thus, this proposal allows to determine nefteproductproect fractured carbonate reservoirs at any point in the three-dimensional inter-well space. This provides a sharp decline in the cost of subsequent drilling exploration and production wells.

Method of geophysical prospecting to determine nefteproduktov fractured carbonate reservoirs in the three-dimensional inter-well space, including, drilling with coring, electrical, radioactive, acoustic, seismic, logging, well testing, and judgment on the obtained information about the presence of fractured carbonate reservoirs, their specific depth integral capacity, hydroconductivity and the oil is Yunosti, characterized in that the inter-well space conduct 3D seismic longitudinal waves by the method of common depth point, according to the drilling and geophysical surveys of the wells define a reference model of seismic and borehole spectral-temporal images nefteproduktov fractured carbonate reservoirs and their spectral-temporal attributes, and 3D seismic data in the area of wells to determine the reference experimental spectral-temporal images nefteproduktov fractured carbonate reservoirs and their volumetric spectral seismic attributes based on the application of spectral-temporal analysis of 3D seismic data in the target recording interval and quantitative evaluation of its results, determined by the product of the specific frequency and time spectral densities of the energy spectra in the frequency and time highs, or on a weighted average of frequency and time, and the ratio of the energy of high frequencies and large times to power the low frequencies and small times, with subsequent cross-correlation unit integral capacity fractured carbonate reservoirs, hydroconductivity and nefteproduktov according to drilling and geophysical surveys of the wells with the reference model seismic, borehole spectral-temporary and and three-dimensional spectral seismic attributes in the district of wells, the choice of the optimal volumetric spectral seismic attributes with the highest values of the coefficients of cross-correlation and building regression dependencies of the optimal reference volumetric spectral seismic attributes, or complex attribute with a specific depth of the integral capacity of fractured carbonate reservoirs and their water permeability and nefteproductproect according to drilling and geophysical surveys of wells; then all the routes temporary seismic cube in the target recording interval hold time-frequency analysis and its quantitative spectral and temporal parameters for optimum surround spectral seismic attributes or complex attribute, build cubes attributes and their subsequent conversion by the established regression dependencies in Cuba specific depth integral tanks, hydroconductivity and nefteproduktov, i.e. the definition of nefteproduktov fractured carbonate reservoirs at any point in the three-dimensional inter-well 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. 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.

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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.

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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.

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

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EFFECT: enhanced precision and reduced cost of prospecting.

4 cl, 2 dwg

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EFFECT: increased accuracy.

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EFFECT: higher efficiency, higher trustworthiness.

2 cl, 6 dwg

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

2 dwg

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