惠民凹陷临南洼陷异常低压与油气聚集的关系

The analysis of the characteristics of subnormal pressure and hydrocarbon accumulation in Linnan Subsag, Huimin Sag

目的 探讨惠民凹陷临南洼陷异常压力类型与油气聚集的关系,指导油气勘探。方法 通过大量基础数据,分析了临南洼陷的异常压力特征,以及异常低压对本区油气分布的影响。结果 临南洼陷具有明显的负压型异常压力特征;油气主要在中深部地层富集。结论 临南洼陷的负压异常对该地区油气运聚具有明显的控制作用,异常低压造成深部垂向运移动力较弱,使深部产生的油气不易快速有效地向浅部地层运移,通常只能从洼陷中心向湖盆边缘近距离的侧向和垂向运移,油气主要在中深部地层富集,并在深部形成自生自储式油气藏。

Aim Discussing the the relationships between the hydrocarbon distribution and the type of pressure in Linnan subsag and guiding the hydrocarbon exploration.Methods A lot of basic data are used to analyze the characteristics of subnormal pressure in Linnan subsag and how it exerts influence on hydrocarbon distribution. Results The Linnan Subsag has clear characteristics of subnormal pressure, and oil and gas mainly accumulate at the deeper strata.Conclusion The subnormal pressure in Linnan subsag controls hydrocarbon migration and accumulation strongly. The poor power of vertical migration in deeper strata, caused by the subnormal pressure, makes oil and gas cannot migrate to the upper strata easily and effectively, so they usually migrate laterally or vertically to a short distance from the center to the edge of basins and tend to accumulate at the deeper strata.