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| Cenozoic structural deformation in the Yuqia-Jiulongshan region, northern Qaidam Basin, China |
| CHEN Siyuan1,2, ZHANG Yongshu3, WU Lei1,2, ZHANG Junyong4, WANG Liqun3, XIAO Ancheng1,2, SHEN Ya4 |
1. School of Earth Science, Zhejiang University, Hangzhou 310012, China;
2. Research Center for Structures in Oil & Gas Bearing Basins, Hangzhou 310012, China;
3. Exploration & Development Research Institute of Qinghai Oilfield Company, PetroChina, Dunhuang 736202, China;
4. GRI, BGP Inc., CNPC, Zhuozhou 072751, China |
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Abstract Based on field geological survey, interpretation of seismic reflection profile and thermochronology dating, this paper systematically studied the structural deformation of the Yuqia-Jiulongshan region in northern Qaidam Basin during the Cenozoic. The results show that the area is primarily dominated by a large box-shaped anticline, with steep limbs and a wide and gently-deformed core. The Mahaigaxiu and Jiulongshan anticlines are secondary folds controlled by secondary faults in the limbs of the box-shaped anticline. Whereas the Yuqia and the Northern Yuqia anticlines are secondary folds within the wide core of the box-shaped anticline. The geometry of the box-shaped anticline is mainly controlled by some high-angle reverse faults with certain right-lateral strike-slip components, displaying distinct positive flower structures in section view. Combining the sedimentary correlation and detrital apatite fission track analysis, we believe that the Yuqia-Jiulongshan region was a paleo-uplift that developed slightly in the early Cenozoic, resulting in the relatively thin Cenozoic strata. The intense deformation that shaped the present-day structural framework occurred in or after the sedimentary period of Shizigou Formation. The Yuqia - Jiulongshan paleo-uplift is adjacent to the Sainan depression that is rich in Lower-Middle Jurassic source rocks, and thus has high potential for future hydrocarbon exploration.
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Received: 14 May 2019
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