岩性油气藏 ›› 2025, Vol. 37 ›› Issue (4): 8494.doi: 10.12108/yxyqc.20250408
• 地质勘探 • 上一篇
江山1,2, 唐永建1,2, 焦霞蓉3, 李文亮4, 黄成4, 王泽5
JIANG Shan1,2, TANG Yongjian1,2, JIAO Xiarong3, LI Wenliang4, HUANG Cheng4, WANG Ze5
摘要: 塔里木盆地顺北油田4号断裂带奥陶系断控体碳酸盐岩凝析气藏采出程度低,地层压力下降快。采用数值模拟方法研究了顺北油田4号断裂带奥陶系凝析气藏剩余气分布特征及主控因素,并总结了凝析气藏剩余气分布模式。研究结果表明:①顺北油田发育各种各样的小尺度走滑断裂带,走滑断裂形成了断控型储层,埋深较大,有效储集空间以断层空腔、裂缝等为主。断控体储层沿走滑断裂带呈条带状分布,垂直断裂带方向发育由基岩-裂缝带-洞穴带-裂缝带-基岩带有序排列构成的多组缝洞集合体,即栅簇结构。②研究区利用单井开发的储集体剩余气具有零星分布特征:当储集体2个断裂面不连通时,一块断裂面凝析气被动用,另一块断裂面则形成剩余气;当储集体为多个孤立的断控体时,剩余气呈块状分布;当储集体受底水影响强烈时,剩余气被底水封堵,分布于储集体顶部。多井开发的储集体剩余气具有成片分布特征:当储集体存在明显气驱高速通道时,通道侧缘存在大量滞留型剩余气;当注采井之间连通性较好时,注入气呈活塞式推进,剩余气连片分布于生产井周围。单井开发的剩余气分布主要受地质因素及水动力控制,多井开发的剩余气分布则主要受注采条件及地质因素控制。③研究区断控型凝析气藏剩余气分布具有两大类7种模式,分别为单井类的孤立型、构造控制型、致密封堵型、底水封堵型和多井类的孤立型、气驱通道附近滞留型、注采控制型。
中图分类号:
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