The Cretaceous tectonic event in the Qiangtang Basin and its implications for hydrocarbon accumulation |
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Authors: | Yalin Li Chengshan Wang Yongtie Li Chao Ma Licheng Wang Shaonan Peng |
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Affiliation: | 1. State Key Laboratory of Geological Processes and Mineral Resources,Research Center for Tibetan Plateau Geology,China University of Geoscienees,Beijing 100083,China 2. Petroleum Exploration and Development Research Institute,PetroChina,Beijing 100083,China |
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Abstract: | The tectonic event during Cretaceous and its relationship with hydrocarbon accumulation in the Qiangtang Basin is discussed
based on zircon U-Pb dating and the study of deformation, thermochronology and hydrocarbon formation. LA-ICPMS zircon U-Pb
dating indicates that the tectonic event took place during the Early-Late Cretaceous (125–75Ma). The event not only established
the framework and the styles of structural traps in the basin, but also led to the cessation of the first hydrocarbon formation
and the destruction of previous oil pools. The light crude oil in the basin was formed during the second hydrocarbon formation
stage in the Cenozoic, and ancient structural traps formed during the Cretaceous event are promising targets for oil and gas
exploration. |
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Keywords: | Qinghai-Tibet plateau Qiangtang Basin tectonic event Cretaceous hydrocarbon Accumulation |
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