Thermal and maturation history of Jurassic source rocks in the Kuqa foreland depression of Tarim Basin,NW China |
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| Institution: | 1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. CNOOC Research Institute, Beijing 100027, China;1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. Department of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China;3. Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;4. Tarim Oil-field Company, PetroChina, Korla 841000, China;1. Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources, Laboratory of Isotope Thermochronology, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China;2. Research Institute of Petroleum Exploration and Development, Tarim Oilfield Company, Korla, Xinjiang, 841000, China;1. PetroChina Hangzhou Institute of Geology, Hangzhou 310023, China;2. Key Laboratory of Carbonates, CNPC, Hangzhou 310023, China;3. PetroChina Tarim Oilfield Company, Korla 841000, China;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Earth Sciences, The University of Melbourne, Victoria 3010, Australia;4. CAS Center for Excellence in Tibetan Plateau Earth Sciences, China;5. State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210093, China;6. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;1. Exploration and Development Research Institute, PetroChina Tarim Oilfield Company, Xinjiang, 841000, China;2. College of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu, 610000, China |
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| Abstract: | Kuqa foreland depression of the Tarim Basin is one of the largest gas production provinces in China. Thermal history reconstruction using vitrinite reflectance data indicates that the palaeo-heat flow in Kuqa depression was relatively high (50–55 mW/m2) during the Mesozoic, but gradually decreased during the Cenozoic to reach the present value of 40–50 mW/m2. The cooling of the Kuqa depression is probably attributed to the crust thickening and the rapid sedimentary rate. The Jurassic source rocks entered conventional oil window at 100 Ma, and began to generate gas at approximately 75 Ma in the Kelasu area. Thermal maturation of the Jurassic source rocks accelerated significantly since 23.3 Ma, especially in the recent 5.2 Ma. In this foreland depression, source rock maturation, which is likely controlled mainly by burial history, also influenced by the presence of fault thrusting and salt-bearing formations. |
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| Keywords: | Kuqa foreland depression Thermal history Source rock maturation Thrust-faulting Salt-bearing strata |
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