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银根―额济纳旗盆地天草凹陷构造-沉积体系演化及油气成藏条件分析

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Keywords: 天草凹陷,构造-沉积演化,成藏要素,有利区带

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Abstract:

天草凹陷位于银根―额济纳旗盆地白垩纪断陷盆地群的西北部,经历了早白垩世断陷发生、发展阶段,晚白垩世坳陷阶段,第三纪到第四纪挤压抬升等主要的构造演化发展阶段。其中,第一阶段是形成盆地沉积建造的主要时期,沉积了2000~3000m的早白垩世沉积,其间经历了两次大的湖侵、湖退过程,对应沉积了两套浅湖-半深湖相烃源岩和扇三角洲相砂体。天草凹陷油源、储层、保存、圈闭配套匹配以及油气运聚等油气成藏条件好,用类比法和盆地模拟法计算的凹陷总资源量的期望值为0.89亿吨。下白垩统巴音戈壁组上部是主要的含油层系,位于凹陷东西两侧的巴勒断阶带、哈尔构造带是天草凹陷油气勘探的重要领域。

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