水溶相天然气出溶成藏条件及成藏模式  

Accumulation conditions and modes of the exsolved gas from water phase

作　　者：刘江涛[1] 李三国[1] 

机构地区：[1]中国石油化工股份有限公司石油工程技术研究院,北京100101

出　　处：《西安石油大学学报（自然科学版）》2012年第6期31-35,5+4,共5页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家"973"重点基础研究发展计划项目(编号:2007CB209503)

摘　　要：水溶相天然气是一种重要的非常规天然气资源.通过实例分析,认为水溶相天然气出溶成藏需要满足3个要素:充足的气源供给是物质基础,高天然气溶解度差是重要条件,引起温压变化的地质事件是关键因素.与常规天然气相比,水溶相天然气析出后具有干燥系数大,异构烷烃、芳香烃、苯和甲苯富集,碳同位素偏重,非烃类CO2和N2富集等一系列地球化学特征,可以作为识别出溶气藏的证据.根据地质条件和成藏过程的不同,认为水溶相天然气成藏存在3种模式:断裂垂向短距离输导模式、输导层侧向长距离运移模式和构造抬升原地成藏模式.The water-dissolving natural gas is an important unconventional natural gas resource.By the analysis of examples,it is held that the exsolution and the accumulation of the natural gas in water-dissolving phase must meet three elements:plenty of gas supply,which is the material base;great solubility difference of gas in water;geological events which cause the changes of temperature and pressure.Compared with conventional gas,the exsolved gas has the geochemical characteristics of high drying coefficient,rich isomerization alkane,aromatic hydrocarbons,benzene and toluene,heavier δ13C1 and rich CO2 and N2.These geochemical characteristics can be used for identifying water-soluble gas.According to the geological conditions and accumulation process,it is held that the accumulation of the exsolved gas has three modes:vertical short-distance migration model by fracture,lateral long-distance migration model by conducting layer and in-situ accumulation model by tectonic uplift.

关 键 词：水溶相天然气 溶解度 地球化学特征 成藏条件 成藏模式 

分 类 号：TE122[石油与天然气工程—油气勘探]