| 煤系页岩气储层研究进展 |
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| 引用本文： | 张学庆,李贤庆,李阳阳,和钰凯,张吉振,张亚超.煤系页岩气储层研究进展[J].中国煤炭地质,2020(2):59-66. |
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| 作者姓名： | 张学庆 李贤庆 李阳阳 和钰凯 张吉振 张亚超 |
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| 作者单位： | 中国矿业大学（北京）煤炭资源与安全开采国家重点实验室;中国矿业大学（北京）地球科学与测绘工程学院 |
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| 基金项目： | 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。 |
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| 摘 要： | 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%,R o>0.7%,孔隙度>2%,脆性矿物含量>30%,黏土矿物含量<50%,含气量>1 m 3/t,煤系页岩有效厚度定为>30m、埋深>1000m,同时应考虑气藏封闭性及构造稳定性。
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| 关 键 词： | 煤系 页岩气 储层特征 赋存状态 影响因素 |
Research progress of reservoir of shale gas in coal measures |
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| Zhang Xueqing,Li Xianqing,Li Yangyang,He Yukai,Zhang Jizhen,Zhang Yachao.Research progress of reservoir of shale gas in coal measures[J].Coal Geology of China,2020(2):59-66. |
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| Authors: | Zhang Xueqing Li Xianqing Li Yangyang He Yukai Zhang Jizhen Zhang Yachao |
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| Institution: | (State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology(Beijing),Beijing 100083,China;College of Geoscience grad Surveying Engineering,China University of Technology(Beijing),Beijing 100083,China) |
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| Abstract: | Shale gas in coal measures is an important type of unconventional natural gas.Reservoir research can provide theoretical basis for shale gas development in coal measures.Based on the investigation and analysis of literature at home and abroad,this paper expounds the research progress of reservoir of shale gas in coal measures from the aspects of distribution and geochemical characteristics of shale gas in coal measures,reservoir characteristics and gas bearing property,occurrence state of shale gas in coal measures,enrichment influencing factors and favorable reservoir optimization.The results show that the thickness of shalein coal measures is thin,the cumulative thickness is large,the type of organic matter is mainly type III,the content of clay minerals in the reservoir minerals is relatively high,and the gas content meets the requirements of commercial development.The occurrence state of shale gas in coal measures is essentially determined by the pore structure of the reservoir.Shale gas mainly exists in the form of adsorption state in micropores,while in the form of free state in mesopores and macropores.The enrichment of shale gas in coal measures is mainly affected by the characteristics of organic matter,mineral composition,reservoir structure and lithologic combination.High content of organic matter is favorable for shale gas occurrence;clay minerals have strong adsorption capacity,and more micropores and mesopores are developed,which is conducive to shale gas enrichment;the increase of reservoir porosity is conducive to shale gas enrichment;when coal shale and coal seam interbedding,there is pressure sealing and coal seam gas filling,which is conducive to enrichment.The favorable reservoirs of coal shale gas are:TOC content>2%,R o>0.7%,porosity>2%,brittle mineral content>30%,clay mineral content<50%,gas content>1 m 3/t,effective thickness of coal shale>30 m,burial depth>1000 m,and gas reservoir sealing and structural stability should be considered. |
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| Keywords: | Coal measures Shale gas Reservoir characteristics Occurrence state Influence factor |
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