澳大利亚苏拉特盆地煤层气地质特征及富集模式  被引量:22

Geological characteristics and accumulation mode of coalbed methane in Surat Basin of Australia

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作  者:俞益新[1] 唐玄[2] 吴晓丹[1] 苏展[1] 叶浩 YU Yixin;TANG Xuan;WU Xiaodan;SU Zhan;YE Hao(Research and Development Center, China National OJfshore Oil Coorprotion Gas & Power Group,Beijing 100028, China;School of Energy Resources, China University of Cssoseiences (Beijing) , Beijing 100083)

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]中国地质大学(北京)能源学院,北京100083

出  处:《煤炭科学技术》2018年第3期160-167,共8页Coal Science and Technology

基  金:中海石油气电集团有限责任公司科研基金资助项目(QDKY-2017-YFZX-14)

摘  要:苏拉特盆地中侏罗统Walloon煤系地层蕴含着巨大的煤层气储量,正确了解其成藏特点是成功开发的关键,综合运用了沉积学、地质统计学及天然气地球化学等研究手段对煤层的沉积环境、构造特点、煤岩煤质、天然气成因及富集模式进行了系统研究。研究结果表明:Walloon煤系主要以曲流河的河漫滩及曲流河三角洲平原的沼泽为沉积背景,煤岩具有演化程度低、灰分较高、显微组分变化差异小等特点;高渗透性、高兰氏压力是煤储层的显著特征;构造转换带对储层渗透率有重要影响;煤层含气量较低,煤层气成因类型以次生生物成因气为主,热成因气为辅;不同区域、不同层段成藏类型存在差异,北部向斜区Juandah组为水动力封堵型,东北部Undulla鼻隆区及东部斜坡的局部地区Taroom组为背斜—水驱封堵型。Large gas reserves are trapped in the coals of the Middle Jurassic Walloon Subgroup in the Surat Basin. In order to correctly understand the accumulation characteristics,the research means such as sedimentology,geostatistics and natural gas geochemistry are used synthetically to study the sedimentary environment,structural characteristics,coal petrology and quality,origin of gas and models of gas accumulation. The research results show that the coal seams in Walloon subgroup are deposited in the river floodplain of meandering river and the marsh of meandering river delta plain,the coal has the characteristics of low degree of evolution,high ash content and small change in macerals. High permeability and high Langmuir pressure are the prominent characteristics of coal reservoir. Structure transfer zone has an important influence on reservoir permeability. The gas content with the Walloon Subgroup coals is low,and it is most likely to be dominantly secondary biologic gas,thermogenic gas also act to increase gas contents. Coalbed methane accumulation type varies from regions and formations that the Juandah Coal Measures in the northern syncline area is hydrodynamic seal type,the Taroom Coal Measures in Undulla nose zone and some part of the eastern slope is an anticline-water drive sealing type.

关 键 词:苏拉特盆地 Walloon煤系地层 低煤阶 构造转换带 成藏模式 

分 类 号:TE122[石油与天然气工程—油气勘探]

 

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