Shale gas reservoir fracture modeling method based on microseism monitoring data

Abstract

The invention provides a shale gas reservoir fracture modeling method based on microseism monitoring data. The method comprises the steps that major fractures of a shale gas reservoir subjected to hydraulic fracturing are modeled to obtain a major fracture model by the adoption of a deterministic modeling method according to the time attribute of microseism event points in the microseism monitoring data in combination with original natural fracture information of the shale gas reservoir; on the basis of the major fracture model and within the effective reconstruction volume range for hydraulic fracturing, constraint conditions of space and geometrical parameters for accompanying fracture simulation in the hydraulic fracturing process are determined according to the density attribute of distribution of the microseism event points in the microseism monitoring data in combination with at least one of the direction attribute, the energy magnitude and the opening degree of the microseism event points, and accompanying fractures of the shale gas reservoir subjected to hydraulic fracturing are modeled by the adoption of a stochastic modeling method to obtain a shale gas reservoir facture basic model. By means of the shale gas reservoir fracture modeling method based on the microseism monitoring data, a complex fracture system of the shale gas reservoir can be depicted meticulously and effectively, and the actual fracture characteristics of the shale gas reservoir subjected to hydraulic fracturing can be reflected.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas seismic exploration, and more specifically, relates to a fracture modeling method of a shale gas reservoir geological model used to evaluate the productivity of a shale gas reservoir. Background technique [0002] Shale gas is natural gas extracted from shale formations. It is an important unconventional natural gas resource. The formation and enrichment of shale gas has its own unique characteristics, and it is often distributed in thick and widely distributed shale in the basin. in source rock formations. [0003] With the innovation of shale gas geology and development theory and the progress of key exploration and development technologies, shale gas has entered a stage of great development. China is rich in shale gas resources and has good development prospects, but the degree of exploration and development is very low, and how to establish an accurate geological model of sh...

AI Technical Summary

Problems solved by technology

However, in the prior art, only natural fractures are usually considered in the modeling process of the fracture network system in shale gas reservoirs, which cannot effectively describe the vertical development heterogeneity and seepage characteristics of the fracture system in shale gas reservoirs, making the final simulation The reliability of the results is not high, and the guiding significance for actual production is lost

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