Relationship between fractures, stress, strike-slip fault and reservoir productivity, China Shunbei oil field, Tarim Bas
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ORIGINAL ARTICLE
Relationship between fractures, stress, strike‑slip fault and reservoir productivity, China Shunbei oil field, Tarim Basin Rui Zhao1 · Teng Zhao1,2 · Qiangfu Kong1 · Shang Deng1 · Huili Li1 Accepted: 20 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract It is becoming widely recognized that a relationship exists between stress, stress heterogeneity, and the permeability of subsurface fractures and faults. We present an analysis of the Shunbei oil gas field, developed mainly in fractured carbonate, where active deformation has partitioned the reservoir into distinct structural and stress domains. These domains have differing geomechanical and structural attributes that control the permeability architecture of the field. The field is a composite of Caledonian contractional elements that have been modified by Hercynian contraction to produce basement-rooted strike-slip faults. Reservoir scale faults were interpreted in detail. Bulk reservoir performance is governed by the local stress architecture that acts on existing faults and their fracture damage zones to alter their permeability and, hence, their access to distributed oil. Reservoir potential is most enhanced in areas that have large numbers of fractures with high ratios of shear to normal stress. This occurs in areas of the field that are in a normal stress style. Comparatively, reservoir potential is lower in areas of the field that are in a strike-slip stress style where fewer fractures with high shear-to-normal stress ratios exist. Achieving the highest well productivity relies on tapping into critically stressed faults and their associated fracture damage zones. One wellbore has been drilled based on this concept, and shows an obvious improvement in petroleum productivity. Keywords Fracture · Stress · Slip tendency · Strike-slip fault · Tarim Basin
Introduction In recent years, hydrocarbon exploration practices around the world have demonstrated that the deep layers of basins (those at depths greater than 4500 m) are likely to contain abundant oil and gas resources (Dyman et al. 2002; Sun et al. 2013; Zhu et al. 2012; Jia and Pang 2015). More than 860 deep-layered oil and gas fields have been discovered globally and contain a total of 115.5 × 108 tons of proven Zhao Rui, who was born in 1988, is working in Research Institute of Exploration & Production, SINOPEC, Beijing. His research orientation is petroleum geology. Zhao Rui and Zhao Teng contributed equally to this work. * Rui Zhao [email protected] 1
Research Institute of Exploration & Production, SINOPEC, No. 267 middle Fourth Ring Road, Haidian District, Beijing 100083, China
School of Energy Resources, China University of Geosciences, Beijing 100083, China
2
oil reserves and 76 × 108 tons of gas. China has also initiated many oil and gas explorations at depths greater than 4500 m. Deep-layered formations, especially carbonate strata, represent the major targets of exploration in the Tarim Basin where several huge oil-fields (containing reserve
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