Oil & Gas Geology ›› 2023, Vol. 44 ›› Issue (2): 321-334.doi: 10.11743/ogg20230206

• Petroleum Geology • Previous Articles     Next Articles

Development characteristics and evolution mechanism of the uplifted segment of the No. 5 strike-slip fault zone in Shunbei area, Tarim Basin

Hongbo ZHANG1,2(), Yushuang ZHOU1,2(), Xuguang SHA3, Shang DENG2, Xiangcun SHEN3, Zhongzheng JIANG3   

  1. 1.Wuxi Research Institute of Petroleum Geology,Petroleum Exploration and Production Research Institute,SINOPEC,Wuxi,Jiangsu 214126,China
    2.Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 102206,China
    3.Research Institute of Exploration and Development,Northwest Oilfield Company,SINOPEC,Urumqi,Xinjiang 830011,China
  • Received:2022-12-14 Revised:2023-01-10 Online:2023-03-17 Published:2023-03-17
  • Contact: Yushuang ZHOU E-mail:zhanghb7960.syky@sinopec.com;zhouys.syky@sinopec.com

Abstract:

The No. 5 fault zone in Shunbei area, a main strike-slip fault zone running through two paleo-uplifts and being devided into north, middle, south and uplifted segments, has always been the focus of research on the formation and evolution of the strike-slip fault system in Shunbei area and its surroundings. In this study, the latest high-precision 3D seismic data newly acquired and processed are applied to carry out the fine analysis of the uplifted segment of the No. 5 fault zone in Shunbei area, determining its geometric and kinematic characteristics and revealing its formation and evolution process. According to the change of strike angle and segmented deformation pattern, the uplifted segment of the study area can be divided into three sections: the north translational section (NE16°)(uplifted segementⅠ), the middle pull-apart section (NE19°)(uplifted segment Ⅱ), and the south compressional-uplifted section (NE25°)(uplifted segment Ⅲ). The uplifted segment in the study area develops a layered deformation pattern composed of high and steep strike-slip faults and multiple suites of en echelon normal faults from bottom to top, while undergoing multi-stage strike-slip activities during the Middle Caledonian, Late Caledonian, Middle-to-Late Hercynian and Indosinian-Early Himalayan periods. In the study area, the strike-slip activities feature “strong in the segments Ⅱ and Ⅲ, weak in the segment Ⅰ”. Under the influence of stress transmission from south to north, the south and uplifted segments present sinistral strike-slip from south to north with No. 1 fault zone in Tazhong area as the boundary at the initial stage of development, while the north and middle segments present dextral strike-slip from north to south, with the maximum principal stress deflecting from NW to NE. After the Late Caledonian period, the No. 5 fault zone in Shunbei area presented sinistral strike-slip as a whole, while during the Indosinian-Early Himalayan periods, the uplifted segment reversed to dextral strike-slip, with the maximum principal stress reversing from NW to NE.

Key words: deformation pattern, strike-slip fault zone, tectonic evolution, Tazhong uplift, Shunbei area, Tarim Basin

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