澳大利亚博文盆地中部地区煤层气富集主控因素分析  

THE DOMINANT CONTROLS OF COALBED METHANE ACCUMULATION IN CENTRAL BOWEN BASIN IN AUSTRALIA

作　　者：俞益新[1] 吴晓丹[1] 谷峰[1] 唐颖[1] 石雪峰[2] YU Yi-xin WU Xiao-dan GU Feng TANG Ying SHI Xue-feng(Technical Research and Development Center, CNOOC, Beijing 100028, China Engineering Technology Branch, CNOOC , Tianjin 300457, 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]中海油能源发展股份有限公司工程技术分公司,天津300457

出　　处：《资源与产业》2017年第2期57-65,共9页Resources & Industries

摘　　要：澳大利亚博文盆地是典型的弧后聚煤盆地,煤层气商业化开发较早,其中部地区勘探程度低,是潜在的储量接替区,但煤层气富集规律尚不清楚,为此,分析盆地中部地区的构造特征、煤层发育特点、煤岩煤质与含气性等地质特征。研究结果表明,该区构造变形强烈,煤层埋深处于100~800 m,煤层厚8~22m,煤岩灰分与惰质组含量较高,Ro为1.5%~2.5%,煤层含气量普遍较高。通过深入剖析构造动力条件、煤岩演化条件及煤质条件与含气量的相关关系,认为:该区煤层气富集以构造动力条件为主要影响因素,斜坡、逆断层下盘等保存条件好的区域煤层含气量高,在背斜轴部、靠近断层等区域,煤层气保存条件差,含气量低;在相似的构造条件下,煤层气富集还受到煤质及演化程度的影响。Bowen basin in Australia as a typical back-arc coal basin has a long history in commercially development coalbed methane. Parts of this basin is less explored,where is of coalbed methane potential,but with its concentration rule unknown. This paper studies its structure,coal beds,coal-bearing rock,coal quality and coalbed methane geology. The structure had undergone a strong structural deformation. Coalbed,8 - 22 m thick,is buried at a depth of100 ~ 800 m,high ash and inertinite content,Ro 1. 5% -2. 5%,high CBM. From the relation of structure,coalbearing rock evolution and coal quality with CBM,the structural dynamic play a leading role in enriching CBM,which is high in slope or footwall of thrust fault where has a well preservation condition,low in axis of anticline,near the fault zone where has a poor preservation. Enrichment of CBM is also influenced by coal quality and coal evolution degree under similar condition.

关 键 词：博文盆地 煤层气 主控因素 含气性 构造条件 保存条件 

分 类 号：P618.13[天文地球—矿床学]