Description of the reservoir along strike-slip fault zones in China T-Sh oilfield, Tarim Basin
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ORIGINAL ARTICLE
Description of the reservoir along strike‑slip fault zones in China T‑Sh oilfield, Tarim Basin Rui Zhao1,2 · Shang Deng1,2 · Lu Yun2 · Huixi Lin1,2 · Teng Zhao1,2,3 · Chen Yu1,2 · Qiangfu Kong1,2 · Qiang Wang1,2 · Huili Li1,2 Accepted: 12 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The reservoir depth of T-Sh oilfield in Tarim Basin is more than 7500 m, which is a typical deep carbonate fault-controlled reservoir. The S-1 and S-5 fault zones experienced multi-stage tectonic movements and developed complex fault-fracture systems. Based on geometry and dynamics, the evolution characteristics of faults are analyzed; the permeability of strike-slip faults in the middle and lower Ordovician carbonate strata drilled through in S-5 fault zone is studied by comprehensively using core observation, imaging logging, 3D seismic data, and drilling historical data, taking wells F-1 and F-10 as examples. It is found that the fault-fracture system is the main reservoir space and fluid migration channel in the reservoir. A large mud loss will occur when drilling high permeability faults. High production can be obtained after conventional well completion, otherwise, it is difficult to get production. In this paper, slip tendency coefficient is used to quantitatively characterize the permeability of fractures in T-SH ultra-deep reservoir. Based on the one-dimensional geomechanical model and threedimensional geological structure model of typical wells, the slip tendency coefficients of different parts of the fault-fracture system are calculated using finite element numerical simulation method. Compared with the historical data of drilling in S-1 and S-5 fault zones, it is found that the slip tendency coefficient is positively correlated with mud loss. The results show that the critical slip tendency coefficient of the S-5 fault zone is 0.3, and that of the S-1 fault zone is 0.2. This study provides a new idea and method for the prediction of geological desserts and well trajectory design in the T-Sh reservoir. Keywords Tarim Basin · T-Sh reservoir · The fault-fracture system · Slip tendency
Introduction The large faults which vertically connect the source and reservoir formations are the main space for hydrocarbon storage and flow channels. Generally, the fault zone is composed of the fault core and damage zone. In high strain areas of the Zhao Rui and Deng Shang authors have 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
2
Sinopec Northwest Oilfield Company, Ürümqi 830011, Xinjiang, China
3
School of Energy Resources, China University of Geosciences, Beijing 100083, China
faults, fault gouge, breccias, cataclasites, and ultra-cataclasites are often associated (Aydin 1978; Caine et al. 1996; Chester et al. 1993; Kim and Dreger 2008; Scholz 1987; Sibson 1977). In the damage zone, due to the influence of fault structur
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