【摘 要】
：
四川盆地川中隆起带震旦系—寒武系探明天然气储量超过万亿立方米,发现中二叠统栖霞组气藏,洗象池组、茅口组、玄武岩组、长兴组等层系获工业气流,不同层系气藏天然气地球化学特征存在明显差异.基于大量新获气井天然气组分、碳同位素、氢同位素等分析实验数据,系统研究了川中隆起带天然气成因及成藏特征,明确了下一个万亿立方米级重点勘探领域.研究结果表明:(1)震旦系、寒武系和二叠系天然气均是以烃类气体为主且干燥系数大于0.997的干气,属于原油裂解气.绝大多数二叠系天然气C2H6含量、δ13C2、δ2HCH4与源自下寒武统
【机 构】
：
中国石油勘探开发研究院;中国石油天然气集团有限公司天然气成藏与开发重点实验室;中国石油西南油气田公司勘探开发研究院;中国石油勘探开发研究院
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四川盆地川中隆起带震旦系—寒武系探明天然气储量超过万亿立方米,发现中二叠统栖霞组气藏,洗象池组、茅口组、玄武岩组、长兴组等层系获工业气流,不同层系气藏天然气地球化学特征存在明显差异.基于大量新获气井天然气组分、碳同位素、氢同位素等分析实验数据,系统研究了川中隆起带天然气成因及成藏特征,明确了下一个万亿立方米级重点勘探领域.研究结果表明:(1)震旦系、寒武系和二叠系天然气均是以烃类气体为主且干燥系数大于0.997的干气,属于原油裂解气.绝大多数二叠系天然气C2H6含量、δ13C2、δ2HCH4与源自下寒武统筇竹寺组烃源岩的寒武系天然气相似;上震旦统灯影组天然气C2H6含量低、δ13C2重、δ2HCH4轻;GS19栖霞组气藏天然气C2H6含量高、δ13C2轻、δ2HCH4轻.C2H6与δ13C2差异主要与成熟度有关,δ2HCH4主要受原始母质沉积水介质盐度影响.(2)安岳气区与太和气区聚集了不同演化阶段的原油裂解气,其中,安岳气区天然气 δ13C比太和气区重,主要聚集原油晚期阶段的裂解气,太和气区聚集早期—晚期裂解气.(3)震旦系—二叠系气藏具有单源和双源聚集模式.寒武系气藏和GS19栖霞组气藏为单源聚集模式,烃源岩分别为筇竹寺组和龙马溪组,灯影组气藏和其他二叠系气藏为双源供烃成藏模式,除均有筇竹寺组烃源岩贡献外,分别还有震旦系烃源岩和二叠系烃源岩的贡献.研究认为,不同时代烃源岩贡献比例大小是造成不同层系气藏天然气地球化学特征差异的主要原因,太和气区多层叠置连片的优质储层紧邻烃源灶或处于古油藏范围,具备万亿立方米级资源规模,勘探潜力大.
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