鄂尔多斯盆地三叠系长7段致密油成藏机理

发布时间：2018-01-01 21:08

本文关键词：鄂尔多斯盆地三叠系长7段致密油成藏机理　出处：《石油勘探与开发》2016年04期 　论文类型：期刊论文

【摘要】：为研究鄂尔多斯盆地三叠系延长组7段致密油成藏机理和分布特征,对长7段致密储集层沉积环境、岩石学特征、孔喉结构特征、运聚动力和成藏过程等进行系统分析。长7段致密油储集层主要为半深湖—深湖相砂质碎屑流沉积和三角洲前缘水下分流河道沉积。场发射扫描电镜、CT扫描等高分辨率显微技术研究表明,致密油储集层物性差,发育微—纳米级孔喉,以粒间孔和长石溶孔为主,管束状和条带状孔隙是有利的储集空间。致密油储集层生烃和成藏模拟实验结果表明,长7段优质烃源岩生烃增压动力强,成藏阶段储集层含油饱和度逾50%,随着动力的持续增加油气开始富集,含油饱和度可超70%。长7段致密油源储共生,烃类在高压驱动下,沿着相互叠置的相对高渗砂体、网状裂缝等输导体系运移,形成大面积连续或准连续分布的油气聚集。
[Abstract]:In order to study the mechanism and distribution of tight oil accumulation in member 7 of the Triassic Yanchang formation in Ordos Basin, the sedimentary environment, petrology and pore throat structure of the tight reservoir of member Chang7 are studied. The migration and accumulation dynamics and reservoir forming process were systematically analyzed. The dense oil reservoirs of Chang 7 are mainly composed of semi-deep lacustry-deep lacustrine sandstone clastic flow deposition and delta front underwater distributary channel deposition. Field emission scanning electron microscopy (SEM). Ct scanning and other high-resolution microscopy techniques show that dense oil reservoir has poor physical properties and developed micro-nanometer pore throat, mainly intergranular pore and feldspar solution pore. The experimental results of hydrocarbon generation and reservoir formation in dense oil reservoir show that the hydrocarbon generation pressure of the high quality hydrocarbon source rock of Chang 7 member is strong. The oil saturation of reservoir is over 50% during the reservoir forming stage. With the continuous increase of oil and gas dynamics, the oil saturation can begin to enrich, the oil saturation can exceed 70. 7 member tight oil source storage symbiosis, and the hydrocarbon is driven by high pressure. Along the superimposed relatively high permeability sand bodies, reticular fractures and other transport systems, a large area of continuous or quasi-continuous distribution of oil and gas accumulation is formed.
【作者单位】：西南石油大学地球科学与技术学院;中国石油长庆油田公司勘探开发研究院;低渗透油气田勘探开发国家工程实验室;中国石油长庆油田公司;中国石油勘探开发研究院;
【基金】：国家重点基础研究发展计划(973)项目“中国陆相致密油(页岩油)形成机理与富集规律基础研究”(2014CB239005-003)
【分类号】：P618.13
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