岩性油气藏 ›› 2025, Vol. 37 ›› Issue (4): 169183.doi: 10.12108/yxyqc.20250416
• 地质勘探 • 上一篇
李庚桐, 何登发
LI Gengtong, HE Dengfa
摘要: 坳拉槽的地质结构、形成演化及其对油气聚集和分布的控制作用是研究裂谷盆地的关键内容,对于克拉通盆地的深层—超深层油气勘探具有重要意义。通过对第聂伯—顿涅茨盆地(DDB)典型坳拉槽开展地质结构与油气地质条件研究,利用地震与钻井资料,结合盆内油气田统计数据,探讨其油气成藏条件。研究结果表明:①第聂伯—顿涅茨盆地坳拉槽同生裂谷期控制了源-储组合的发育;后裂谷期发育的褶皱及断层是圈闭形成的关键,盐构造(盐底辟及盐流运动等)不仅有利于油气的运移与聚集,还保证了盖层的封闭性。研究区可划分为断裂控油(气)运移成藏模式和盐构造相关油(气)成藏模式2种类型。②盆地内的油气资源主要储集在石炭系—下二叠统中。横向上受断层控制,集中分布于盆地中部的断陷带,而在南北断阶带分布较为零散。整体上,油气沿断裂带及其周边区域呈带状展布,具有东南产气、西北产油的分布特征。③坳拉槽的同生裂谷期沉积建造具有巨大潜力,断裂带对油气的运聚与空间分布具有极强的控制作用,坳拉槽作为克拉通盆地深层—超深层油气勘探的一个重要领域,可作为未来研究与勘探的重要方向。
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