辽河坳陷东部凹陷沙三段火成岩成因及储集特征  

Genetic analysis and reservoir characteristics of Sha3 igneous in eastern sag of Liaohe depression

作　　者：胡振华[1] 

机构地区：[1]中国石油辽河油田公司,辽宁盘锦124010

出　　处：《油气地质与采收率》2014年第4期46-49,114,共4页Petroleum Geology and Recovery Efficiency

基　　金：中国石油天然气股份有限公司科技重大项目"辽河探区有利预探区带综合评价和目标优选"(06-01D-01-02-02-1)

摘　　要：为进一步拓展辽河坳陷东部凹陷沙三段火成岩勘探空间,充分利用岩心观察、薄片鉴定、岩石化学分析和地震及测井等方法,深入开展东部凹陷沙三段火成岩的成因及储集特征研究。研究结果表明:辽河坳陷东部凹陷沙三段火成岩体发育,沿断裂呈串珠状分布,多期叠加;岩石类型主要有熔岩、脉岩和火山碎屑岩3大类;火山喷发模式属于裂隙式喷发,岩体主要分布在断层下降盘,岩相分为爆发相、溢流相和火山沉积相,其中爆发相是火成岩勘探的有利相带;主干断裂控制火成岩体形成;储集性能主要受构造裂缝、岩性和岩相控制,属裂缝—孔隙型储层。综合评价认为,研究区火成岩体具有平面分布广、纵向多期次叠加的特点,与深部优质烃源岩侧向接触,是形成复式油气藏的有利地区,也是开展深层火成岩勘探的重点目标区。In order to expand exploration space of Sha3 igneous in eastern sag,Liaohe depression,using core observation,thin-section analysis,seismic and logging methods,genesis and reservoir characteristics of igneous rock were studied thoroughly in Sha3 member in eastern sag.The results show that the igneous develops well in the layer of that area,presenting beaded distribution along faults and multi-stage superimposed.The major three rock types are lava,vein rock and pyroclastic rock.Volcanic erupted following the fissure pattern and igneous mainly distributed in the downthrown of faults.The major petrographic types are outbreak,overflow and volcanic sedimentary facies.Among them,the outbreak facies are the most favorable ones for igneous exploration.Main faults control igneous formation mechanism.The igneous rock belongs to fracture-pore type reservoir and its reservoir property is controlled by the factors of structural fracture,igneous lithology and lithofacies.Comprehensive evaluation shows that the igneous in the study area is characteristic of widespread distribution in horizontal,multi-stage superposition in vertical,and adjacent to the deep source rocks in lateral.It is favorable for the formation of complex reservoirs and also is the key target area for deep igneous exploration.

关 键 词：火成岩体 串珠状分布 多期叠加 裂隙式喷发 成因机制 储集性能 辽河坳陷 

分 类 号：TE112.111[石油与天然气工程—油气勘探]