富有机质页岩天然裂缝研究进展

曾联波; 马诗杰; 田鹤; 薛萌; 刘国平; 吕文雅

doi:10.3799/dqkx.2022.190

Volume 48 Issue 7

Jul. 2023

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Article Navigation > Earth Science > 2023 > 48(7): 2427-2442

Zeng Lianbo, Ma Shijie, Tian He, Xue Meng, Liu Guoping, Lü Wenya, 2023. Research Progress of Natural Fractures in Organic Rich Shale. Earth Science, 48(7): 2427-2442. doi: 10.3799/dqkx.2022.190

Citation:

Zeng Lianbo, Ma Shijie, Tian He, Xue Meng, Liu Guoping, Lü Wenya, 2023. Research Progress of Natural Fractures in Organic Rich Shale. Earth Science, 48(7): 2427-2442. doi: 10.3799/dqkx.2022.190

Zeng Lianbo, Ma Shijie, Tian He, Xue Meng, Liu Guoping, Lü Wenya, 2023. Research Progress of Natural Fractures in Organic Rich Shale. Earth Science, 48(7): 2427-2442. doi: 10.3799/dqkx.2022.190

Citation:

Zeng Lianbo, Ma Shijie, Tian He, Xue Meng, Liu Guoping, Lü Wenya, 2023. Research Progress of Natural Fractures in Organic Rich Shale. Earth Science, 48(7): 2427-2442. doi: 10.3799/dqkx.2022.190

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Research Progress of Natural Fractures in Organic Rich Shale

doi: 10.3799/dqkx.2022.190

Zeng Lianbo^{1, 2
,
,},
Ma Shijie¹,
Tian He¹,
Xue Meng¹,
Liu Guoping^{2, 1},
Lü Wenya^{1, 2}

1.
School of Earth Sciences, China University of Petroleum (Beijing), Beijing 102249, China
2.
Institute of Energy, Peking University, Beijing 100871, China

Received Date: 2021-12-31
Publish Date: 2023-07-25

Abstract

Abstract

Natural fracture is an important reservoir space and main seepage channel of organic rich shale oil and gas reservoir, which affects the enrichment, preservation, single well productivity and development effect of shale oil and gas. The research on the development law of natural fracture is of great significance to the exploration and development of organic rich shale oil and gas. Based on the research results of marine and continental organic rich shale fractures in recent years, this paper summarizes the latest progress in the genetic types, development characteristics, main control factors, evaluation and prediction methods of organic rich shale natural fractures, and finally discusses the key research directions of organic rich shale natural fractures in the future. The natural fractures of organic rich shale can be divided into three categories and six sub categories: tectonic fractures, diagenetic fractures and abnormally high-pressure-related fractures. The main fracture types are intraformational open fractures, transformational shear fractures, bed-parallel shear fractures and bed-parallel lamellated fractures. The development degree of shale tectonic fractures is mainly controlled by brittle mineral content, organic matter content, high brittle shale layer thickness, structure, formation dip angle and fluid pressure. The formation and development of bed-parallel lamellated fractures are mainly affected by organic matter content, lamina type, lamina number, lamina thickness and later tectonic uplift. Due to the differences in mineral composition, lithofacies changes and thermal evolution of organic matter caused by different sedimentary environments between continental shale and marine shale, the development characteristics of fractures between continental shale and marine shale are obviously different. Compared with marine shale fractures, the distribution pattern of continental shale fractures is more complex, the scale of tectonic fractures is smaller, and the development degree of cross layer shear fractures and bedding shear fractures is low. At present, the evaluation and prediction of shale fractures are mainly carried out with the help of the existing conventional research methods of tectonic fractures in low-permeability tight reservoirs. How to combine geology, geophysics and machine learning to form a classification evaluation and prediction method suitable for different scales and types of shale fractures according to the characteristics of small scale of shale fractures and development of bed-parallel lamellated fractures, It is very important to improve the evaluation and prediction accuracy of shale fractures and better guide oil and gas development. The development law of deep organic rich shale fractures, the influence of natural fractures on hydraulic fracturing fractures, and the three-dimensional geological modeling of complex fracture network system integrating multi-scale, multi occurrence and multi Genesis shale fractures will also be important problems to be solved in the research of shale fractures in the future.
- tectonic fracture,
- bed-parallel lamellated fracture,
- developmental characteristic,
- main control factor,
- marine shale,
- continental shale,
- petroleum geology

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References(74)

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