川西北地区泥盆系天然气沥青地球化学特征及来源示踪
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摘要
四川盆地西北部地区首次在中泥盆统观雾山组白云岩储层中获得工业气流,天然气来源备受关注。应用地球化学分析技术开展了泥盆系天然气、沥青、油砂及烃源岩地球化学特征综合研究。结果表明:泥盆系天然气是以烃类气体为主的二次裂解型干气,甲烷含量>94%,含痕量乙烷、丙烷及少量的氮气、二氧化碳等非烃气体;天然气δ~(13 )C_1值为-32.3‰～-31.9‰,δ~(13 )C_2值为-28.6‰～-28.4‰,δ~(2 )H_1值为-141‰～-138‰,为以腐泥型为主的混合型气。泥盆系井下沥青正构烷烃和烷基环己烷均具双主峰特征,生物标志化合物分布正常;野外剖面的沥青、油砂遭受强烈的生物降解作用。沥青、油砂与烃源岩的饱和烃、芳烃生物标志物特征对比表明,泥盆系油气来源于下寒武统筇竹寺组和下二叠统烃源岩,以筇竹寺组为主。研究成果对川西北地区天然气的进一步勘探部署和决策具有重要的指导意义。
Industrial gas flows have recently been discovered for the first time in the dolomite reservoirs from Mid-Devonian Guanwushan Formation,Northwest Sichuan Basin,and its natural gas sources have attracted much attention.Based on geochemical analysis,a comprehensive study is conducted on the geochemical characteristics of Devonian natural gas,bitumen,oil sand and source rocks.The results show that the Devonian natural gas is secondary cracking dry gas dominated by hydrocarbon gases,including more than 94% of methane content,trace ethane,propane,and a small amount of non-hydrocarbon gas such as nitrogen and carbon dioxide.Theδ~(13 )C1 value of nature gas is ranged from -32.3‰ to -31.9‰,δ~(13 )C2 values is from -28.6‰ to -28.4‰,andδ~(2 )H1 values is from -141‰ to -138‰,indicating the hybrid gas dominated by sapropelic type.The n-alkanes and alkyl cyclohexane of Devonian downhole bitumen are characterized by two main peaks,and the biomarkers are distributed normally.The bitumen and oil sands in the outcrop section are subjected to strong biodegradation.The comparison in the biomarkers characteristics of saturated hydrocarbon and aromatic hydrocarbons between bitumen,oil sands and source rocks show that the Devonian oil and gas is sourced from the Lower Cambrian Qiongzhusi Formation and Lower Permian source rocks,dominated by Qiongzhusi Formation.The research results have important guiding significance for developing exploration and deployment solutions for natural gas in Northwest Sichuan Basin.
Industrial gas flows have recently been discovered for the first time in the dolomite reservoirs from Mid-Devonian Guanwushan Formation,Northwest Sichuan Basin,and its natural gas sources have attracted much attention.Based on geochemical analysis,a comprehensive study is conducted on the geochemical characteristics of Devonian natural gas,bitumen,oil sand and source rocks.The results show that the Devonian natural gas is secondary cracking dry gas dominated by hydrocarbon gases,including more than 94% of methane content,trace ethane,propane,and a small amount of non-hydrocarbon gas such as nitrogen and carbon dioxide.Theδ~(13 )C1 value of nature gas is ranged from -32.3‰ to -31.9‰,δ~(13 )C2 values is from -28.6‰ to -28.4‰,andδ~(2 )H1 values is from -141‰ to -138‰,indicating the hybrid gas dominated by sapropelic type.The n-alkanes and alkyl cyclohexane of Devonian downhole bitumen are characterized by two main peaks,and the biomarkers are distributed normally.The bitumen and oil sands in the outcrop section are subjected to strong biodegradation.The comparison in the biomarkers characteristics of saturated hydrocarbon and aromatic hydrocarbons between bitumen,oil sands and source rocks show that the Devonian oil and gas is sourced from the Lower Cambrian Qiongzhusi Formation and Lower Permian source rocks,dominated by Qiongzhusi Formation.The research results have important guiding significance for developing exploration and deployment solutions for natural gas in Northwest Sichuan Basin.
引文
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