Quantitative Characterization of Shale Micro-fracture in the Yuanba Area of the Sichuan Basin by Micro X-ray Tomography

Lei LI; Jing-yu HAO; Ji-lin XIAO; Ping-ping LI; Zheng-chen ZHANG; Hua-yao ZOU

doi:10.15898/j.cnki.11-2131/td.202001150011

2020 Vol. 39, No. 3

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Lei LI, Jing-yu HAO, Ji-lin XIAO, Ping-ping LI, Zheng-chen ZHANG, Hua-yao ZOU. Quantitative Characterization of Shale Micro-fracture in the Yuanba Area of the Sichuan Basin by Micro X-ray Tomography[J]. Rock and Mineral Analysis, 2020, 39(3): 362-372. doi: 10.15898/j.cnki.11-2131/td.202001150011

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Lei LI, Jing-yu HAO, Ji-lin XIAO, Ping-ping LI, Zheng-chen ZHANG, Hua-yao ZOU. Quantitative Characterization of Shale Micro-fracture in the Yuanba Area of the Sichuan Basin by Micro X-ray Tomography[J]. Rock and Mineral Analysis, 2020, 39(3): 362-372. doi: 10.15898/j.cnki.11-2131/td.202001150011

Quantitative Characterization of Shale Micro-fracture in the Yuanba Area of the Sichuan Basin by Micro X-ray Tomography

1.
College of Geosciences, China University of Petroleum, Beijing 102249, China
2.
Exploration Company of China Petroleum & Chemical Corporation, Chengdu 610041, China

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Corresponding author: Jing-yu HAO, 83962253@qq.com

Received Date: 15 January 2020

Revised Date: 16 February 2020

Accepted Date: 16 April 2020

Abstract

Abstract

BACKGROUNDQuantitative study of micro-fracture in shale is conducive to understanding reservoir type and evaluating the shale gas exploration potential. Micrometer X-ray tomography (micro-CT) is currently the most direct way to observe and measure micro-fracture. OBJECTIVESTo qualitatively and quantitatively characterize the micro-fracture in the shale of the Da'anzhai Member of the Yuanba area of the Sichuan Basin, and to evaluate the exploration potential of shale gas. METHODSMicro-CT technology was used, through the identification and statistics of micro-fracture on the micrometer CT two-dimensional image. The micro-fracture porosity of shale samples was calculated quantitatively. Combined with the total porosity of shale samples obtained by porosimetry, the proportion of micro-fracture in the total pore space of shale was quantitatively evaluated. RESULTSThe micro-fracture in shale were mainly structural micro-fracture with the width of 0-12μm. They were layered in three-dimensional space. The total porosity of shale was 2.24%-4.60% (average 3.48%), in which the micro-fracture porosity was 0.25%-1.06% (average 0.82%), accounting for an average of 23.28% in the total pore space. The development degree of micro-fracture was similar to that of the marine Longmaxi Shale in the Jiaoshiba area of the Sichuan Basin with the average micro-fracture porosity of 0.3%-1.3% that accounted for 6.1%-22.4% of the total porosity. The shale in the Da'anzhai Member of the Yuanba area was a pore-type reservoir with abundant nano-scale matrix pores, which was conducive to the enrichment of shale gas. Meanwhile, the development of micro-fracture can communicate with many isolated matrix pores, which was conducive to high shale gas production. CONCLUSIONSThe shale in the Da'anzhai Member of the Yuanba area is a pore-type reservoir with widespread micro-fracture, indicating that the area has high and stable shale gas pore conditions and good exploration potential.
- micro X-ray tomography /
- micro-fracture /
- quantitative characterization /
- Yuanba area /
- Da'anzhai Member /
- shale

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