Quantitative characterization method for development degree of permeable interlayer in shale

Abstract

The invention provides a quantitative characterization method for the development degree of a permeable interlayer in shale. The method is based on a seismic inversion data volume, a three-dimensionalstructure modeling data volume, drilling data and the like of stratum lithology attributes. One virtual / actual drilling lithology data is used as a calculation unit; an interlayer thickness ratio critical value is used as a constraint; by establishing a mathematical model, interlayer development strength, an interlayer distribution coefficient and an interlayer dispersion coefficient of a drilling well are calculated, an interlayer development index STI is comprehensively calculated through normalization processing, a main object source direction determined by results such as zone sedimentaryfacies research and the like is combined, and STI index plane distribution of a target layer is calculated by adopting Kriging interpolation and the like. Calculation and programs are compiled by applying the method, the drilling STI index of the actual exploration work area is calculated, the STI value is displayed by comparing the calculation result with the drilling histogram, the developmentdegree of the interlayer in the shale can be scientifically, reasonably and quantitatively reflected, and the expected effect of the method is achieved.

Description

technical field [0001] The invention relates to the technical field of development of oil, natural gas and other resources, in particular to a method for quantitatively characterizing the development degree of permeable interlayers in mud shale. Background technique [0002] With the successful exploration and development of unconventional oil and gas, especially shale oil and gas, mud shale as an oil and gas reservoir has attracted extensive attention of researchers. Statistics show that, whether domestic or foreign, the shale sections in the areas where shale oil and gas breakthroughs have been successfully developed have a certain proportion of non-argillaceous interlayers, such as carbonate rock, dolomite, gypsum rock, fine sandstone, etc. with relatively high permeability The shale oil and gas production has a great relationship with the lithology, quantity, thickness, physical properties and distribution scale of the interlayers in the shale interval [Wang Yong, Song G...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that in petroleum geological exploration, the degree of development of permeable interlayers in mud shale (including relatively high-permeable interlayers such as carbonate rock, dolomite, gypsum rock, and fine sandstone) can only be described qualitatively, and there is no Quantitative characterization method to quantitatively evaluate the development degree of dissection

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