CAJ | 학술논문

如何定义煤层气藏、如何界定气藏边界是认识煤层气藏的关键,要评价煤层气富集区首先要找出控制其成藏的主要因素.为此,结合我国含煤盆地的典型煤层气藏特征,围绕煤层气藏边界类型、成藏主控因素进行了探讨,并预测了沁水、鄂尔多斯、准噶尔盆地的煤层气富集区.结论认为:①煤层气藏的边界是煤层气藏划分的前提,煤层气藏主要有5种地质边界类型:水动力边界、风氧化带边界、物性边界、断层边界和岩性边界;②煤层气藏的形成经历了煤层气的生成和吸附、煤层的吸附能力增加和煤层气的解吸-扩散和保存阶段;③保存阶段是成藏的关键,区域构造演化、水动力条件和封闭条件是主要的成藏控制因素.进而在沁水盆地、鄂尔多斯盆地和准噶尔盆地优选出9个煤层气有利富集区:晋城、阳城、安泽、阳泉、大宁-吉县、韩城、吴堡、准南、阜康.
여하정의매층기장、여하계정기장변계시인식매층기장적관건,요평개매층기부집구수선요조출공제기성장적주요인소.위차,결합아국함매분지적전형매층기장특정,위요매층기장변계류형、성장주공인소진행료탐토,병예측료심수、악이다사、준갈이분지적매층기부집구.결론인위:①매층기장적변계시매층기장화분적전제,매층기장주요유5충지질변계류형:수동력변계、풍양화대변계、물성변계、단층변계화암성변계;②매층기장적형성경력료매층기적생성화흡부、매층적흡부능력증가화매층기적해흡-확산화보존계단;③보존계단시성장적관건,구역구조연화、수동력조건화봉폐조건시주요적성장공제인소.진이재심수분지、악이다사분지화준갈이분지우선출9개매층기유리부집구:진성、양성、안택、양천、대저-길현、한성、오보、준남、부강.
How to define a coalbed gas reservoir and identify its boundary is important for researchers to know well about the coalbed gas reservoirs, and a better evaluation on the coalbed gas-rich areas relies mostly on a better understanding of the main controlling factors of coalbed gas pooling. Therefore, in combination with the characteristics of typical coalbed gas reservoirs in some coal-bearing basins in China, this paper discussed the boundary types and the main controlling factors of coalbed gas reservoirs, and forecast the coalbed gas-rich areas in the Qingshui, Ordos, and Junggar basins. The conclusion was presented as follows: a. the boundary of a coalbed gas reservoir is the prerequisite of classifying the coalbed gas reservoir types, and five boundary types include hydrodynamic boundary, the boundary of efflorescent oxygenized belts, petrophysical boundary, fault boundary, and lithological boundary; b. a coalbed gas reservoir came into being after the following stages: methane gas first generated and was adsorbed in coalbed layers, then the adsorption ability of coalbed layers increased, and gas was preserved after desorption-diffusion-migration; c. the preservation stage plays an important role in a coalbed gas reservoir, and regional structure evolution, hydrodynamic and sealing conditions are the main controlling factors. Furthermore, nine optimal coalbed gas-rich areas were selected from the Qingshui, Ordos, and Junggar basins: Jincheng, Yangcheng, Anze, Yangquan, Daning-Jixian, Hancheng, Wubao, Zhunnan, Fukang.