鄂尔多斯盆地苏203井区奥陶系马家沟组构造特征及其控气性研究

发布时间：2017-12-26 19:46

本文关键词：鄂尔多斯盆地苏203井区奥陶系马家沟组构造特征及其控气性研究　出处：《西安石油大学》2016年硕士论文　论文类型：学位论文

【摘要】：本文以板块构造理论为基础,以含油气盆地整体、动态、综合分析研究为原则,在综合分析前人研究成果基础上,分析处理了区内600余口探井资料,对奥陶系马家沟组古今构造特征及构造演化史进行了研究,从构造演化的角度剖析烃源岩、储集层的分布及演化,圈闭的类型及形态以及运移的路径及方式等,进而总结分析构造演化对天然气成藏的控制作用。通过研究有以下成果及认识:石炭系沉积前,盆地整体呈现西高东低的构造形态,近古隆起区域马家沟组中组合缺失,古隆起东侧自西向东地层逐渐增厚,盆地中部显示为隆凹相间的构造格局;这种构造格局一直延续到二叠纪末期。三叠纪时,受印支运动影响,盆地内部北东向展布的隆凹相间格局完全消失,转而在研究区形成西、北、东三面相对抬升隆起,盆地内部形成向西南开口的凹陷,马五5底面最深处在延安一带。侏罗纪,主要表现为东西分异、其次为南北差异,从而形成了东高西低、北高南低的构造面貌,盆地东部为相对较陡的斜坡,中西部为为凹陷。早白垩末期,盆地总体表现为东高西低、北高南低的面貌,但此时的斜坡和凹陷都变得较为宽缓,凹陷范围也变小,盆地整体面貌与现今相似。早白垩世末燕山晚期运动后,盆地东部抬升,剥蚀部分白垩纪、侏罗纪及三叠纪地层,并逐步形成现今地层东高西低,构造平缓的斜坡构造形态。构造的演化对气藏的分布具有一定的控制作用,主要通过控制气源条件、储集层特征以及圈闭形成和运移路径来实现。加里东运动使马家沟组地层隆起剥蚀,白云岩储集层发育顺层溶蚀作用,形成较长距离的溶蚀孔洞缝,为天然气供了良好的储集空间和运移通道;晚石炭世鄂尔多斯盆地整体沉降,接受上古生界沉积,中组合地层得以与上古生界煤系烃源岩直接接触,形成良好的源储配置关系;早白垩世沉积期,烃源岩达到生烃高峰期,燕山运动造成盆地反转,源储接触关系发生变化,由源上储下型变为源下储上型,天然气沿着溶蚀孔洞缝与晶间孔等形成较长距离的运移通道,在东侧上倾方向的岩性(相)变化处聚集成藏。
[Abstract]:This paper is based on the theory of plate tectonics in petroliferous basin, the overall dynamic and comprehensive analysis of the principle, based on the comprehensive analysis of previous research results, analysis and processing in the area of more than 600 wells data of Ordovician Majiagou Formation in ancient tectonic features and tectonic evolution history was studied, analysis of distribution and evolution of hydrocarbon source rock, reservoir in terms of tectonic evolution, trap type and shape as well as the migration path and methods, and summarizes the evolution analysis of control effect on natural gas reservoir structure. The study has the following results and understanding: the Carboniferous Sedimentary Basin, overall structure from west to East, near the ancient uplift area of Majiagou Formation in the absence of the combination, the paleo uplift gradually thickened from west to east east formation, central basin shows tectonic pattern and tectonic uplift and sag; this pattern has been extended to the at the end of the permian. During the Triassic, by the influence of Indosinian movement, the interphase pattern between the East and the north in the basin disappeared completely. Instead, it formed a relative uplift in the west, North and East three sides in the study area, and formed a depression opening to the southwest in the basin. The deepest part of Ma five 5 bottom was in the Yanan area. The Jurassic is mainly composed of East-West differentiation, followed by North-South differences, thus forming a structural feature of the East, the west, the north and the south. The eastern part of the basin is a relatively steep slope, and the Midwest is a depression. At the end of Early Cretaceous, the basin was characterized by the East, the west, the north and the south, but the slope and sag became wider and slower, and the range of the sag was also smaller. The overall appearance of the basin was similar to that of today. After the late Cretaceous movement in the late Yanshan, the eastern part of the basin was uplifted and denuded by some Cretaceous, Jurassic and Triassic strata, and gradually formed the slope structure form of the east to the west, and the structure to be gentle. The evolution of structure plays a certain role in controlling the distribution of gas reservoirs, mainly through controlling gas source conditions, reservoir characteristics and trap formation and migration path. The Caledonian movement in Majiagou Formation of uplift and denudation, dolomite reservoir bedding dissolution layer development, formation of pores long distance seam, natural gas supply good reservoir space and migration channel; overall settlement of Late Carboniferous Erdos Upper Paleozoic sedimentary basin, accept, in combination with the formation of Upper Paleozoic world coal source rocks in direct contact, the formation of source and reservoir configuration relationships; Early Cretaceous sedimentary period, source rocks reached peak hydrocarbon generation, caused by the movement of Yanshan basin inversion, reservoir contact relationship changes from the source storage type into a source of natural gas along the reservoir, karst cave formation migration long distance channel and intergranular holes, on the east side of the slope lithology (facies) change accumulation.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P618.13

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