有机包裹体技术在油气运移与聚集中的应用研究

APPLICATION OF ORGANIC INCLUSIONS TECHNOLOGY TO THE STUDY OF OIL-GAS MIGRATION AND ACCUMULATION

储层岩石中的气液包裹体是被成岩作用胶结物所捕获,包裹在矿物晶格的缺陷或窝穴内的成岩成矿流体。有机包裹体对于油气的运移、聚集与成藏具有示踪作用。该文利用有机包裹体分析技术,对高邮凹陷北斜坡阜宁组储层岩石中的烃类包裹体的均一温度及烃类组成进行了详细的分析,发现北斜坡原始生烃母质以低等水生藻类和高等植物蜡质为主,沉积环境介质盐度相对较高,以缺氧环境为主,油气注入储层前业已成熟。通过烃类包裹体和烃源岩的生物标志化合物参数的对比发现,油气主要来自阜二段烃源岩。有机包裹体在油气运聚中的应用研究表明,北斜坡地区油气运移主要发生在早第三纪始新世晚期至晚第三纪,其中以始新世晚期为主,这与研究区区域的构造运动相吻合。

In this paper an advanced organic inclusion analysis technique was used to study the homogenization temperature and organic components of hydrocarbon inclusion in E2f of the northern slope of Gaoyou depression. The results indicate that the source inputs mainly come from lower aquatic algae and higher plants waxiness. The sedimentary environment was reducing and the salinity of the water medium was high. The hydrocarbons had been mature before they entered into the reservoirs. Contrasting with biomarker parameters of hydrocarbon inclusions and source rocks, it can be found that the hydrocarbons of the E2f mainly come from the E2f^2. Application of organic inclusions to oil--gas migration and accumulation shows that hydrocarbons migration of the study area mainly occur from later Eocene of early Tertiary to late Tertiary and the former one is most significant. It is consistent with regional structural movement in Gaoyou depression.