岩性油气藏 ›› 2015, Vol. 27 ›› Issue (6): 4854.doi: 10.3969/j.issn.1673-8926.2015.06.007
崔 殿
Cui Dian
摘要:
克夏断裂带是准噶尔盆地西北缘的一个二级构造单元,由南向北发育有克拉玛依断裂、南白碱滩断裂、百口泉断裂、百乌断裂及夏红北断裂共 5 条主要的一级断裂以及伴生的多条次级断裂。 在筛选钻遇断裂探井的基础上,通过岩心取样进行岩石薄片及扫描电镜分析,发现这 5 条一级断裂的胶结物类型明 显不同,由南向北依次为克拉玛依断裂的绿泥石和浊沸石、南白碱滩断裂的方解石、百口泉断裂的方解石和黏土矿物、百乌断裂的方解石和铁方解石以及夏红北断裂的铁白云石和菱铁矿。 由此可见,克夏断裂带成岩作用阶段由南向北逐渐趋向晚期,且经历了胶结—溶蚀—再胶结的过程。 结合断层活动性分析和断 裂带内流体包裹体均一温度测试,认为这是由于断裂活动期由南向北逐渐提前,进而影响断裂内地下流体活动期次导致的。 不同断裂的胶结封闭作用和流体活动差异性可进一步影响各断裂的油气藏分布。
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