澳大利亚加里里盆地煤层气控气因素及富集区预测  

Controlling factors of coalbed methane and accumulation areas in Galilee basin in Australia

作　　者：谷峰[1] 李乐忠[1] 俞益新[1] 苏展[1] 葛岩 郝岩[3] 刘晓健 GU Feng;LI Lezhong;YU Yixin;SU Zhan;GE Yan;HAO Yan;LIU Xiaojian(Technology Research and Development Center of Power and Gas Company of CNOOC, Beijing 100028, China;Unconventional Energy Institute of Engineering and Technology Service Company of CNOOC, Tianjin 300450, China;Coal Information Institute of the State Administration of Work Safety Supervision, Beijing 100028,China;Tianjin Company of CNOOC, Tianjin 300450, China)

机构地区：[1]中海石油气电集团有限责任公司技术研发中心,北京100028 [2]中海石油工程技术公司非常规研究院,天津300450 [3]国家安全生产监督管理总局煤炭信息研究院,北京100028 [4]中海石油(中国)天津分公司勘探开发研究院,天津300450

出　　处：《煤田地质与勘探》2017年第2期55-61,共7页Coal Geology & Exploration

摘　　要：加里里盆地为澳大利亚东部主要的含煤盆地,也是其煤层气勘探开发的主要区块。通过煤质特征、气源条件、构造演化、盖层条件和水文条件等对煤层气富集的主控因素和富集区进行研究。结果表明,该区煤质及生气能力相当,白垩纪中期煤层开始持续生气;白垩纪晚期的区域构造抬升使气藏遭到破坏;扇三角洲主扇体间的局部泥岩相对发育,可形成良好盖层;靠近盆地中心存在地层水滞留区,地层水矿化度高,氯化钙型为主,对煤层气保存有利,含气量和氮气组分也显示含气性变好。因此,良好局部盖层的发育和滞水环境是该区煤层气富集的主控因素;Hulton-Road构造东北、Marathon单斜以东区域及中部Berly突起以北部分区域煤层的富气条件好,是煤层气的富集区。Galilee basin is the main coal basin in eastern Australia and also the important area of coalbed methane exploration and development.Through the coal quality,gas source,structure evolution,sealing conditions and hydrology conditions,main gas control factors and accumulation areas were studied.The researches show that coal quality and the ability of generating gas are not variable,coal began generating gas continuously from Mid-Cretaceous;the tectonic movement in Late Cretaceous destroyed the gas accumulation;mudstone is more developed in the area between the fluvial fans,forming good cap;water retention area was formed near the center of the basin,the salinity is higher and the formation water is mainly of calcium chloride type,which are benefit for the gas preservation;the nitrogen proportion of the desorbed gas and gas content also show that the gas-bearing property is better.Development of good local cap and water retention environment are the main gas controlling factors of coalbed methane accumulation.The gas accumulation conditions are better in the northeast of Hulton-Road structure,the east of Marathon monoclinic and the north of Berly uplift in the central basin are the coalbed methane accumulation areas.

关 键 词：煤层气 主控气因素 富集区 澳大利亚加里里盆地 

分 类 号：P618.13[天文地球—矿床学]