Method for dividing petrophysical facies of tight sand reservoir based on grey theory

A technology for tight sandstone reservoirs and petrophysical facies, which can be used in geophysical measurements, seismology for logging records, and electrical/magnetic exploration, etc., and can solve the problems of complex methods and low effectiveness.

Active Publication Date: 2013-10-02
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Method for dividing petrophysical facies of tight sand reservoir based on grey theory
  • Method for dividing petrophysical facies of tight sand reservoir based on grey theory
  • Method for dividing petrophysical facies of tight sand reservoir based on grey theory

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[0071] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0072] In an embodiment of the present invention, a method for classifying petrophysical facies of tight sandstone reservoirs based on gray theory, refer to Figure 1 to Figure 9 , including the following steps:

[0073] In step a, the rock physical facies classification and evaluation criteria for the target interval of the block are established.

[0074] This step specifically includes: establishing an evaluation index system for the classification and evaluation of petrophysical facies in the target section of the block. Using the classification principle of quantitative evaluation of petrophysical facies in gray theory, carry out the index of fluid layer zone, density, acoustic wave time difference, spontaneous potential, natural gamma ray and its gamma uranium, thorium, potassium content, effective photoelectric absorption cross-section index of each type of pe...

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Abstract

The invention discloses a method for dividing petrophysical facies of a tight sand reservoir based on the grey theory. The method comprises the following steps: step a, building classified evaluation standards for petrophysical facies of block objective intervals; step b, according to the grey theory and the evaluation indexes of the petrophysical facies built in the step a, determining the types of the tight sand reservoir rocks to be processed; step c, according to the types determined in the step b, building a tight gas reservoir parameter model, and acquiring parameters of the tight gas reservoir according to the at least one petrophysical face corresponding to the determined types. Therefore, the method provided by the invention can better evaluate parameters of the tight gas reservoir.

Description

technical field [0001] The invention relates to a method for classifying petrophysical facies of tight sandstone reservoirs, in particular to a method for classifying tight sandstone reservoir petrophysical facies by applying gray theory. Background technique [0002] The petrophysical facies and logging response characteristics of tight gas reservoirs show that the seepage structure and storage performance of tight gas reservoirs are poor, and they have the characteristics of low porosity, low permeability, heterogeneity, nonlinear distribution and complex logging response, resulting in Reservoir pore space is small, pore structure is very complex, and logging interpretation and quantitative evaluation are very difficult. Therefore, the study of tight gas reservoir parameters and gas layer thickness has always been a problem of widespread concern at home and abroad. [0003] The existing technology includes the empirical method of combining density and nuclear magnetic res...

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Application Information

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IPC IPC(8): G01V1/50G01V3/38G06F19/00
Inventor 成志刚张蕾林伟川罗少成李素娟席辉杨智新赵莉郑小敏张泽文李戈理张峰
Owner BC P INC CHINA NAT PETROLEUM CORP
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