Gas Geochemistry of Fluid Inclusions in Carbonate Reservoirs of Southwestern Sichuan Basin

YANG Rong-sheng; ZHANG Ming-jie; ZHANG Tong-wei; LI Li-wu; TANG Jun-hong

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).

Gas Geochemistry of Fluid Inclusions in Carbonate Reservoirs of Southwestern Sichuan Basin

1. State Key Laboratory of Gas Geochemistry, Lanzhou Institute of G eology, Chinese Academy of Sciences, Lanzhou 730000;

2. Geology Department, School of Natural Source and Environment, Lanzhou Univ ersity, Lanzhou 730000

Received Date: 2002-10-18

Rev Recd Date: 2003-03-14

Publish Date: 2003-09-10

Key words:

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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Gas Geochemistry of Fluid Inclusions in Carbonate Reservoirs of Southwestern Sichuan Basin

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