THE INFLUENCE MECHANISM OF FILLED NATURAL FRACTURES ON THE VARIATION LAW OF SHALE PERMEABILITY IN LOADING PROCESS

SHANG Chunjiang; KANG Yongshang; DENG Ze; ZHAO Qun; WANG Hongyan; LIU Honglin

doi:10.12090/j.issn.1006-6616.2019.25.03.035

Volume 25 Issue 3

Jun. 2019

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SHANG Chunjiang, KANG Yongshang, DENG Ze, et al., 2019. THE INFLUENCE MECHANISM OF FILLED NATURAL FRACTURES ON THE VARIATION LAW OF SHALE PERMEABILITY IN LOADING PROCESS. Journal of Geomechanics, 25 (3): 382-391. DOI: 10.12090/j.issn.1006-6616.2019.25.03.035

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THE INFLUENCE MECHANISM OF FILLED NATURAL FRACTURES ON THE VARIATION LAW OF SHALE PERMEABILITY IN LOADING PROCESS

doi: 10.12090/j.issn.1006-6616.2019.25.03.035

1.
School of Geosciences, China University of Petroleum, Beijing 102249, China
2.
State Key Laboratory of Petroleum Resources and Prospecting, Beijing 102249, China
3.
Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

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Received: 2018-06-11
Revised: 2018-08-29
Published: 2019-06-01

Abstract

Abstract

Shale gas exploitation requires large-scale artificial hydraulic fracturing of resevoirs. In order to study the variation law and mechanism of shale permeability during fracturing, fluid-solid coupling physical simulation experiments on two shale samples with and without filled natural fractures were carried out, and combined with the analysis of whole-rock X-ray diffraction of two samples, the following understandings were obtained:(1) During the loading and unloading process, the presence of small stress platforms in the stress-strain curve indicate the formation and closure of micro-fractures in the sample, which is the intrinsic mechanism of permeability change; (2) When the shale sample reaches the fracture condition to form visible fractures, the sample will be permanently deformed to increase the permeability. (3) In the process of loading, micro-fractures tend to develop along the fragile surface of natural fractures and continuously accumulate to form fracture networks, which is the mechanism for the difference of permeability changes between two shale samples.
- shale gas,
- fluid-solid coupling,
- permeability,
- natural fracture,
- formation mechanism

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THE INFLUENCE MECHANISM OF FILLED NATURAL FRACTURES ON THE VARIATION LAW OF SHALE PERMEABILITY IN LOADING PROCESS

doi: 10.12090/j.issn.1006-6616.2019.25.03.035

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THE INFLUENCE MECHANISM OF FILLED NATURAL FRACTURES ON THE VARIATION LAW OF SHALE PERMEABILITY IN LOADING PROCESS

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