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Reservoir evaluation method for heterogeneous interbedded sand bodies

An evaluation method and heterogeneous technology, applied in earthwork drilling, data processing applications, wellbore/well components, etc., can solve problems such as quantitative evaluation, difficult heterogeneous interbedded sand body reservoirs, etc., and achieve full integration , The calculation process is simple and convenient, and the effect of reducing misjudgment

Inactive Publication Date: 2019-01-11
SOUTHWEST PETROLEUM UNIV +1
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Problems solved by technology

[0004] The object of the present invention is to provide a reservoir evaluation method for heterogeneous interbedded sand body, to solve the problem that it is difficult to quantitatively evaluate the heterogeneous interbedded sand body reservoir in the prior art in actual work, and to realize it as an ordinary The purpose of geological researchers to provide operable quantitative evaluation methods for heterogeneous reservoirs

Method used

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  • Reservoir evaluation method for heterogeneous interbedded sand bodies
  • Reservoir evaluation method for heterogeneous interbedded sand bodies
  • Reservoir evaluation method for heterogeneous interbedded sand bodies

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Embodiment 1

[0026] Such as figure 1 The shown reservoir evaluation method for heterogeneous interbedded sand bodies includes the following steps: (a) combining logging data, seismic data, core data, production performance data, and reservoir heterogeneity research data to conduct Reservoir evaluation parameters are optimized, and the preferred reservoir evaluation parameters are N types of the following parameters: lithology, rock structure, diagenesis, cementation type, support mode, sedimentary microfacies, effective reservoir thickness, porosity, permeability , intralayer permeability variation coefficient, penetration coefficient, grade difference, and average pore throat radius, where N≥3; (b) In all sublayers, use the extreme value method to normalize each selected reservoir evaluation parameter Processing, so that its value is between 0 and 1, and the normalized value is recorded as S i ; Determine the weight coefficient W of each parameter in different sublayers according to the ...

Embodiment 2

[0028] Such as figure 1 The shown reservoir evaluation method for heterogeneous interbedded sand bodies, on the basis of Example 1, also includes step (d): using a three-dimensional geological model to digitize the classification and evaluation results of each sub-layer reservoir Describe and obtain the spatial distribution of each small layer. The preferred reservoir evaluation parameters in step (a) are reservoir effective thickness, porosity, permeability, and intralayer permeability difference. Normalized value S i =P i / P max , where P i is the actual value of the reservoir evaluation parameter in the specified sublayer, P max It is the maximum value of the reservoir evaluation parameter in all sublayers. Sampling points are sorted for each reservoir evaluation parameter in all sublayers, and the average value of the 10% sample points with the largest value is taken as P max . The weight coefficient W of each reservoir evaluation parameter i The calculation metho...

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Abstract

The invention discloses a reservoir evaluation method for heterogeneous interbedded sand bodies. The comprehensive evaluation index CEI of each small layer is obtained through the method, and then, the reservoir classification and evaluation result of each small layer can be obtained. Compared with the calculation process in the prior art, the method is simple and convenient and can be implementedby ordinary geological researchers. The problem that the existing quantitative reservoir evaluation needs to be based on complex mathematical theories is solved. The comprehensive quantitative evaluation of heterogeneous interbedded sand body reservoirs can truly go out of scientific research institutions and advanced laboratories and go deep into the basic design personnel of oil and gas development. The method provides effective geological guidance for the evaluation and development of heterogeneous interbedded sand bodies, and can reduce the misjudgment in the early stage of development and realize the full integration of theoretical research and practical development.

Description

technical field [0001] The invention relates to the field of oil and gas development, in particular to a reservoir evaluation method for heterogeneous interbedded sand bodies. Background technique [0002] Reservoir heterogeneity refers to the spatial inhomogeneity of the parameters that characterize the reservoir, which is a common characteristic of the reservoir. In the evaluation of reservoir development, the heterogeneity of the reservoir refers to the dual heterogeneity of the reservoir, that is, the heterogeneity of the rock that hosts the fluid and the nature and occurrence of the fluid in the rock space. heterogeneity. Reservoir heterogeneity includes both the heterogeneity of macroscopic development characteristics and the heterogeneity of microscopic pore structure. The content of reservoir heterogeneity research is varied, mainly including reservoir heterogeneity classification, evaluation, cause analysis, impact on reservoir properties and fluid properties, imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00E21B47/00G06Q50/02
CPCG06Q50/02E21B47/00E21B49/00
Inventor 卢浩唐洪明刘志斌王贺华杨滔邓勇
Owner SOUTHWEST PETROLEUM UNIV
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