Structural Evolution of the Eastern Qiulitagh Fold and Thrust Belt,Northern Tarim Basin,China |
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| Authors: | Minghui YANG Zhijun JIN Xiuxiang LU Dongsheng SUN Xuan TANG Gengxin PENG Ganglin LEI |
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| Institution: | 1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249;2. Faculty of Natural Resource and Information Technology, China University of Petroleum, Beijing 102249;3. Exploration and Production Research Institute, SINOPEC, Beijing 100083, China;4. School of Energy, China University of Geosciences, Beijing 100083, China;5. Tarim Oilfield Company, CNPC, Xinjiang 841000, China |
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| Abstract: | The eastern Qiulitagh fold and thrust belt (EQFTB) is part of the active Kuqa fold and thrust belts of the northern Tarim Basin. Seismic reflection profiles have been integrated with surface geologic and drill data to examine the deformation and structure style of the EQFTB, particularly the deformational history of the Dina 2 gas field. Seismic interpretations suggest that Dongqiu 8 is overall a duplex structure developed beneath a passive roof thrust, which generated from a tipline in the Miocene Jidike Formation, and the sole thrust was initiated from the same Jidike Formation evaporite zone that extends westward beneath the Kuqatawu anticline. Dongqiu 5 is a pop‐up structure at the western part of the EQFTB, also developed beneath the Jidike Formation evaporite. Very gentle basement dip and steep dipping topographic slope in the EQFTB suggest that the Jidike Formation salt provides effective decoupling. The strong deformation in the EQFTB appears to have developed further south, in an area where evaporite may be lacking. Since the Pliocene, the EQFTB has moved farther south over the evaporite and reached the Yaken area. Restoring a balanced cross‐section suggests that the minimum shortening across the EQFTB is more than 7800 m. Assuming that this shortening occurred during the 5.3 Ma timespan, the shortening rate is approximately 1.47 mm/year. |
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| Keywords: | Qiulitagh fold and thrust belt Tarim Basin northwestern China |
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