流体势与油气运聚规律研究——以孤东地区为例

流体势是地下流体所有能的综合表现,不同的流体(如油、气、水)在各自的势场作用下,有各自的势场分布规律运动.通过研究地下流体势空间分布模式,可确定盆地流体系统构成,提高对油气运移规律的认识,明确预测有利油气聚集区,提高钻探成功率.研究表明,孤东地区地下流体势类型分为高势区、低势区,高势区分布与活跃生油洼陷分布一致,是孤东地区油气成藏的主要烃源区和动力源区.低势区与目前的油气田吻合较好.由此可依据流体低势区来预测新的油气聚集部位.

RELATIONSHIP BETWEEN FLUID POTENTIAL AND HYDRCARBON MIGRATION AND ACCUMULATION-A CASE STUDY OF GUDONG AREA

Fluid Potential is a comprehensive representation of all underground fluid energy. Different f luids (oil, gas and water) are affected by fluid potential field and moved according to the respective potential field distribution. Through exploring model of spatial distribution of underground fluid, the structure of fluid systems can be affirmed in a basin, the understanding about migration and accumulation of oil may be improved, the favorable accumulating area of oil and gas is predicated and exploring success ratio is increased. Two types of underground fluid potential in Gudong area can be distinguished: the high potential fields are coincided with the distribution of active generating sag and are main sources of hydrocarbon generation and dynamic force; and the low potential fields are nearly located in the present oil and gas fields. Therefore, the potential area for petroleum migration and accumulation can be ascertained according to the distribution of low potential field.