准噶尔盆地西北缘五-八区二叠系天然气类型判别及分布规律研究  

Identification of natural gas types and analysis on its distribution rules in Permian in Block No.5-8 of northwest margin of Jungar Basin

作　　者：杨海风[1] 韦恒叶[1] 姜向强[1] 王波[1] 王伟明[2] 

机构地区：[1]中国石油大学教育部“石油天然气成藏机理”重点实验室,北京102249 [2]大庆石油学院,黑龙江大庆163318

出　　处：《大庆石油地质与开发》2008年第1期46-50,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家重点基础研究(973)发展计划(2001CB209103)资助研究成果

摘　　要：依据天然气化学组分和稳定碳同位素数据,利用多种判别图版和方法,对准噶尔盆地西北缘五-八区二叠系天然气样品进行成因类型判别及分布规律研究。研究表明,研究区内二叠系天然气为有机成因气,进一步又划分为:来自风城组烃源岩的高成熟腐泥型气,来自佳木河组烃源岩的腐殖型气以及两者的混合型天然气。在垂向上,腐泥型天然气主要在上二叠统聚集分布,而腐殖型天然气则主要分布在下二叠统;横向上,腐殖型天然气和混合型天然气易于聚集在有深大断裂发育及风城组尖灭线之外的区域,而腐泥型天然气主要分布在风城组尖灭线附近。The genetic types and distribution rules of Permian natural gas in Block No. 5 - 8 of northwest margin in Junggar Basin are determined by natural gas components and stable carbon isotopes with the use of various charts and discrimination criteria. The result shows that natural gas in Permian of studied area is organic gas and it is further classified into 3 types： high matured sapropelic gas coming from Fengcheng formation, humic gas coming from Jianuhe formation and mixed gas coming from both of the above. Vertically, sapropelic gas mainly accumulates in Upper Permian, while humic gas mainly distributes in Lower Permian. Horizontally, humic gas and mixed gas easily accumulates in the area where there are discordogenic faults and the area outside the pinch-out boundary of Fengcheng formation, whereas sapropelic gas are mainly near to the pinch-out boundary of Fengcheng formation.

关 键 词：准噶尔盆地 二叠系 天然气 成因类型 分布规律 

分 类 号：TE122.11[石油与天然气工程—油气勘探]