煤系页岩气储层研究进展Research progress of reservoir of shale gas in coal measures
张学庆,李贤庆,李阳阳,和钰凯,张吉振,张亚超
摘要(Abstract):
煤系页岩气是煤系非常规天然气的重要类型。储层研究可为煤系页岩气开发提供理论基础。基于国内外文献调研分析,从煤系页岩分布与地化特征、储层特征与含气性、煤系页岩气赋存状态、富集影响因素、有利储层优选方面,阐述了煤系页岩气储层研究进展。研究表明:煤系页岩单层厚度薄,累计厚度大,有机质类型以Ⅲ型为主,储层矿物中黏土矿物含量相对较高,含气量具备商业开发所需条件。煤系页岩气赋存状态本质上取决于储层孔隙结构,页岩气在微孔中主要以吸附态的形式存在,而在中孔和宏孔中游离态是其主要存在形式。煤系页岩气富集主要受到有机质特征、储层矿物组成、储层结构特征、岩性组合的影响。有机质含量高有利于页岩气赋存;黏土矿物具有较强的吸附能力,多发育微孔和中孔,有利于页岩气富集;储层孔隙度的增加有利于页岩气富集;煤系页岩与煤层互层时,存在压力封闭和煤层气充注,利于富集。煤系页岩气有利储层优选为:TOC含量> 2%,Ro> 0. 7%,孔隙度> 2%,脆性矿物含量> 30%,黏土矿物含量<50%,含气量> 1 m3/t,煤系页岩有效厚度定为> 30m、埋深>1 000m,同时应考虑气藏封闭性及构造稳定性。
关键词(KeyWords): 煤系;页岩气;储层特征;赋存状态;影响因素
基金项目(Foundation): 国家自然科学基金项目(编号:U1810201,41572125);; 国家重大专项课题(编号:2016ZX05007-003);; 中央高校基本科研业务费专项资金项目(2010YM01)的联合资助
作者(Author): 张学庆,李贤庆,李阳阳,和钰凯,张吉振,张亚超
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