辽东湾坳陷辽西低凸起输导体系研究

发布时间：2018-12-27 21:03

【摘要】：本文在充分调研整理研究区前人研究成果以及已有基础资料的基础上,对辽东湾坳陷辽西低凸起的油气输导体系进行系统分析,并结合区内油气藏的类型、分布以及形成过程,建立不同构造区的油气运聚成藏模式。研究区烃源条件充足,纵向上发育两套储盖组合,油气主要分布在东营组,沙河街组次之,主要发育与断层有关的构造油气藏。该区断裂广泛发育,辽西1号、辽西2号和辽西3号三条基底大断裂以及频繁活动的浅层断裂,构成了研究区最重要的油气输导通道;区内骨架砂体发育良好,尤其以沙一、沙二段和东二段最为突出,这些砂体总体孔渗性好,具有良好的流体输导能力和储集性能。控凹主断层与东营组河流相、三角洲相储集体的有机结合,为两侧生烃凹陷中的油气向低凸起的运移提供了有利的通道。研究表明,研究区内每个独立的输导要素都具有良好的输导性能,不同输导要素的组合配置大大提高了其对油气的输导能力。总的来说,研究区输导格架以断层—砂体—不整合面-砂体-断层-砂体的复合体系为主。走向近NE的基底大断裂、东营组的厚层砂岩储层以及研究区广泛发育的不整合是形成本区最佳输导体系配置的基本要素。合理的输导格架为凹陷中生成的油气在垂向和侧向运移进而在浅层成藏提供了通道保障,因此使斜坡带和凸起区形成了一大批高产油气田。通过对低凸起上自北向南的JZ20-2、JZ25-1S以及SZ36-1三个主要含油气构造的研究表明,研究区油气主要来源于辽中凹陷,且基本上为晚期成藏。由于构造背景和沉积条件的差异,以及输导要素配置的不同,各个油气区形成了不同的油气运聚成藏模式。
[Abstract]:On the basis of thorough investigation and collation of previous research results and existing basic data, this paper makes a systematic analysis of the oil and gas transport systems in the low uplift of the western Liaoning Province in the Liaodong Bay Depression, and combines the types, distribution and formation process of the oil and gas reservoirs in the area. The oil and gas migration and accumulation model of different structural areas is established. In the study area, there are sufficient hydrocarbon source conditions and two sets of reservoir cap assemblages are developed longitudinally. Oil and gas are mainly distributed in Dongying formation, followed by Shahejie formation, and mainly developed structural reservoirs related to faults. The faults of Liaoxi No. 1, No. 2 and No. 3 of Liaoxi, as well as the frequently active shallow faults, form the most important petroleum channel in the study area. The skeleton sand bodies are well developed in the area, especially in the first, second and eastern parts of the sand body. These sand bodies have good overall porosity and permeability, and have good fluid transport capacity and reservoir performance. The organic combination of the main fault of the control depression with the fluvial facies and the delta facies of Dongying formation provides a favorable channel for the migration of oil and gas to the low uplift in the hydrocarbon generating sag on both sides. The results show that each independent transport element in the study area has good transport performance, and the combination of different transport elements greatly improves its ability to transport oil and gas. Generally speaking, the main transport framework in the study area is the composite system of fault-sand body-unconformity surface-sand body-fault-sand body. The strike near the basement of NE, the thick sandstone reservoir of Dongying formation and the widespread unconformity in the study area are the basic elements to form the best transportation system configuration in this area. A reasonable transport grid provides a channel guarantee for the vertical and lateral migration of the oil and gas generated in the sag and then for the formation of shallow reservoirs. Therefore, a large number of high-yielding oil and gas fields have been formed in the slope zone and the uplift area. Through the study of three main oil-bearing structures, JZ20-2,JZ25-1S and SZ36-1, from north to south of the low uplift, it is shown that the oil and gas in the study area mainly originate from the central Liaoning sag and are basically late oil and gas accumulation. Because of the difference of tectonic background, sedimentary conditions and the configuration of transportation elements, different oil and gas migration and accumulation models have been formed in various oil and gas regions.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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