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OALib Journal期刊
ISSN: 2333-9721
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潍北凹陷孔店组烃源岩生烃史与油气成藏期分析
Keywords: 二次生烃,成藏期次,流体包裹体,生烃史,潍北凹陷
Abstract:
？为深入认识渤海湾盆地潍北凹陷油气藏的形成过程和油气分布，利用ies-petromod盆地模拟和流体包裹体研究方法对潍北凹陷孔店组烃源岩的生烃史和油气藏形成时间与期次进行了分析。结果表明，潍北凹陷发育孔二段上,中,下3套烃源岩，存在北部深洼区和东南部2个沉降中心，以北部深洼区为主体，具有2次生烃过程：沙四段沉积中期至沙河街期构造运动为第一次生烃，生烃中心以北部洼陷带为主，且3套烃源岩均已进入成熟生烃阶段，生烃持续时间长，生烃贡献量大|后期东营期构造运动的剥蚀使得生烃作用基本停滞，仅在晚期沉降量大于剥蚀量的西北部地区于馆陶中后期存在二次生烃。该区已发现的油气藏具有明显的2期成藏特征：沙四中期至沙河街期构造运动是油气的第一期充注，研究区大部分的油气藏形成于该时期，受各项地质条件的限制，分布在保存条件较好的灶户鼻状带|馆陶中后期至今为第二期充注，仅在二次生烃区及其附近形成油气聚集，是寻找深部天然气的有利地区。？
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