Deformation characteristics of Early Paleozoic marine shale and their influence on the shale gas preservation in the eastern Sichuan-Wulingshan tectonic belt

LI Chunlin; LI Xiaoshi; WANG Zongxiu; LIANG Mingliang; ZHANG Kaixun; TAN Yuanlong; TAO Tao; GAO Li

doi:10.12090/j.issn.1006-6616.2020.26.06.064

Volume 26 Issue 6

Dec. 2020

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Article Navigation > Journal of Geomechanics > 2020 > 26(6): 819-829

LI Chunlin, LI Xiaoshi, WANG Zongxiu, et al., 2020. Deformation characteristics of Early Paleozoic marine shale and their influence on the shale gas preservation in the eastern Sichuan-Wulingshan tectonic belt. Journal of Geomechanics, 26 (6): 819-829. DOI: 10.12090/j.issn.1006-6616.2020.26.06.064

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Deformation characteristics of Early Paleozoic marine shale and their influence on the shale gas preservation in the eastern Sichuan-Wulingshan tectonic belt

doi: 10.12090/j.issn.1006-6616.2020.26.06.064

LI Chunlin^{1, 2, 3
,},
LI Xiaoshi^{1, 2, 3},
WANG Zongxiu^{1, 2, 3
,
,},
LIANG Mingliang^{1, 2, 3},
ZHANG Kaixun^{1, 2, 3},
TAN Yuanlong^{1, 2, 3},
TAO Tao¹,
GAO Li⁴

1.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
2.
Key Lab of Shale Oil and Gas Geological Survey, Chinese Academy of Geological Sciences, Beijing 100081, China
3.
Key Laboratory of Petroleum Geomechanics, China Geological Survey, Beijing 100081, China
4.
Beijing Institute of Geological Survey, Beijing 102206, China

More Information

Received: 2020-09-15
Revised: 2020-11-04
Published: 2020-12-01

Abstract

Abstract

Two sets of marine shale systems (the Lower Cambrian Niutitang Formation and the Upper Ordovician Wufeng-Lower Silurian Longmaxi Formations) developed in the Lower Paleozoic of the eastern Sichuan-Wuling tectonic belt are not only significant decollement zones,but also key strata for shale gas exploration and development. In this paper,through detailed field structural analysis (macroscopic scale) and indoor microscopic observation (microscopic scale),it is considered that there are at least two stages of structural deformation developed in shale: top-to-the-NW/SE thrusting (D₁) and the faults cutting through the bedding (D₂). The deformation and strength characteristics of shale are related to the change of distance from the regional fault zones. The deformation characteristics of shale far away from the fault zone are mainly manifested as nearly vertical microcracks,belonging to the brittle domain; near the fault zone,the deformation characteristics of shale gradually show brittle-to-ductile transition and the development of mylonitization structures; within the fault zone,strongly foliated and mylonitization structures developed in the shale indicating the deformation of shale belongs to the ductile domain. By means of ion-milled backscatter SEM,the pore-structure evolution characteristics of deformed shale were analyzed. The result showed that not only the pore types in shale can be transformed,the size and distribution characteristics of pores can also change with the deformation strength. On this basis,the influence of Lower Paleozoic shale deformation on shale gas preservation in the complex structural area of South China is further discussed. It is suggested that the D₁ can change the pore system developed in the shale,which is conducive to shale gas enrichment. The extension or strike-slip shearing (D₂) can not only destroy the oil and gas traps formed previously,but also cause oil and gas migration from the high potential zone to the low potential zone along the fault zone,thus leading to oil and gas loss.
- shale decollement deformation,
- enrichment and preservation of shale gas,
- Lower Paleozoic,
- eastern Sichuan-Wulingshan tectonic belt

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Deformation characteristics of Early Paleozoic marine shale and their influence on the shale gas preservation in the eastern Sichuan-Wulingshan tectonic belt

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Deformation characteristics of Early Paleozoic marine shale and their influence on the shale gas preservation in the eastern Sichuan-Wulingshan tectonic belt

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