Shale total organic carbon content earthquake prediction method

Abstract

The invention provides a shale total organic carbon content earthquake prediction method, and belongs to the field of petroleum and natural gas exploration. The method includes the steps of: (1) preparing geological, well logging and seismic data; (2) making a statistical analysis of shale core total organic carbon content geochemical analysis test data, well logging curves and rock elasticity parameter curves, and preferably selecting a well logging curve or rock elasticity parameter curve that has a high degree of correlation with total organic carbon content test data content to establish a total organic carbon content calculation model; (3) utilizing a seismic inversion technology to obtain a curve inversion data body required by the total organic carbon content calculation model; and (4) calculating a shale total organic carbon content data body based on the total organic carbon content calculation model in Step (2) and the curve inversion data body in Step (3).

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas exploration, and in particular relates to a seismic prediction method for the organic carbon content of mud shale. Background technique [0002] In the past two years, unconventional oil and gas resources represented by shale oil and gas have gradually become a hot spot in the field of oil and gas exploration. During the exploration and development of shale oil and gas, the total organic carbon content (Total Organic Carbon, TOC) of shale is a key parameter to evaluate the geological conditions of shale oil and gas accumulation. The basis for high productivity. Scholars at home and abroad have carried out a lot of research work on shale TOC in the past 30 years. For example, Passey et al. proposed the ΔlgR method for evaluating the total organic carbon content of mud shale in their paper "Apractical model for organic richness from porosity and resistivity" in 1990. This method superimpos...

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Problems solved by technology

[0003] (1) Although the TOC data obtained by conventional geochemical analysis of shale cores can accurately evaluate the exploration potential of shale, such analysis can only provide information on the rock properties of shale in local areas, and cannot reflect the Changes in the lateral distribution characteristics of shale;

[0004] (2) The correlation between shale TOC data and wave impedance is poor, and the results of conventional wave impedance inversion can hardly reflect the change of shale TOC;

[0005] (3) Existing earthquake prediction methods can only predict the change of shale TOC qualitatively, but cannot quantitatively predict the change of TOC value of shale

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