Gas Geochemistry of Fluid Inclusions in Carbonate Reservoirs of Southwestern Sichuan Basin
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摘要: 采用真空磁力破碎包裹体与质谱计在线连接的方法,分析了四川盆地西南威远气田、资阳气田和隆昌气田不同时代碳酸盐岩储层中流体包裹体的化学成分和碳同位素组成,并结合储层地质特征,研究了储层流体的来源。研究表明 :流体包裹体气体成分主要以CH4和CO2 为主,不同时代的储层原岩流体包裹体的成分明显不同,同一时代储层原岩及次生脉体中气体的含量变化不一。二叠系储层原岩流体包裹体气体成分以甲烷为主,CH4含量一般在80 %以上,而震旦系储层原岩则以CO2 为主,CO2 含量大于 6 0 %。震旦系储层沥青脉中的包裹体CH4含量最低,储层原岩包裹体CH4含量次之,次生白云岩及方解石脉体中的包裹体CH4的含量均大于前两者;而CO2 的含量却刚好于此相反。依据储层原岩、次生矿物脉体和沥青脉中包裹体CH4和CO2 碳同位素组成的变化,讨论了二叠系 (P3 12A、P3 12B)和震旦系 (Z4、Z3、Z2 )不同层段储层中油气侵入的方式和过程。Abstract: The chemical components and isotopic compositions of fluid inclusions in differe nt carbonate reservoirs in Weiyuan,Ziyang and Longchang gas fields in the southwest of Sichuan Basin are measured by means of on-line mass spectrometry connected with magnetic force crushing equipment to break fluid inclusions unde r vacuum. Combining the geological characteristics of reservoirs, the sources of fluids of in the reservoirs are considered. Results are attained concerning tha t CH4 and CO 2 are mainly gas compositions in the fluid inclusions; the compo nents of fluid inclusions from reservoir protoliths in different ages are differ ent and the gas contents vary differently in the reservoir protoliths and the secondary veins in the same geological strata. CH 4 is the predominant gas composition in fluid inclusions trapped in reservoi r protoliths of Permian System, which is generally higher than 80%; While in Si nian system, CO 2 is the mainly gas composition, with the contents of above 60%. In the inclusions lying in asphalt veins in Sinian system, the contents of CH 4 are the lowest ones and those in reservoir protoliths are the second lowest. The contents of CH 4 in inclusions of the secondary dolomite veins are higher than both of the asphalt veins and reservoir protoliths, while the contents of CO 2 in this series are just on the contrary. According to the diversity of carb on isotopic components of CH 4 and CO 2 in reservoir protoliths, secondary min eral veins and asphalt veins respectively, this paper sheds light onto the intru sion pattern and process of petroleum and natural gas in different strata of res ervoirs in Permian system (P3 12A 、P3 12B ) and Sinia n system (Z 4、Z 3、Z 2).
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