PREDICTION OF FAVORABLE MESOZOIC OIL AND GAS ACCUMULATION IN THE EAST DEPRESSION OF NORTH YELLOW SEA BASIN BY FLUID POTENTIAL ENERGY ANALYSIS
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摘要: 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)在各自势场的作用下,按各自的势场分布规律运动。针对钻井资料相对缺乏的情况,以较易获取的地震层速度建立一套计算北黄海地下流体势的数据模型,并以此对其进行实例分析,确定了地下流体势空间分布模式和盆地流体系统构成,以提高对油气运聚规律的认识,预测有利油气聚集区,为钻探部署和提高钻探成功率提供依据。研究表明,北黄海东部坳陷地下流体势分为高势区、低势区。高势区分布与活跃生油凹陷分布一致,是该区油气成藏的主要烃源区和动力源区;低势区分布与隆起与斜坡带相一致。利用流体分布规律预测了有利的油气聚集部位。Abstract: Fluid Potential is a comprehensive representation of all the underground fluid energy. Different fluids (oil, gas and water) are affected by fluid potential field in different way and shall move according to the respective distribution pattern of the potential field. The structure of fluid systems can be affirmed in a basin through exploring the spatial distribution pattern of underground fluid. As a result, the understanding of oil migration and accumulation may be improved, the favorable accumulating area of oil and gas could be predicated and success ratio of exploration will be enhanced. Since there are not enough drilling wells in the study area,a set of calculating methods for the fluid potential was established on the basis of accessible interval velocity. We applied the method to the case of North Yellow Sea Basin for study of the subsurface fluid(gas) migration.Two types of underground fluid potential field can be distinguished in the Eastern Depression Belt of North Yellow Sea Basin. The high potential field is coincided with the active oil generating depression which is the main source of hydrocarbon generation and dynamic force; and the low potential field is nearly located in the uplifts and slopes. The potential area for petroleum migration and accumulation can be predicted according to the distribution pattern of potential fields.
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