川中地区上三叠统须家河组二段和四段沉积相  

Study on sedimentary facies in second and fourth members of Xujiahe Formation of upper Triassic in central Sichuan Basin

作　　者：库丽曼[1] 刘树根[1] 张长俊[1] 朱平[1] 雍自权[1] 罗玉宏[2] 龚昌明[2] 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室,四川成都610059 [2]中国石油西南油气田分公司川中油气矿,四川遂宁629000

出　　处：《油气地质与采收率》2007年第2期35-37,113,共3页Petroleum Geology and Recovery Efficiency

基　　金：新世纪优秀人才支持计划(NCET-04-0903)

摘　　要：在沉积学和石油地质学的基础上,综合应用测井、录井、钻井和岩心资料,对川中地区上三叠统须家河组二段和四段进行了高精度的沉积相研究,探讨了储集砂体的展布规律。川中地区上三叠统须家河组产油气层主要分布于浅湖砂坝、三角洲前缘河口砂坝、水下分支河道,部分席状砂、水上分支河道以及心滩微相也是良好的储层。建议今后勘探应注重三角洲平原亚相和前缘亚相的分支河道砂、河口砂坝中的块状粗—中砂岩储层。Upper Triassic sandstones in Sichuan Basin is an important target for petroleum exploration. Reservoir physical properties are determined by the sedimentation. Based on synthesized core observation and a large number of drilling and logging data, the sedimentary facies in second and fourth members of Xujiahe Formation in upper Triassic in central Sichuan Basin have been thoroughly investigated, and the distribution of reservoir sandstone bodies is also examined. The oil - gas producing strata in Xujiahe Formation in this area are mainly located in shallow lacustrine sand bars, river mouth bars in the delta front, submerged branch channels, sheet sands, branch channels above water and point bars in delta plain. In these microfacies, branch channel sand in delta, point bar, mouth bar and shore sand beach and shallow lacustrine sand bar are the good reservoirs. It suggests that the reservoirs with the branch channel sand in the delta plain and front and coarse to medium sandstones are the impor-tant exploration targets in the future.

关 键 词：沉积相 上三叠统 须家河组 碎屑岩 四川盆地 

分 类 号：TE111.3[石油与天然气工程—油气勘探]