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| 惠民凹陷西部深层断裂样式与古近纪盆地原型的性质 |
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倪金龙1,2,刘俊来1,林玉祥2,王智敏3,韩作振2,李月2,曹淑云4
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(1.中国地质大学 地质过程与矿产资源国家重点实验室,北京 100083;2.山东科技大学 山东省沉积成矿作用与沉积矿产重点实验室,山东 青岛 266510;3.胜利油田 临盘采油厂,山东 临邑 251507;4.Geoscience Centre of the University of Gttingen, Goldschmidtstr 337077, Gttingen, Germany)
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| 摘要: |
| 基于断裂构造形成的力学分析,通过对三维地震数据体的水平切片及剖面的解译、区域构造图的编制,系统研究惠民凹陷西部深层(基底、孔店组-沙四段(Ek-Es4))断裂样式,并对其组合特征、分布规律、活动性质及对古近纪原型盆地形成的影响进行分析,探讨断裂成因、古近纪原型盆地的性质及对油气藏形成的控制作用。结果表明:惠民凹陷西部深层断裂样式可划分为走滑成因断裂样式与伸展成因断裂样式两种类型;基底断裂样式的形成与燕山末期郯庐断裂的左行走滑及鲁西隆起的逆时针旋转趋势相关,孔店组—沙四段沉积期断裂样式与NNW向伸展及郯庐断裂等深大断裂右行走滑作用叠加密切相关;深层断裂样式的特点、分布及沉积特征反映惠民凹陷西部古近纪原型盆地形成过程与走滑作用密切相关,盆地原型应为走滑-伸展型盆地,而非单一的伸展型盆地;深层断裂样式不仅控制了盆地的内部结构,也控制了砂体的分布,并为油气向缓坡带运移提供了通道,从而最终控制了深层油气藏的形成。 |
| 关键词: 断裂样式 盆地原型 惠民凹陷西部 渤海湾盆地 古近纪 |
| DOI：10.3969/j.issn.1673-5005.2011.01.004 |
| 分类号::TE 121.2 |
| 文献标识码:A |
| 基金项目:山东省自然科学基金项目(ZR2009EQ002);山东省沉积成矿作用与沉积矿产重点实验室基金项目(DMSM201005);山东省高等学校优秀青年教师国内访问学者和优秀骨干教师国际合作培养项目;国家自然科学基金项目(90814006) |
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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 |
