雷家地区沙四段湖相碳酸盐岩油气藏特征分析  

Lacustrine Carbonate Reservoir Properties of Sha4 in Leijia

作　　者：李晓光[1] 金科[1] 周艳[1] 

机构地区：[1]中国石油辽河油田分公司,辽宁盘锦124010

出　　处：《特种油气藏》2016年第4期25-28,152,共4页Special Oil & Gas Reservoirs

基　　金：国家油气重大专项"渤海湾盆地精细勘探关键技术"(2011ZX05006)

摘　　要：雷家地区沙四段白云岩油藏为"源储双控"型油气藏。通过岩性鉴定、储层物性分析和地球化学检测等手段,结合已发现油气的分布特征,研究该区湖相碳酸盐岩的油气成藏特征。研究表明:该区高升油层组储集岩主要为粒屑云岩,杜家台油层组主要为泥晶云岩,油气分布受构造控制不明显,在孔洞、裂缝发育的粒屑云岩和泥晶云岩的"甜点"区油气相对较为富集;烃源岩分布广泛,纵向上储集层和烃源岩相互叠置,呈"三明治"结构;在生烃门限之上以常规油气藏为主,具有统一油水界面;生油门限之下以连续型油气藏为主,生、储、盖三位一体,呈连续分布。该成藏特征新认识对深化区域地质研究和寻找有利目标区具有指导意义。The dolomite reservoir in Sha4 formation of Leijia is considered as'source-reservoir dual-controlled'hydrocarbon reservoir. Lithology identification,reservoir property analysis and geochemical test are used to analyze the hydrocarbon accumulation of lacustrine carbonate reservoir I by combining with previous hydrocarbon distribution. Research shows that Gaosheng and Dujiatai reservoirs mainly consist of grained dolomite and dolomicrite respectively. The hydrocarbon distribution is less dependent on tectonism and the'sweet-spot'of grained dolomite and dolomicrite with well-developed caves and fractures shows relatively favorable hydrocarbon enrichment. In the longitudinal direction,the widespread source-rocks are superposed with reservoirs in'sandwich'structure. Conventional hydrocarbon reservoirs with a uniform oil-water interface are dominant above the hydrocarbon-generation threshold. Continuous hydrocarbon reservoirs are dominant below the hydrocarbon-generation threshold and the trinity of source-reservoir-caprock is characterized by continuous distribution. This new understanding of hydrocarbon accumulation could provide certain guidance for further geology study and identification of favorable area.

关 键 词：白云岩 “甜点” “三明治”结构 源储双控型油气藏 雷家地区 

分 类 号：TE121.2[石油与天然气工程—油气勘探]