我国主要冻土区天然气水合物形成条件及成藏模式探讨  

Discussion about Natural Gas Hydrate Formation Conditions and Accumulation Pattern in China's Major Permafrost Regions

作　　者：张金华[1,2] 魏伟[1,2] 魏兴华[1] 王媛媛[3] 李小龙[1,2] 

机构地区：[1]中国石油勘探开发研究院廊坊分院,河北省廊坊市065007 [2]中国石油非常规油气重点实验室,河北省廊坊市065007 [3]华北油田华兴综合服务处第二物业服务站,河北省廊坊市065007

出　　处：《中国石油勘探》2013年第5期74-78,共5页China Petroleum Exploration

基　　金：中国石油天然气集团公司科技管理部项目"天然气水合物资源潜力分析及勘探评价技术研究"(2011A-4806)

摘　　要：从天然气水合物的温度、气源和水源等基本成藏要素着手,探索我国冻土区天然气水合物形成条件及可能的成藏模式。主要分析了羌塘盆地、祁连山地区以及漠河盆地油气地质条件和温度条件,并进一步总结了其天然气水合物成藏条件;其中,祁连山木里地区构造、气源和温度等条件相对较好,是目前冻土区天然气水合物勘探研究的有利区域。对木里地区天然气水合物的气源、石油地质条件及构造演化特征等方面的分析表明,断裂的发育控制了木里地区天然气水合物藏的形成,下部烃源岩生成的烃类气体在断层的作用下再次运移到水合物稳定带成藏;常规气藏经后期的构造抬升到水合物稳定带也可形成天然气水合物藏。This paper probed into the formation conditions and the possible accumulation model of permafrost natural gas hydrate in China, based on such hydrate forming key elements as temperature, air source, water source etc. It mainly analyzed petroleum geology and temperature of Qiangtang Basin, Qilian mountainous region and Mohe Basin, and further summarized natural gas hydrate forming conditions in these regions. The tectonic conditions, air source and temperature of Muli region in Qilian Mountain is relatively better as a whole, which is regarded as favorable for exploration and research of permafrost gas hydrate in China at present. Through analyzing gas hydrate source, petroleum geology, tectonic evolution and other characteristics, it showed that natural gas hydrate formation in Muli region is controlled by fault development. Under the action of the fault, lower thermogenic gas re-migrated to gas hydrate stability zone, forming gas hydrate. Besides conventional gas reservoir can also form hydrate reservoir, based on later tectonic uplift to gas hydrate stability zone.

关 键 词：祁连山 木里地区 天然气水合物 形成条件 成藏模式 

分 类 号：TE122.2[石油与天然气工程—油气勘探]