岩性油藏动态解剖方法研究——以苏北盆地高邮凹陷马33油藏为例

Method of Dynamic Dissection of Lithologic Reservoir:A Case Study of Ma 33 Oil Reservoir in Gaoyou Sag,Subei Basin

传统油藏静态解剖难以全面认识油藏的规律和特点,油藏动态解剖分析方法是研究油气成藏过程和成藏规律的重要探索。油藏动态解剖是首先进行油气成藏关键因素(地层孔隙度、流体压力等)的恢复,得到成藏前、成藏期以及成藏后砂泥岩孔隙度、流体压力等成藏基本要素在时空的变化规律,然后建立油气充注临界动力学方程,并以典型油藏成藏期次为依据,进行成藏要素综合对比分析,最终确定关键成藏要素的最佳动态组合和时空配置的一种研究方法。通过开展高邮凹陷马33油藏动态解剖,对于深化认识研究区油气成藏规律、确定成藏主控因素及预测有利区域都具有重要的意义。研究结果表明,高邮凹陷岩性油藏形成的关键因素是输导通道和圈闭条件,高邮凹陷岩性油藏具有"二元成藏"特点。

It is difficult for traditional static dissection to comprehensively understand oil reservoir accumulation rules and characteristics.However,dynamic dissection can overcome these shortcomings.Thus,dynamic analysis is a new approach to study hydrocarbon accumulation process and rules.Dynamic dissection refers to recovering key factors of hydrocarbon accumulation(formation porosity,fluid pressure,etc.)firstly,then building up oil and gas filling dynamics equation,undertaking evaluation and comparative analysis of key factors controlling hydrocarbon accumulation combining with determination of reservoir forming stages,finally determining optimal dynamic combination of key factors.This paper studied the evolution process of key factors controlling hydrocarbon accumulation of Ma33 oil reservoir.The study is of great significance for deepening the understanding of oil and gas accumulation in the region,and identifying main factors of oil reservoir accumulation and predicting reservoir favorable regions.The results show that Ma33 oil reservoir accumulation was controlled by two key factors:migration pathways and trap.