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川东北普光气田和毛坝气田高含硫化氢气藏中储层沥青显微镜下光学特征、沥青反射率值及S/C原子比均具有明显的非均质性,这说明在由古油藏原油高温热裂解形成现今气藏的过程中硫酸盐热化学还原(TSR)反应不充分。同时,飞仙关组和长兴组气藏中硫化氢相对含量与烃类气体组分及碳同位素之间没有明显的相关性,进一步说明TSR反应还没有明显波及到烃类气体。这一研究结果表明这些气藏中烃类气体组分及碳同位素没有受到TSR反应的明显影响,因而能够基本反映母源性质和演化程度,在天然气成因分析及气源对比研究时可能不需要经过人们以往所建议的大幅度校正,这对于该地区天然气藏的成因与成藏机制解剖具有重要的指导意义。
Optical characteristics, asphaltene reflectivity and S / C atomic ratio have obvious heterogeneity in the reservoir of high hydrogen sulfide gas in the Puguang gas field and the Maoba gas field in northeastern Sichuan, Sulfate thermochemical reduction (TSR) reactions are insufficient during the pyrolysis of today’s gas pools. At the same time, there is no obvious correlation between the relative content of hydrogen sulfide and hydrocarbon gas components and carbon isotopes in the Feixianguan Formation and Changxing Formation gas reservoirs, which further indicates that the TSR reaction has not obviously affected the hydrocarbon gas. The results of this study indicate that hydrocarbon gas components and carbon isotopes in these reservoirs are not significantly affected by the TSR reaction and thus can basically reflect the nature and evolution of maternal sources and may not be necessary for gas genesis analysis and gas source contrast studies The substantial correction proposed by people in the past has important guiding significance on the genesis and mechanism of gas accumulation in natural gas reservoirs in the area.