准噶尔盆地南缘沉积控制下含煤层气系统构成研究
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摘要
为了研究沉积环境演变对准噶尔盆地南缘西山窑组含煤层气系统的控制,运用钻井、测录井、露头等资料并辅以扫描电镜、图像粒度等精细分析方法,对煤层气系统进行了划分,并对其沉积演化过程进行了研究。研究结果表明:研究区可识别出5种沉积微相的砂体,隔水阻气能力呈"分流河道<决口扇和滩坝<天然堤和滨浅湖",并划分了单井垂向含煤层气系统; SQ4—SQ5时期,湖平面升高致使湖泊相发育面积扩大,聚煤作用减弱并主要集中在SQ4的TST、LST阶段,煤层发育、含气特征呈现出东西差异并与平面上沉积相展布特征相符;开发时需根据围岩的封隔性厘定含煤层气系统,根据系统特征选择适合的开发方法,同时注意规避垂向节理发育的砂岩含水层及开发层系组合。
In order to investigate the controlling of the sedimentation environment evolution on the coalbed methane system in Xishanyao Formation on the southern margin of Junggar Basin,using drilling wells,logging wells,outcrops and other data with the assistance of fine analysis methods,such as scanning electron microscope and image granularity,the coalbed methane system was divided,and its sedimentation evolution process was researched. The research results show that sand body of five types of sedimentation microfacies,whose waterand air-blocking capacity is sorted as"diversion channel
In order to investigate the controlling of the sedimentation environment evolution on the coalbed methane system in Xishanyao Formation on the southern margin of Junggar Basin,using drilling wells,logging wells,outcrops and other data with the assistance of fine analysis methods,such as scanning electron microscope and image granularity,the coalbed methane system was divided,and its sedimentation evolution process was researched. The research results show that sand body of five types of sedimentation microfacies,whose waterand air-blocking capacity is sorted as"diversion channel
引文
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