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地球学报  2006 

塔里木盆地早二叠世岩浆特征及其对油气成藏关系初探

DOI: 10.3975/cagsb.2006.03.07

Keywords: 火山活动,同位素年龄,伊利石,油气成藏期,塔里木盆地

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Abstract:

塔里木盆地早二叠世裂谷盆地阶段有一次强烈的岩浆活动,主要为玄武岩—中酸性凝灰岩喷发和大规模基性岩墙群的侵入,玄武岩K-Ar法同位素年龄为241~278Ma,而辉长岩的Sm-Nd法年龄为259Ma。火山活动产生的能量使得塔里木盆地内的寒武系—奥陶系烃源岩大量生烃并运移,自生伊利石K-Ar年龄测定数据显示哈得4石炭系油藏、塔中4CⅢ油藏油气充注时间为224~275Ma,与上述火成岩的活动时间相当。东河砂岩,一套深埋的优质储层,其形成的原因可能是二叠纪末油气的注入并导致其后期深埋时只有机械压实而无其他成岩作用的缘故。

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