摘要
为了能对渝西区块深层页岩气赋存条件有一个深入、全面的认识,本文从静态地质参数、埋藏热演化史、粘土矿物含量(脆性矿物含量)、地层厚度展布等多个方面进行了分析,结果表明渝西区块静态指标好,具有形成大型页岩气藏的条件。渝西区块五峰组具有分段性,上段为有机质含量大于2%的层较薄,下段为有机质小于2%的层较厚;四次构造运动复杂有别,使得地层缺失较多,主要生气期介于早侏罗世和早白垩世之间;地层向南向东地层加厚;脆性矿物含量高,利于工程压裂;粘土矿物中的伊利石含量高、绿泥石含量次之,伊/蒙混层含量较少。
A comprehensive analysis from the aspects of static geological parameters,burial thermal evolution history,clay mineral content(brittle mineral content),stratum thickness distribution and target layers shows that the west Chongqing block has good static index and conditions for forming large shale gas reservoirs.The Wufeng Formation in the west Chongqing block is characterized by thin layers with organic matter content more than 2%in the upper part and thicker layers with organic matter content less than 2%in the lower part.The four tectonic movements are complex and different,resulting in more strata hiatus,main gas generation period between Early Jurassic and Early Cretaceous,the strata thicker southward and eastward,high brittle mineral content favorable to engineering fracturing,illite more than chlorite,lesser mixed-layer clay mineral illite/montmorillonite.These show that the west Chongqing block has good exploration and development potential for deep shale gas.
作者
段国彬
陈朝刚
余平
赵卫军
刘斌
黄卫东
DUAN Guo-bin;CHEN Chao-gang;YU Ping;ZHAO Wei-jun;LIU Bin;HUANG Wei-dong(Chongqing Shale Gas Exploration and Development Co.,Ltd,Chongqing404100;SDIC Shale Gas Development and Utilization Co.,Ltd.,Chongqing400043)
出处
《四川地质学报》
2020年第3期402-405,共4页
Acta Geologica Sichuan
基金
重庆市科委项目"重庆地区中深层页岩气勘探开发关键技术与研究应用"(cstc2017zdcy-zdyfX0040)。
关键词
渝西地区块
深层页岩气
成藏条件
埋藏史
reservoir-forming conditions
stratum thickness
burial history
clay mineral
