苏北盆地高邮凹陷油气成藏特征研究

苏北盆地高邮凹陷近几年油气勘探的一系列重要发现，为重新认识凹陷的石油地质特征，总结油气分布特点和油气聚集规律，提供了较为丰富的信息。根据地层压力、泥岩孔隙度及地层水资料、油源对比和已发现的油藏原油物性（包括高压物性）的纵横向变化规律，总结出不同地质环境下的油气运移方式及油气聚集的规律。通过对该区压力封闭层的分布研究得知：压力封闭层对该区油气运移起明显的控制作用，不同的压力封闭模式控制不同的油气分布类型。该地区地层水的变化规律能有效地反映地层保存条件的差异，地面原油物性变化能很好地反映油气运移的方向，运移系数可以反映油气侧向、垂向运移的程度，定量地得出主要运移方式。

Characteristics of oil pool formation in Gaoyou sag, Subei basin

Lots of methods can be applied to studying characteristics of oil pool--forming. The methods selected to be applied to Gaoyou sag, Subei basin are pressure seal, characteristics of oil-field water and the changes of oil properties. pressure seal layer controls the distribution of oil and gas. Pressure seal in Gaoyou sag can be divided into three types, namely single- sealed, double-sealed and non-sealed type. Because of difference of structure and sedimentary evolvement, the type and salinity of oil- field water have great differences both on plane and in vertical way. The changes of oil properties on the ground can indicate the orientation of migration. Migration coefficient, also divided into lateral and vertical ones, can also point out the orientation of migration. From the parameters listed above, the distribution characteristics and accumulation rule of oil can be forecasted effectively.