Shale gas reservoir compressibility evaluation method based on weight distribution

Abstract

The invention discloses a shale gas reservoir compressibility evaluation method based on weight distribution. The shale gas reservoir compressibility evaluation method preferably chooses a compressibility evaluation parameter according to factors of a geological sweet heart and an engineering sweet heart. Starting from an angle of evaluating a shale reservoir gas-bearing property and an easy alterationability potential, the shale gas reservoir compressibility evaluation method integrates a mineral ingredient content and mesomechanics parameters to calculate engineering sweet heart parameters through standardizing geological sweet heart parameters, and constructs a compressibility evaluation model which can perform continuous determination on the reservoir; a geological sweet hear compressibility evaluation index, an engineering sweet heart compressibility evaluation index and a comprehensive compressibility evaluation index can be calculated only through obtaining a shale reservoir total organic carbon content, a vitrinite reflectivity and a mineral constituent content, and thus shale gas reservoir compressibility evaluation is realized. The shale gas reservoir compressibility evaluation method can accurately divide an effective fractured layer segment and a shielding layer segment, and guides fracture design and construction.

Description

technical field [0001] The invention relates to the field of energy technology, in particular to a method for evaluating the compressibility of shale gas reservoirs based on weight distribution. Background technique [0002] At present, the evaluation methods for the compressibility of shale gas reservoirs are mainly divided into two categories: core test evaluation method and compressibility coefficient evaluation method. The core test method comprehensively considers the characteristics of the mineral component content and mechanical parameters, and makes a comprehensive judgment through the relevant test analysis of the shale core. However, because the shale core is fragile, the certainty of the test value cannot be guaranteed due to the difference in the angle of the core and the way of loading during the core test and analysis, and the content of the mineral components obtained by XRD can only represent the minerals of the core sample distribution, the continuity of th...

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Problems solved by technology

However, because the shale core is fragile, the certainty of the test value cannot be guaranteed due to the difference in the angle of the core and the way of loading during the core test and analysis, and the content of the mineral components obtained by XRD can only represent the minerals of the core sample Distributed, the continuity of the reservoir cannot be judged, and the experimental operation is time-consuming and laborious, and it is difficult to promote on-site

The compressibility coefficient evaluation method is to determine each weight by comprehensively considering various factors, and obtain a comprehensive evaluation coefficient through a certain mathematical method. However, the current method has no definite standard for the distribution of weights, and there is also the inability to carry out continuous evaluation of the reservoir. question of judgment

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