四川盆地东北部飞仙关组储层流体包裹体特征  

The characteristics of fluid inclusions in Feixianguan Formation,northeastern Sichuan Basin,China

作　　者：夏茂龙[1,2] 范毅 江蓉蓉[2,3] 张婷[4] 洪海涛 王一刚 刘鑫[1,2] 陈文 

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610041 [2]成都理工大学能源学院,四川成都610059 [3]中国石化西南油气公司勘探开发研究院,四川成都610081 [4]南京大学地球科学系,江苏南京210093

出　　处：《石油学报》2012年第A02期74-81,共8页Acta Petrolei Sinica

基　　金：国家重大科技专项(2011ZX05004-005与2011ZX05007-003);中国石油天然气股份有限公司重大科技专项(2008E-0705)资助

摘　　要：四川盆地东北部下三叠统飞仙关组鲕滩气藏储层成岩矿物中的流体包裹体主要有盐水溶液包裹体、含烃包裹体和烃类包裹体3大类。拉曼光谱成分测试表明,气相烃类包裹体以含CH4为主,平均含量为82.94%;H2S平均含量为7.29%,但H2S含量变化较大,为2.17%～13.08%,包裹体中的H2S平均含量较现今气藏低一些,且变化范围更大,为气藏不同演化阶段所捕获。含烃气液两相包裹体中H2O、CH4和H2S的含量变化都比较大,为盐水溶液和天然气在不混溶条件下捕获。高含H2S的含烃包裹体和气态烃包裹体基本不含CO2,这一现象与TSR反应产生CO2和H2S,CO2参与储层溶蚀作用而被大量消耗有关。CO2参与储层溶蚀作用,碳酸盐沉淀作用加强,白云石、方解石在孔隙及裂缝中结晶沉淀,并捕获以含CH4和H2S为主、不含或微含CO2的包裹体,因此川东北飞仙关组气藏具有CO2含量相对H2S显著亏损的特征。The fluid inclusions that occurred in diagenetic minerals of oolitic beach gas reservoirs in the Lower Triassic Feixianguan Formation in northeastern Sichuan mainly included saline aqueous inclusions, hydroearbonaceous inclusions, and hydrocarbon inclu sions. Raman spectra showed that the gas hydrocarbon inclusions were mainly comprised of CH4, accounting for 82.94% on average. The average content of H2S was 7.29%, ranging from 2.17% to 13.08%. The average content of H2S in fluid inclusions was lower than that in the present gas reservoirs, varying in a larger range and captured by gas reservoirs in different evolutionary stages. In the hydroearbonaeeous two-phase gas-liquid inclusions, the contents of H2 O, CH4 and H2 S substantially varied and were captured by saline aqueous solution and natural gas under immiscible conditions. The hydrocarbonaceous inclusions and gas hydrocarbon inelu sions with abundant H2 S generally lacked CO2. The low content of CO2 was closely related to the production of CO2 and H2 S in the thermochemical sulfate reduction（TSR） and substantial CO2 consumption in the reservoir dissolution. Due to the involvement of CO2 in reservoir dissolution and enhancement of carbonate precipitation, dolomite and calcite crystals precipitated in pores and cracks, further capturing fluid inclusions with high contents of CH4 and H2S and low content or lack of CO2. Therefore, the gas reservoirs of Feixianguan Formation in northeastern Sichuan were characterized with significant CO2 losses relative to the H2 S content.

关 键 词：飞仙关组 流体包裹体 均一温度 拉曼光谱 TSR反应 储层溶蚀作用 四川盆地 

分 类 号：TE112.115[石油与天然气工程—油气勘探]