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详细阐述了四川盆地海相碳酸盐岩大型气田天然气的地球化学特征,包括天然气的组成、碳同位素、凝析油的轻烃和储层沥青的生物标志化合物分布特征。认为该盆地海相碳酸盐岩三个大型气田中的天然气都不是碳酸盐岩自生的,而是来源于位于其上或其下的烃源岩,其中威远气田震旦系天然气主要来自下寒武统泥质烃源岩,卧龙河气田嘉陵江组天然气主要来自上二叠统煤系烃源岩,川东石炭系天然气主要来自志留系泥质烃源岩。
The geochemical characteristics of natural gas in the marine carbonate large-scale gas field in Sichuan Basin are described in detail, including the composition of natural gas, carbon isotopes, the light hydrocarbons of condensate oil and the distribution characteristics of biomarkers of reservoir bitumen. It is considered that the natural gas in the three large-scale gas fields of marine carbonate rocks in the basin is not carbonate spontaneous but originates from hydrocarbon source rocks located above or below it. The Sinian natural gas from Weiyuan gas field mainly comes from Lower Cambrian mudstone source rock and natural gas in Jialingjiang Formation of Wolonghe gas field are mainly derived from Upper Permian coal measure source rock. Carboniferous gas in eastern Sichuan mainly comes from Silurian mudstone source rock.