岩性油气藏 ›› 2025, Vol. 37 ›› Issue (5): 2233.doi: 10.12108/yxyqc.20250503
• 地质勘探 • 上一篇
崔海峰1, 韩小锋1, 黄元溢2, 张慧元1
CUI Haifeng1, HAN Xiaofeng1, HUANG Yuanyi2, ZHANG Huiyuan1
摘要: 银额盆地油气勘探程度较低,油气分布规律和勘探方向有待进一步明确。通过分析银额盆地油气勘探历程,梳理了不同阶段的勘探进展和存在问题,总结了钻探认识,明确了油气藏类型和下一步勘探方向。研究结果表明:①银额盆地经历了普查、综合评价、重点坳陷勘探和整体认识4个阶段,重点以白垩系—侏罗系与石炭系—二叠系为目的层,盆地的油气成藏条件研究逐步深入,已取得较大进展。②普查阶段主要应用重磁、电法和地震等手段,圈定了重点凹陷的分布范围,部署二维地震。综合评价阶段以中生界为目的层,划分了构造单元,按照断裂构造高点控藏模式发现了查干、路井凹陷的低产油流。重点坳陷勘探阶段分别以中生界和上古生界为目的层,在哈日凹陷、拐子湖和天草凹陷分别实现了工业油气流发现,但是产油层系归属存在中生代和晚古生代争论。盆地整体认识阶段厘清了盆地现今结构,指出石炭系—二叠系为中生代断陷盆地的褶皱基底,建立了中生代岩性油气藏和前中生代古潜山油气成藏模式,油气主要分布在面积不大的各个中生代箕状断陷缓坡下部,资源相对分散。③银额盆地是发育在海西期造山带褶皱基底之上的中生代断陷盆地,主要油气产层和油气来源为中生界,上古生界经历不同程度的变形变质作用,油气资源潜力有限;中生界白垩系、侏罗系的厚层湖相泥岩、泥页岩等非常规油气藏是盆地下一步的重点攻关目标。
中图分类号:
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