岩性油气藏 ›› 2021, Vol. 33 ›› Issue (1): 161174.doi: 10.12108/yxyqc.20210115
卢恩俊1,2,3, 柳少波1,2,3, 于志超1,2,3, 鲁雪松1,2,3, 成定树4
LU Enjun1,2,3, LIU Shaobo1,2,3, YU Zhichao1,2,3, LU Xuesong1,2,3, CHENG Dingshu4
摘要: 柴达木盆地英雄岭南带断裂发育,但断裂控制油气成藏的规律不太清楚。通过重新解释该地区地震剖面,分析了5条主要断裂:狮子沟断裂、Ⅰ号断裂、Ⅱ号断裂、油砂山断裂、Ⅺ号断裂,研究了断裂级次、构造样式、活动强度和演化过程,以及通过分析英雄岭南带油藏生物标志物特征和油气充注期次,探讨了断裂对油气成藏的控制作用。结果表明:①Ⅰ号、Ⅱ号、Ⅺ号断裂属于软弱层(膏盐岩+泥岩)之下断裂,形成于古近纪,其中Ⅱ号、Ⅺ号断裂由多条断裂叠加生长形成,狮子沟与油砂山断裂属于软弱层之上断裂,形成于新近纪,由单一断裂生长形成。②浅层构造带油气是深层油气向上运移的结果,控藏断裂的活动性与油气生烃期和圈闭的形成期相匹配。③断裂控藏演化分为3个阶段:下干柴沟组上段沉积期,基底断裂控制烃源岩形成;下油砂山组沉积期,滑脱断裂控制低熟油气成藏;上油砂山组沉积期,滑脱断裂控制成熟油气成藏,同时对早期低熟油气藏进行改造。不同断裂活动特征的差异性是造成英雄岭南带成藏差异性的主控因素之一。
中图分类号:
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