Pore Connectivity and Oil and Gas Filling Characteristics of Shale Reservoirs in the Qiongzhusi Formation, Southern Sichuan

doi:10.11885/j.issn.1674-5086.2024.09.13.01

Abstract

Abstract: Qiongzhusi Formation in southern Sichuan is rich in shale gas resources, demonstrating significant exploration potential. However, the characteristics of reservoir pore connectivity and the mechanism of oil and gas injection remain unclear. This article studies the pore structure and connectivity characteristics of the Qiongzhusi Formation shale in the study area based on high-pressure mercury injection, low-temperature N$_2$ adsorption, and FIB-SEM experiments. Additionally, the hydrocarbon injection capacity in the Ziyang-Jingyan Area will be investigated in conjunction with shale hydrocarbon generation kinetics simulation. The research indicates that: 1) the organic rich shale layer in the Qiongzhusi Formation of the Jingyan Area has poor pore connectivity, with a pore connectivity rate of 32.8%. However, it has a large hydrocarbon generation and pressurization scale, with a maximum cumulative overpressure of 48.50 MPa. On the other hand, the silty shale layers have good pore connectivity, with a pore connectivity rate of 55.7%, and a hydrocarbon generation and pressurization of 31.60 MPa; 2) the scale of hydrocarbon generation and boosting in the Qiongzhusi Formation shale in Ziyang Area is 1.3$\sim$1.9 times that of well research, reaching up to 62.80 MPa. Fluid inclusion testing shows a reservoir pressure of 60.00 MPa, which is consistent with this; 3) through the simulation of oil and gas injection dynamics, it was found that the oil and gas in the trough (Ziyang) increased significantly in the early and middle stages of hydrocarbon generation, reaching up to 56.50 MPa, and migrates towards the slope area (Jingyan); in the late stage of hydrocarbon generation, the burial depth of shale increases, the injection resistance increases, and the injection dynamics cannot overcome the resistance. The Jingyan Area is characterized by in-situ organic matter direct cracking for hydrocarbon supply.

Key words: pore connectivity, oil and gas filling, hydrocarbon generation boosting, Qiongzhusi Formation, Jingyan Area

CLC Number:

TE122

SHI Hongliang, DENG Mingquan, ZHOU Hua, HE Jianhua, XU Hao. Pore Connectivity and Oil and Gas Filling Characteristics of Shale Reservoirs in the Qiongzhusi Formation, Southern Sichuan[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2024, 46(6): 74-90.

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