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Ahead of Print Abstract
DOI:10.1306/05032321079
Multi-phase deformation and its impacts on hydrocarbon distribution in the Hetianhe–Madong region, southwestern Tarim Basin
Wei Wang1 , Hongwei Yin1 , Huiwen Xie2 , Dong Jia1 , Bin Wang2 , Gengxiong Yang1 , and Haoyu Luo2
1 School of Earth Science and Engineering, Nanjing University, Nanjing 210046, Jiangsu, China
2 Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, PetroChina, Korla 841000, Xinjiang, China
Ahead of Print Abstract
The Hetianhe–Madong region of the southwestern Tarim Basin contains two thrust systems: the Cenozoic Mazhatage thrust belt in the northwest and the Paleozoic Madong fold-and-thrust belt in the southeast. The two structural belts have almost vertical propagation directions of deformation and abut in a narrow interaction zone between them. Proven hydrocarbons are closely related to the structural deformation experienced in this region and restricted along the fault system of the Mazhatage structure and the narrow interaction zone. Based on seismic interpretations and analog modeling, structural models were constructed in this study for the two thrust systems and the interaction zone. Then, the controlling factors of the restricted distribution of hydrocarbon plays are discussed. The results suggest that the Mazhatage structure is a basement-controlled structure, while the Madong fold-and-thrust belt reflects a thin-skinned structural style with a Middle Cambrian salt as the detachment layer. The interaction zone is controlled by a strike-slip fault, and the pre-existing structures and the salt layer affect its structural geometry. The basement-continued thrust fault and the strike-slip fault of the interaction zone cut through the salt layer, providing conduits for hydrocarbons from subsalt source rocks to suprasalt traps, explaining the restricted hydrocarbon distribution in the Hetianhe–Madong region. This study provides insight into regions undergoing multi-phase deformation and its control on hydrocarbon distribution. The results may be helpful for understanding such structures.
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