赵丹枫,赵靖舟,陈莹
ZHAO Dan-feng,ZHAO Jing-zhou,CHEN Ying
摘要:
榆林气田和子洲气田是位于鄂尔多斯盆地东部的2个地质储量均超过1 000×108m3的上古生界大气田,二叠系山西组2段是榆林—子洲气田的主力产层。鄂尔多斯盆地榆林—子洲地区山2气藏烃源岩在区域上呈广覆式分布,成熟度高;储层致密,源储近邻,生储盖组合关系良好;存在众多小型岩性圈闭群,圈闭界限不明显,很难判断气藏的边界;全区大面积含气,区域上没有明显的气水倒置现象,砂体连通性差,非均质性强,不存在明显的边底水;气水分布复杂、分异不明显,现今构造对于气水分布及产出基本不起控制作用;气藏的成藏富集主要受烃源岩的生烃强度,储层物性及有效砂体厚度联合控制。通过研究气藏的成藏特征、天然气成藏富集规律,表明鄂尔多斯盆地榆林—子洲地区山2气藏符合准连续型气藏“储层致密,主要为源外成藏、近源储集,天然气呈准连续分布,圈闭介于有形与无形之间”的特征。
中图分类号:
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