川东北地区陆相两类砾岩岩石与储层特征

川东北地区发育上三叠统须家河组须四段和下侏罗统自流井组珍珠冲段两套陆相砾岩储层。根据对岩心、测井、岩石薄片、物性等多种资料的深入研究,认为两类砾岩分别发育于高位冲积扇和低位扇三角洲体系中,西部须家河组以钙质砾岩为主,胶结作用为方解石胶结,发育裂缝型储层; 东部须家河组和整个珍珠冲段以石英质砾为主,硅质砾及火山岩砾次之,主要为粘土矿物胶结和硅质胶结,发育孔隙-裂缝型储层,两类砾岩邻近烃源岩,具备良好的生储盖条件,是有利的勘探目标。

Characteristics of rock and reservoir of two kinds of continental facies conglomerates in northeast Sichuan Basin

Northeast Sichuan developed two sets of conglomerate reservoir,which were the fourth member of Xujiahe Formation and Zhenzhuchong member of Ziliujing Formation.According to the core,well logging,rock thin section,physical and other data,founding that those two kinds of conglomerate grown in alluvial fan and fan delta system.The west of the fourth Member of Xujiahe Formation's characteristics was calcareous conglomerate,calcite cementation,fractured reservoir; the east of the fourth member of Xujiahe Formation and Zhenzhuchong member of Ziliujing Formation's characteristics was mainly quartz gravel,just a little of siliceous gravel and volcano rock gravel,clay mineral cement and cementation,developmental pore-fractured reservoir.Two types of conglomerate have good source-reservoir-cap conditions,is a powerful exploration target.