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| Style of deep faulting and its control on the Paleogene basin evolved into the western Huimin depression, Eastern China |
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NI Jinlong1,2, LIU Junlai1, LIN Yuxiang2, WANG Zhimin3, HAN Zuozhen2, LI Yue2, CAO Shuyun4
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(1.State Key Laboratory of Geological Processes and Mineral Resources of Ministry of Education, China University of Geosciences, Beijing 100083, China;2.Shandong Provincial Key Laboratory of Depositional Mineralization & Sedimentary Minerals, Shandong University of Science and Technology, Qingdao 266510, China;3.Linpan Oil Production Plant, Shengli Oilfield Company, Linyi 251507, China;4.Geoscience Centre of the University of Gttingen, Goldschmidtstr 337077, Gttingen, Germany)
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| Abstract: |
| Based on the mechanics analysis of fault formation, a systematic study of the fault styles of the deep part of the western Huimin depression, including the basin basement, the Kongdian group (Ek), and the fourth member of the Shahejie group (Es4), was carried out. The main features of faults within the depression, including their distribution, timing of activity, and their influence on the Paleogene basin that evolved into the western Huimin depression, were constrained by interpretations of horizontal slices and crosssections of 3D seismic data, and the analysis of regional tectonic maps. Also the cause of fracture formation, the nature of the Paleogene prototype basin, and the control of faulting on the formation of oilgas reservoirs were considered. The results reveal two types of deep fractures in the western Huimin depression, based on tectonic style:strikeslip and extensional. The formation of basement faults was related to sinistral strikeslip movement along the TanLu fault and counterclockwise rotation of the Luxi uplift during the late Yanshanian, and the fault style during EkEs4 sedimentation was closely related to NNWSSE extension and dextral strikeslip movement upon large deeplevel faults (e.g., the TanLu fault). The distribution and sedimentary characteristics of deeplevel faults indicate that the formation of the Paleogene precursor basin in the western Huimin depression was closely related to strikeslip faulting, suggesting the precursor basin was a transtensional structure rather than a purely extensional structure. The style of deeplevel faults controlled not only the internal structures of the basin, but also the distribution of sandy layers, which provided a pathway of oil and gas migrating toward areas with shallowly dipping beds, thereby ultimately controlled the formation of oil and gas reservoirs. |
| Key words: fault style basin prototype western Huimin depression Bohai Bay Basin Paleogene |
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