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DOI:10.1306/07122422055
Buried rift basin under the Kalpin fold-thrust belt in the northwestern Tarim Basin: Implications for deep oil and gas exploration
Cheng Zhong1 , Tongsheng Zeng2 , Chengzao Jia2 , Guoqi Wei2 , Dong Jia1 , Yongjin Zhu2 , Hongwei Yin1 , Zhuxin Chen2 , Xing Wang2 , and Yong Zhang3
1 State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023,China
2 PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China
3 State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China
Ahead of Print Abstract
Older rift basins, which were deeply buried and reworked by advancing fold-thrust belts, offer potential opportunities for hydrocarbon accumulation, but capturing and defining them can be challenging. This study employs reprocessed two-dimensional seismic datasets, offering unprecedented insight into a buried Neoproterozoic rift basin within the Cenozoic Kalpin fold-thrust belt (KFTB). The results reveal a Neoproterozoic rift basin characterized by strong, dipping reflectors at its base and multiple unconformable reflection interfaces at its top, outlining the syn-rift wedge. The rift and its associated faults predominantly exhibit east-west and northeast trends, suggesting a potential linkage to the northern rift system in the Tarim Basin. Additionally, several anticlines, driven by the uplift of lower Cambrian strong reflectors above the regional elevation, are identified as rift inversion structures formed after the overlying thin-skinned deformation. Consequently, the structural style of the KFTB is redefined as Cenozoic thin-skinned tectonics involving Neoproterozoic rift inversion. This redefinition highlights several significant structural traps beneath the thrust sheets. These buried structures under the thrust nappes shed new light on deep hydrocarbon resources, encouraging a renewed assessment and unlocking the exploration potential of fold-thrust belts.
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