Novel method for characterizing complex fracture system of deep shale gas reservoir

Abstract

The invention provides a novel method for characterizing a complex fracture system of a deep shale gas reservoir, which comprises the following steps of: dividing a single well into a natural fracture single well, an artificial fracture single well and a natural fracture and artificial fracture coupled single well according to fracture information of the single well, generating a fracture network model diagram of the single well by adopting a Monte Carlo method in combination with a discrete fracture model, based on the permeability of a fractured low-hole shale reservoir, a single well is divided into an inner area and an outer area by adopting a radial composite model, a dual-hole medium model and a discrete fracture model are combined according to the continuity and heterogeneity of reservoir fractures, and a natural fracture, an artificial fracture and a complex fracture system with the natural fracture and the artificial fracture coupled are subjected to a single-well separation method. And carrying out characterization. The characterization method for the single well complex fracture system is formed, reservoir parameters and fracture parameters can be accurately inverted, the reliability of fracture characterization is improved, and efficient exploration and development are effectively supported.

Description

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AI Technical Summary

Benefits of technology

This patented technology allows us to determine which areas within a subterranean formation have high or low pore pressures by analyzing their properties before drilling (fissuring) them downhole. By dividing this analysis into different zones based upon these characteristics, we aimed at improving our understanding about how oil and gas form underground during exploitation processes such as hydraulic stimulation operations.

Problems solved by technology

This patented technical problem addressed in this patents relates to analyzing complex hydraulic fracturings (complex networks), particularly those with high pores or cracks that may lead to leakages into underground water sources during production operations due to their potential negative impact on groundwater quality and safety concerns. Current techniques involve laborious manual analysis processes involving multiple types of tools like scanning electron microscope images, X ray fluorescence imagers, magnetic resonance tomography devices, and ultrasonics.

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