A sub-salt structural model of the Kelasu structure in the Kuqa foreland basin,northwest China |
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| Affiliation: | 1. Departamento de Geología, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada BC, Mexico;2. Universidad Autónoma de Baja California, Facultad de Ciencias Marinas, Ensenada BC, Mexico;3. Posgrado de Ciencias de la Tierra, Centro de Investigación Científica y de Educación Superior de Ensenada, Ensenada BC, Mexico;1. Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA, 70803, USA;2. Department of Earth Sciences, University of Hong Kong, Hong Kong, China;3. ISTerre, University Grenoble Alpes, BP53, 38041, Grenoble Cedex 09, France;4. ISTerre, CNRS, BP53, 38041, Grenoble Cedex 09, France;5. PGP, Dept. Geosciences, University of Oslo, Box 1048, Blindern, 0316 Oslo, Norway;6. Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, 14850, USA;7. The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing 100871, China;1. College of Geoscience, China University of Petroleum, Changping, Beijing, 102249, China;2. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Changping, Beijing, 102249, China;3. Tarim Oilfield Company, PetroChina, Korla, Xinjiang, 841000, China;1. Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China;2. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;3. CAS Center for Excellence in the Tibetan Plateau Earth Sciences, China;1. Key Laboratory of Basin Structure and Hydrocarbon Accumulation, CNPC, Beijing 100083, China;2. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, China;3. School of Geosciences, Yangtze University, Wuhan 430100, China;1. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China;2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China;3. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China;4. Department of Geology, University of Leicester, Leicester, LE1 7RH, UK;5. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China |
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| Abstract: | The Kuqa foreland basin, adjacent to the South Tianshan Mountains, is a major hydrocarbon accumulation basin in Western China. The Kelasu structural belt is the focus for hydrocarbon exploration in the basin due to the presence of ramp-related anticline traps and a thick salt seal. The model of the Kelasu sub-salt structure is still contentious because of the structural complexity and poor seismic imaging below the salt layer. The area–depth–strain (ADS) method is applied to the southern part of the Kelasu Fault, a regional fault that cuts basement rocks. The ADS results are consistent with the seismic data, which indicate that both thin-skinned thrusting and basement-involved deformation occur within the Kelasu structure, with the Kelasu Fault acting as the boundary between the two regions of contrasting deformation. The ADS results also suggest that the depth of the lower detachment of the thin-skinned thrust belt is 9.5–10 km, which may correspond to the base of the Triassic. The Kelasu structure has undergone approximately 8.15–10.76 km of horizontal shortening in the east and 16.34 km in the west of the structure. |
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| Keywords: | Area–depth relationship Sedimentary wedge Fold-and-thrust belt Decollement Tarim basin |
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