天然气藏中CH4—H2O—NaCl体系不混溶包裹体群捕获温压恢复及应用  

The trapping temperature and pressure of CH4-H2O-NaCl immiscible fluid inclusions and its application in natural gas reservoir

作　　者：席斌斌[1,2] 申宝剑[1,2] 蒋宏[1,2] 杨振恒[1,2] 王小林[3] XI Bin-bin;SHEN Bao-jian;JIANG Hong;YANG Zhen-heng;WANG Xiao-lin(Wuxi Institute of Petroleum Geology,SINOPEC,Wuxi 214126,China;SINOPEC Key Laboratory of Petroleum Accumulation Mechanistns,Wuxi 214126,China;School of Earth Sciences and Engijieering,Nanjing University,Nanjing 210023,China)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所,江苏无锡214126 [2]中国石油化工集团公司油气成藏重点实验室,江苏无锡214126 [3]南京大学地球科学与工程学院,江苏南京210023

出　　处：《天然气地球科学》2020年第7期923-930,共8页Natural Gas Geoscience

基　　金：国家科技重大专项“大型油气田及煤层气开发”(编号:2017ZX05036)资助~~。

摘　　要：CH4-H2O-NaCl体系不混溶包裹体群被广泛应用于恢复天然气成藏期的捕获温度及压力。前人提出了针对富气端元包裹体和富水溶液端元包裹体的不同的捕获温压恢复方法。为对比2类包裹体捕获温压恢复的效果,在对前人方法进行梳理的基础上,以四川盆地南部YA井志留系龙马溪组黑色页岩中的石英—方解石为例,通过详细的岩相学分析,选择同一FIA(流体包裹体组合)的富气端元包裹体和富水溶液端元包裹体进行了捕获温度、压力恢复。结果表明:同一FIA的2类包裹体恢复的捕获温度、压力结果分布范围基本一致,呈现出捕获温度变化范围较窄(212.0~220.7℃)但捕获压力变化范围较大(90~152 MPa)的特点,表明流体压力在石英—方解石形成时可能存在较大的波动。上述流体压力的波动可能受脉体形成时有机质裂解增压以及裂隙多次张开—愈合的综合影响。The CH4-H2O-NaCl immiscible fluid inclusions are widely applied to determine the trapping temperature and pressure in natural gas reservior,and different methods are used for gas end member inclusions and aqueous end member inclusions. Two end member fluid inclusions in the same FIA(Fluid Inclusion Assemblage)were applied to determine the trapping temperature and pressure of CH4-rich fluid inclusions hosted in quartz-calcite veins in Silurian Longmaxi black shales from Well YA,southern Sichuan basin. Results show that the trapping temperature and pressure of these two end member fluid inclusions exhibit simlar ranges,which are from 212.0 ℃ to 220.7 ℃ and from 90 MPa to 152 MPa,respectively. The large variation in fluid pressure may result from the hydrocarbon-generating pressurization and fracture opening and healing process.

关 键 词：CH4-H2O-NaCl体系 不混溶包裹体 捕获温度 捕获压力 四川盆地南部 页岩气 

分 类 号：TE122.3[石油与天然气工程—油气勘探]