渤海湾盆地深南油田油气成藏条件与潜力分析

Analysis of hydrocarbon accumulation conditions and potential in Shennan oilfield,Bohai Bay Basin

深南油田位于渤海湾盆地冀中坳陷中部的深县凹陷,研究区内断层发育,油气分布受到断层影响,属于典型的构造油气藏。通过油藏分布规律研究,深南油田油源主要来源于沙河街组一、三段烃源岩,储层条件良好,上部具有一套稳定泥岩盖层,东营组与沙河街组油气从深凹区沿输导层横向运移形成原生油气藏,明化镇组与馆陶组为油气沿断层纵向运移形成的次生油气藏。潜力研究认为,台4区块深层东营组、沙河街组存在油气藏,泽10、泽70区块具有较好的断层疏导体系,浅层具有油气成藏潜力。

Shennan oilfield is located in the Shenxian sag in the middle of Jizhong depression in the Bohai Bay Basin.It has a geat development of faults.Therefore,the distribution of oil and gas is affected by faults.It belongs to a typical structural hydrocarbon accumulation.According to the study of reservoir distribution,the oil source is mainly from the first and third members of Shahejie Formation.The reservoir conditions in this area are good because there is a stable mudstone cap rock in the upper part.The oil and gas in the Dongying Formation and Shahejie Formation migrated laterally along the transport layer from the deep depression to form primary oil and gas reservoirs,while the Minghuazhen Formation and Guantao Formation are secondary oil and gas reservoirs formed by vertical migration of oil and gas along faults.Through the study of reservoir potential,there are oil and gas reservoirs in the deep Dongying Formation and Shahejie Formation of Tai-4 block.In addition,Ze-10 and Ze-70 blocks have good fault diversion systems and have potential for oil and gas accumulation in shallow layers.