内蒙古西部银额盆地石炭系—二叠系油气地质条件与勘探发现

发布时间：2018-03-07 10:04

  本文选题：内蒙古西部　切入点：阿拉善盟　出处：《中国地质》2017年01期 　论文类型：期刊论文

【摘要】：通过开展石炭纪—二叠纪盆地形成演化、沉积充填、烃源岩分布与地球化学特征、烃源岩热演化史,以及石炭系—二叠系沉积之后的构造沉积演化与油气保存条件的综合研究,提出了银额盆地为石炭纪—二叠纪与中生代叠合盆地的新认识,查明石炭系—二叠系为陆内裂谷盆地沉积产物,发育多套厚度大、有机质丰度中等—高、干酪根类型以Ⅱ型为主、演化程度中等—高的良好烃源岩,明确了其油气地质条件。优选的油气远景区经国土资源部竞争性出让,企业加大勘探投入,于务桃亥勘查区拐子湖凹陷首钻(拐参1井)获初期日产原油51.67 m3、天然气7290 m3的工业油气流,温图高勒苏木勘查区哈日凹陷首钻(延哈参1井)获日产天然气9.15万m3(无阻流量)的工业气流及少量凝析油,实现了1955年勘探以来油气的重大突破。通过对2口油气突破井产层时代的厘定,以及油气源的对比,明确了油气产层时代为二叠纪,指明了石炭系—二叠系良好的油气资源前景,应为区内油气勘探的主要目的层。
[Abstract]:The formation and evolution of Carboniferous and Permian basins, the sedimentary filling, the distribution and geochemical characteristics of source rocks, the thermal evolution of source rocks, the tectonic sedimentary evolution after Carboniferous and Permian deposits and the preservation conditions of oil and gas are studied. A new understanding that the Yinyu basin is a Carboniferous Permian and Mesozoic superimposed basin is proposed. It is found that the Carboniferous Permian is a sedimentary product of the intracontinental rift basin with large thickness and medium to high organic matter abundance. The main type of kerogen is type 鈪，

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