摘要
GM地区测井评价证实川中茅口组顶不整合面以下100m发育岩溶储层,基于三维地震发现大量"下凹"岩溶塌陷体,二者共同指示川中茅口组存在强烈溶蚀作用。岩溶储层在茅口组顶部具有弱振幅的地震响应特征。岩溶储层发育区受古河道控制:古河道两侧水动力作用强,溶蚀作用强烈,易形成岩溶储层。川中茅口组烃源岩厚度大、分布广,岩溶储层发育,具备形成大规模岩性气藏的成藏条件。
Well logging data interpretation confirms Karst reservoirs developed below the unconformity of Maokou Formation in the Central Sichuan Basin,thickness around 100 m.A large number of Karst saddles are found on 3D seismic data.Both of them demonstrate the presence of strong karstification at Maokou Formation in the Central Sichuan.These Karst reservoirs show weak amplitude at thetop of Maokou Formation as seismic characteristics.Favorable Karst reservoir zones are controled by paleochannel in the GM area.Water energy was high at the both sides of paleochannels,and the karstification was rapid and strong,so Karst reservoirs were well developed.In the Central Sichuan Basin hydrocarbon source rocks were thick and distributed widely,Karst reservoirs were developed,and large-scale Karst lithologic gas reservoirs could be formed.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2017年第5期1049-1058,共10页
Oil Geophysical Prospecting
关键词
川中
茅口组
岩溶储层
岩溶塌陷
古河道
Central Sichuan Basin
Maokou Formation
Karst reservoir
Karst saddle
paleochannel
