辽中凹陷及其邻区构造样式特征及其与油气的关系

发布时间：2018-06-12 22:56

本文选题：辽中凹陷 + 构造样式　；参考：《成都理工大学》2015年硕士论文

【摘要】：本文以区域地质、地震和钻井资料为基础,从地震资料构造解释入手,结合前人研究成果,对辽中凹陷主干断裂带的结构特征和演化特征进行了深入研究,总结了辽中凹陷及其邻区构造样式特征,并分析了各种类型构造样式的成因。最后结合油气成藏要素,分析了构造样式与油气的关系。辽中凹陷主干断裂带控制了辽中凹陷整体构造格局,并将辽中凹陷及其邻区分为东部凸起带、中部凹陷带以及西部凸起带。辽中1号断裂带从南向北贯穿了整个辽中凹陷,沿着走向方向断裂性质有差异,主要表现为伸展性质,走滑性质,伸展-走滑叠加复合性质。辽中2号断裂带发育在辽中凹陷的北部,主要表现为走滑性质,沿走向方向断裂的倾向有差异,表现了走滑断裂的丝带效应。辽西3号断裂带主要发育在辽东湾北部地区,整体表现为伸展性的正断层。辽中凹陷及其邻区发育的构造样式主要有伸展构造样式、走滑构造样式、伸展-走滑叠加复合构造样式,局部地区在断裂的作用下伴生底辟构造样式和反转构造样式。辽中凹陷主干断裂带的主要活动期次为:①强烈伸展活动期:孔店组到沙河街组三段沉积时期,辽中1号断裂、辽中2号断裂和辽西3号断裂均表现为伸展活动;②右旋走滑活动期:东营组三段和东营组二沉积期,在郯庐断裂带右旋走滑作用下,三条主干断裂带在不同程度上均遭受到了利用和改造。③反转活动期:东营组一段沉积末期,盆地发生区域性抬升导致局部地区断裂发生反转活动。④弱走滑-伸展活动期:馆陶组-平原组沉积期,辽中1号断裂和辽中2号断裂整体上表现为较弱的走滑活动,辽西3号断裂表现为较弱的伸展活动或者静止。辽中凹陷主干断裂带伸展和走滑活动形成了多种类型的构造样式,从而导致了圈闭的多样性,其中深层圈闭的形成与断裂的伸展活动相关,浅层圈闭的形成与断裂的走滑活动相关。辽中凹陷主干断裂带沟通了下部的烃源岩和上部的圈闭,可以作为油气垂向的运移通道。
[Abstract]:Based on the regional geological, seismic and drilling data, the structural and evolutionary characteristics of the main fault zone in the central Liaoning sag are studied in this paper, starting with the structural interpretation of the seismic data and combining with the previous research results. This paper summarizes the structural style characteristics of the central Liaoning sag and its adjacent areas, and analyzes the genesis of various types of structural styles. Finally, the relationship between structural style and oil and gas is analyzed in combination with oil and gas accumulation elements. The main fault zone of the central Liaoning sag controls the whole tectonic structure of the central depression, and divides the central depression and its neighbors into the eastern uplift zone, the central sag zone and the western uplift zone. Liaozhong No. 1 fault zone runs through the whole Liaozhong sag from south to north, and the fault properties along the strike direction are different, mainly showing extensional property, strike-slip property, extension-strike-slip superposition property. The No. 2 fault zone of Liaozhong developed in the northern part of Liaozhong sag, which is mainly characterized by strike-slip, and the tendency of faults along strike direction is different, which shows the ribbon effect of strike-slip fault. The No. 3 fault zone in western Liaoning is mainly developed in the northern part of Liaodong Bay, which is an extensional normal fault. The structural styles developed in the central Liaoning sag and its adjacent areas mainly include extensional structural style, strike-slip structural style, extension-strike-slip superimposed composite structural style, and the diapir structural style and reverse structural style associated with the fault in the local area. The main active stage of the main fault zone in the central Liaoning sag is the stage of strong extensional activity: the third member sedimentary period from Kongdian formation to Shahejie formation, Liaozhong No. 1 fault, Liaozhong No. 2 fault and Liaoxi No. 3 fault all show extensional activity; (2) dextral strike-slip activity: the third member of Dongying formation and the second sedimentary period of Dongying formation, under the action of right-lateral strike-slip in the Tanlu fault zone, The three main fault zones were all subjected to the reverse activity period of utilization and transformation in varying degrees: the end of the first member of the Dongying formation, the late depositional period of the first member of the Dongying formation, The occurrence of regional uplift in the basin leads to the inversion of fault activities in the local area. 4. The weak strike slip and extensional period: the sedimentary period of Guantao formation and plain formation, and the faults of Liaozhong 1 and Liaozhong 2 show weaker strike-slip activities as a whole. Fault No. 3 in western Liaoning shows weak extensional activity or quiescence. The extension and strike-slip activities of the main fault zone in the central Liaoning sag have formed many types of structural styles, resulting in the diversity of traps, in which the formation of deep traps is related to the extensional activities of the faults. The formation of shallow traps is related to the strike-slip activity of faults. The main fault zone in the central Liaoning sag connects the lower source rock with the upper trap and can be used as the vertical migration channel of oil and gas.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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