Geology-engineering integration to improve drilling speed and safety in ultra-deep clastic reservoirs of the Qiulitage structural belt

Chen, Changchang; Ji, Guodong; Wang, Haige; Huang, Hong Hai; Baud, Patrick; Wu, Qiang

doi:10.46690/ager.2022.04.09

Cited by 5 publications

(1 citation statement)

References 16 publications

(16 reference statements)

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“…In the Ordos Basin, due to the influences of sedimentation, diagenesis and tectonism, the heterogeneity of low-permeability reservoirs is strong, and natural fracture development is affected by lithology, thickness and rock mechanics parameters (Zhao et al, 2014;Ju et al, 2017). Natural fractures control the seepage systems of low-permeability reservoirs, thus affecting the deployment of low-permeability oilfield development plans and their development (Zeng et al, 2007;Zeng et al, 2008a;Zeng and Li, 2009;Ju et al, 2015;Zhao and Hou, 2017a;Liu et al, 2022a;Chen et al, 2022). Therefore, studying the orientations of natural fractures and the factors that influence fracture orientation is very important for the deployment of an injection-production well pattern, the direction of water seepage in the reservoir, and the formulation of a reasonable development plan.…”

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confidence: 99%

Development or absence of conjugate fractures in low-permeability sandstones

Yang

Chen

et al. 2023

Front. Earth Sci.

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Natural fractures are ubiquitous in rocks. The Coulomb law of Mohr’s failure theory predicts that the angle between conjugate failure surfaces is a constant. In the Ordos Basin, observing the development of two groups of conjugate fractures in the field, cores and imaging logging is very difficult. In this paper, the directions of paleocurrents in the Upper Triassic Yanchang Formation of the Ordos Basin are determined by measuring the orientations of field bedding. Through the correlation analysis of paleocurrent and natural fracture orientations, when the sediment comes from a single source, a group of fractures with a large angle between conjugate fractures and the paleocurrent direction is found not to develop. When the sediments in the study area have two provenances, both provenance directions affect the development of conjugate fractures. In the southern Ordos Basin, influenced by the direction of paleocurrent flow in the near-north direction, fractures in the near N‒S direction develop. Through rock mechanics experiments in different directions, the planar anisotropy in rock mechanics parameters caused by the direction of paleocurrent flow is found to be the geological factor leading to various degrees of fracture development in different directions within the Ordos Basin.

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