吉林大学学报(地球科学版) ›› 2021, Vol. 51 ›› Issue (4): 1006-1018.doi: 10.13278/j.cnki.jjuese.20200122
林波1,2, 云露3, 张旭4, 肖重阳1, 况安鹏1, 徐学纯2, 曹自成4
Lin Bo1,2, Yun Lu3, Zhang Xu4, Xiao Chongyang1, Kuang Anpeng1, Xu Xuechun2, Cao Zicheng4
摘要: 近年来在顺北地区1号和5号走滑断层带上获得了重大的油气突破,证明了在塔里木盆地内发育的小尺度走滑断层对断控油气藏具有控藏、控储的特征。该类走滑断层在剖面上贯穿多套古生代地层,纵向结构复杂,在空间上为深层线性走滑叠加浅层雁列正断层的构造样式,钻井揭示在断层带上不同分段的井产能差异明显,表明走滑断层在奥陶系碳酸盐岩顶界面的分段性对油气成藏具有重要的控制作用。本文选取顺北5号断层中北段作为研究对象,针对深层不同层系线性走滑断层分段特征差异明显这一特征,基于不同尺度下断层的断距与分段长度之间的相关性及多断层演化理论,提出了利用沿着走向等间距统计断层的垂向断距变化的方法对深层线性走滑断层开展分段性研究工作,该方法综合了断层的活动强度、演化程度和剖面构造形态来分析断层的分段特征,适用于不同性质的断层分段性特征研究。研究表明5号断层中北段在奥陶系碳酸盐岩顶界面可划分为14段,在寒武系膏盐岩层顶界面可划分为10段,两个层系的断层分段性在空间上具有继承性与差异演化的特点,其中寒武系膏盐岩滑脱构造中的膏盐逃逸对油气的疏导具有破坏作用,奥陶系碳酸盐岩顶断层活动强度、分段叠接样式、断层分段不同位置对断控缝洞型储层发育规模具有重要的控制作用,揭示了断层在平面上的分段特征及纵向结构对断控缝洞型油气成藏具有重要的控制作用。
中图分类号:
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