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Study on Differentiation of Secondary Hydrocarbon Generation for the Carboniferous-Permian Source Rocks in the Eastern Linqing Depression
Author(s): 
Pages: 179-188
Year: Issue:  1
Journal: Acta Sedimentologica Sinica

Keyword:  coal-bearing hydrocarbon source rocksecondary hydrocarbon generationMulti-cyclic Superimposed Basineastern Linqing Depression;
Abstract: 受盆地多旋回叠加和反转演化控制,临清坳陷东部石炭—二叠系含煤系地层烃源岩经历了二次生烃过程,并在空间上表现出强烈的差异性。通过对这套烃源岩生烃史模拟结果表明,石炭—二叠系烃源岩于早中三叠世进入生烃门限,随后印支运动造成全区生烃中止,中新生代烃源岩再次深埋,发生二次生烃作用。不同井区二次生烃在时间和空间上存在差异性,洼陷带发育三个"二次生烃"阶段,生烃高峰期发生在新生代,凸起带发育两个"二次生烃"阶段,生烃高峰期发生在中生代,隆起区尚未发生二次生烃。二次生烃早期生成的烃类基本遭受破坏,晚期生成的烃类具备成藏条件,是勘探的主要目标。现今洼陷带烃源岩已进入成熟—高成熟阶段,成为晚期煤成气藏的气灶。
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