天然气地球科学 ›› 2020, Vol. 31 ›› Issue (11): 16371647.doi: 10.11764/j.issn.1672-1926.2020.05.004
魏洪刚1,2(),陈燃3(),牟必鑫1,2,陈杨1,2,雷玉雪1,2,何伟1,2
Hong-gang WEI1,2(),Ran CHEN3(),Bi-xin MOU1,2,Yang CHEN1,2,Yu-xue LEI1,2,Wei HE1,2
摘要:
西昌盆地位于四川盆地西侧,油气勘探程度低。最近昭地1井油气调查井在上三叠统白果湾组获得较好的油气显示,为研究西昌盆地油气资源潜力提供了难得条件。通过对昭地1井天然气组分、碳同位素组成展开地球化学分析,讨论了气源,再结合邻区油气基本条件对比分析了勘探潜力。结果表明,昭地1井天然气组分以甲烷为主;天然气δ13C1值介于-48.74‰~-41.25‰之间;δ13C2值介于-29.77‰~-28.96‰之间;δ13C3值介于-25.81‰~-21.91‰之间。天然气组分和碳同位素特征显示为典型油型气。气源分析结果显示昭地1井天然气来源于白果湾组,为同源不同成熟度天然气混合气藏。西昌盆地油气基础地质条件与川西坳陷具有诸多相似之处,可对比性好,天然气资源潜力较大。
中图分类号:
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