Development characteristics and major controlling factors of shale fractures in the Lower Cambrian Niutitang

Miao Fengbin; Peng Zhongqin; Wang Zongxin; Yu Yuning; Ma Yong; Sui Zhiheng

doi:10.19509/j.cnki.dzkq.2020.0204

Volume 39 Issue 2

Mar. 2020

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Miao Fengbin, Peng Zhongqin, Wang Zongxin, Yu Yuning, Ma Yong, Sui Zhiheng. Development characteristics and major controlling factors of shale fractures in the Lower Cambrian Niutitang[J]. Bulletin of Geological Science and Technology, 2020, 39(2): 31-42. doi: 10.19509/j.cnki.dzkq.2020.0204

Citation:

Miao Fengbin, Peng Zhongqin, Wang Zongxin, Yu Yuning, Ma Yong, Sui Zhiheng. Development characteristics and major controlling factors of shale fractures in the Lower Cambrian Niutitang[J]. Bulletin of Geological Science and Technology, 2020, 39(2): 31-42. doi: 10.19509/j.cnki.dzkq.2020.0204

Citation:

Miao Fengbin, Peng Zhongqin, Wang Zongxin, Yu Yuning, Ma Yong, Sui Zhiheng. Development characteristics and major controlling factors of shale fractures in the Lower Cambrian Niutitang[J]. Bulletin of Geological Science and Technology, 2020, 39(2): 31-42. doi: 10.19509/j.cnki.dzkq.2020.0204

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Development characteristics and major controlling factors of shale fractures in the Lower Cambrian Niutitang

doi: 10.19509/j.cnki.dzkq.2020.0204

Received Date: 01 Jul 2019

Abstract

Abstract

Based on outcrop, coring, thin section and the SEM observation and statistics of shale fracture characteristics in the Lower Cambrian Niutitang Formation, western margin of Xuefeng uplift, as well as the corresponding sample analysis test data, this paper analyzes in detail the development characteristics and major controlling factors of shale fracture in Niutitang Formation and the relationship between fracture development and gas content. The results indicate that macro fractures in Niutitang Formation are dominated by structural fractures, such as high dip-angle shearing fractures, low dip-angle slip fractures and some extensional fractures. Structural fractures are mainly formed in 6 stages. Among them the high-angle shear fractures in first stage are mostly developed, and the predominant orientations of fractures are NWW, NNW-near SN and NE directions. The diagenetic fractures are fewer than structural fractures. The micro-fractures mainly include interlayer and bedding fractures. The macro fractures in the core are mostly filled, and the filling degree of the later fractures is lower than that of the earlier fractures. The fracture development is influenced by many factors, such as tectonism, lithology and mineral composition, thickness, organic carbon content, diagenesis and high fluid pressure, among which structural stress and structural position are the main controlling factors. Regional structural stress determines the nature and overall development characteristics of fractures. Local structural stress and structural position make the distribution of fractures different. Fractures are more developed in the structural position with relatively concentrated stress, large stress gradient and strong deformation. In addition, shale with high content of brittle minerals, small thickness of single layer, late diagenetic stage, high content of organic carbon and high fluid pressure has well fracture development.The development of macro fractures and a large number of associated micro-fractures in Niutitang Formation effectively improve the reservoir permeability of shale and thus play an important role in improving gas content.
- fracture,
- development characteristics,
- major controlling factors,
- Niutitang Formation,
- shale gas,
- Xuefeng uplift

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References(34)

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Development characteristics and major controlling factors of shale fractures in the Lower Cambrian Niutitang

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Development characteristics and major controlling factors of shale fractures in the Lower Cambrian Niutitang

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