A Quantitative Characterization Method for the Development Degree of Permeable Interlayers in Shale

Abstract

The present invention proposes a method for quantitatively characterizing the development degree of permeable interlayers in shale. The method is based on, for example, seismic inversion data volumes of formation lithology attributes, three-dimensional structural modeling data volumes, and drilling data. / The actual drilling lithology data is the calculation unit, and the critical value of the interlayer thickness is used as a constraint. Through the establishment of a mathematical model, the interlayer development strength, interlayer distribution coefficient and interlayer dispersion coefficient are calculated for the drilling well, and then the interlayer is comprehensively calculated through normalization. The development index STI, combined with the main provenance direction determined by the results of the study of the sedimentary facies of the area, for example, is used to calculate the plane distribution of the STI index of the target layer, such as Kriging interpolation. Apply the method of the present invention to compile calculations and programs, and calculate the drilling STI index of the actual exploration work area. The comparison between the calculation results and the drilling histogram shows that the STI value can scientifically, reasonably and quantitatively reflect the development degree of the interlayer in the mud shale, reaching the expectation of the present invention. Effect.

Description

technical field [0001] The invention relates to the technical field of development of oil, natural gas and other resources, in particular to a quantitative characterization method for 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 has attracted extensive attention of researchers as oil and gas reservoirs. According to statistics, no matter at home or abroad, the mud shale intervals in areas where shale oil and gas breakthroughs have been successfully developed have a certain proportion of non-shale rock interlayers, such as carbonate rock, dolomite, gypsum rock, fine sandstone and other relatively high permeability. shale oil and gas production is closely related to the lithology, quantity, thickness, physical properties and distribution scale of the interlayer in the shale [Wang Yong, Song Guoqi, Liu Huimin, et a...

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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