HX地区长4+5油层组油藏特征及成藏主控因素分析

针对HX地区长4+5油层组成藏控制因素不清、影响后续勘探及开发有利区筛选的问题,在钻井、试油及测井资料的基础上,结合前人区域构造研究成果,首次对长4+5油藏特征及成藏主控因素进行了分析。结果表明岩性油藏是研究区长4+5油层组最主要的油藏类型,单个油藏规模较小,纵向上多个单油藏叠合发育,错叠、拼接形成多个分布零散的复合含油有利区。油藏物性区块差异明显,南部油藏物性优于北部,渗透率与试油产量没有相关性。烃源岩分布对长4+5成藏有一定的控制作用,基底断裂及附近区带存在石油运移至长4+5成藏的优势通道,决定着油藏的分布,是成藏的主控因素,后续的勘探开发工作应围绕基底断裂及附近区带展开。

Reservoir characteristics and its main controlling factor of hydrocarbon accumulation in Chang 4+5 oil layers of HX area

As the main controlling factors of hydrocarbon accumulation in Chang 4+5 oil layers of HX area are unclear,there will be bad impact on screening the favorable areas on subsequent exploration and development.Based on drilling,well testing and logging data,combined with previous regional structure study results,the research on reservoir characteristics and its main controlling factor of hydrocarbon accumulation in Chang 4+5 oil layers of HX area has been firstly carried out.The results show that lithologic reservoir is the main oil reservoir type,with smaller single reservoir scale,more single reservoirs longitudinally laminated,staggered and spliced to form more scatted oily favorable areas.The differences of reservoir physical properties are obvious,and the reservoir physical property in the south is superior to that of in the north.There is no correlation between permeability and test oil production.The source rocks distribution is of certain control on Chang 4+5 reservoir,and there is a preferential migration passage at the basement fracture and the around area,which is the main controlling factor of hydrocarbon accumulation and determines the oil reservoir distribution.Therefore,the subsequent exploration and development work should focus on and near the basement fracture zone.