Rock Physics Characteristics of Shale Gas Reservoir in Southeast Sichuan

doi:10.11885/j.issn.1674-5086.2022.09.10.03

Abstract

Abstract: The shale of Longmaxi Formation in Sichuan Basin has become one of main layers of gas exploration in China, because it is rich in organic matter and has a moderate burial depth. Shale reservoirs are characterized by strong non-homogeneity, and the anisotropy of physical parameters and brittleness are affected by various factors, which is not conducive to the logging interpretation and the prediction of seismic “sweet spot”. Based on the above reasons, shale samples are collected in the field geological outcrop section in Shuanghe, Changning, Sichuan, and Sanbaiti of Huaying Mountain, Chongqing. Rock physics test and parameter analysis are conducted in the laboratory. Related research contents include: using X-ray diffraction to analyze the mineral composition and content of rock samples, studying the influence of ambient pressure and temperature change on seismic velocity under test conditions, determining the relationship between seismic velocity and mineral composition, and the change of shale anisotropy parameters. To some extent, the results of research reveal the control effect of clay content in gas reservoir on shale anisotropy and britleness in southeast Sichuan, and summarize the empirical formulas between anisotropic parameters, so as to provide geological basis for rock physical modeling, anisotropic parameter inversion and brittleness evaluation.

Key words: shale gas reservoir, Longmaxi Formation, rock physics, seismic velocity, anisotropy

CLC Number:

TE132

LIU Wenge, YIN Cheng, CHEN Kang, TIAN Fafa, PENG Da. Rock Physics Characteristics of Shale Gas Reservoir in Southeast Sichuan[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(3): 27-36.

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