济阳坳陷地层油气藏油气运移动力与方式探讨

油气运移研究相对不足是目前制约济阳坳陷地层油气藏勘探的关键因素之一。本文依据油气成藏动力学理论,运用流体包裹体分析技术、油气运移物理模拟实验和地质统计学方法,对地层油气藏油气运聚动力与方式进行了探讨。研究认为,济阳坳陷地层油气藏油气运移动力早期以流体异常压力为主,后期逐渐过渡到以浮力为主;流体异常压力推动着含烃流体向外运移,浮力因输导层产状变化而具有一定的局限性;"高压临时仓储"的存在增加了远距离地层圈闭的成藏几率;盆缘流体异常压力值和地层水矿化度值突进方向与盆缘鼻状构造、坡折带展布方向一致,为油气运移的主要汇聚方向;流体异常压力的形成与发育特点决定了油气运移方式以幕式为主,也使济阳坳陷横向上发育多种地层油藏类型、纵向上发育多套含油层系。

Hydrocarbon migration agent and fashion of the stratigraphic reservoir in Jiyang Depression

The Relative defect of research on hydrocarbon migration greatly restricts the exploration of the stratigraphic reservoir in Jiyang Depression, In the paper, hydrocarbon migration agent and fashion of the stratigraphic reservoir is researched by utilizing dynamics of reservoir forming fluid inclusion analytic technique, hydrocarbon migration physical simulation experiment, and geostatistics means. The results show that hydrocarbon migration agent of the stratigraphic hydrocarbon reservoir early stage is mainly fluid abnormal pressure, gradational transits buoyancy later stage in Jiyang Depression, hydrocarbon-bearing fluid outwardly migrates with promotion of fluid abnormal pressure, buoyancy action presents definite limitation as a result of attitude changing of strata. Presence of the high pressure and/or temporary warehousing increases reservoir-forming probability of far range stratigraphic trap. Rushing orientation of fluid abnormal pressure value and formation water salinity value consists with distributing orientation of nosing structure and break zone, it is oil-gas concourse main orientation in the brim of basin. Forming and developing trait of fluid abnormal pressure decides that hydrocarbon migration fashion is mainly episodic migration, and causes that there are horizontally more stratigraphic hydrocarbon reservoir types and vertically more oil-bearing series in Jiyang Depression.