准噶尔盆地西北地区断层内流体活动过程及对断层启闭性的影响

发布时间：2018-03-06 05:34

本文选题：流体活动　切入点：断层启闭性　出处：《石油实验地质》2017年04期 　论文类型：期刊论文

【摘要】：利用野外、钻井、测井和地球化学分析等资料,对准噶尔盆地西北地区断层内流体活动过程及对断层启闭性的影响进行了研究。准西北地区断层发生过4期流体活动:断层形成初期,滑动破碎带受力最为集中,破碎较为严重,一期幔源流体首先进入滑动破碎带,并不断析出矿物充填其中,物性变差;二期幔源流体在滑动破碎带物性较好的部位穿插运移,胶结形成的矿物与一期形成的矿物脉体将滑动破碎带封堵;三期盆源流体主要在物性较好的主动盘裂缝带内运移,少部分进入被动盘诱导裂缝带;四期大气降水在断层物性较好的主动盘诱导裂缝带和被动盘诱导裂缝带内活动,初期主要以溶蚀作用为主,后期胶结作用较为强烈。由于第三期盆源流体活动期间,往往也是盆内大规模油气排烃时期,流体中往往含有大量油气,因此油气的运移主要在主动盘诱导裂缝带内进行,其次为被动盘诱导裂缝带,滑动破碎带实际上起封闭作用,不输导油气。
[Abstract]:Using data from field, drilling, logging and geochemical analysis, The fluid activity process and its influence on the opening and closing of faults in northwestern Junggar Basin have been studied. There were four phases of fluid activity in the faults in the quasi-northwest area: in the early stage of fault formation, the stress in the slip fracture zone was the most concentrated. The first stage of mantle fluid enters the sliding fracture zone, and the mineral is filled in, the physical property of the second stage mantle fluid is poor, and the second stage mantle source fluid is intercalated and transported in the part with good physical properties in the sliding fracture zone. The mineral formed by the cementation and the mineral vein formed in the first stage seal the sliding broken zone, the third stage of the basin source fluid mainly migrates in the active disk fracture zone with good physical properties, and a few enter the passive disk-induced fracture zone. In the four periods of precipitation activity in active disk induced fracture zone and passive disk induced fracture zone with good physical properties of fault, dissolution is the main action at the initial stage, and the cementation is relatively strong in the later period. It is also the period of large-scale hydrocarbon expulsion in the basin, so the migration of oil and gas mainly takes place in the active disk-induced fracture zone, followed by the passive disk-induced fracture zone, and the sliding fracture zone actually plays a closed role. Oil and gas are not transported.
【作者单位】：中国石化胜利油田分公司;南京大学地球科学与工程学院;
【基金】：国家科技重大专项“准噶尔盆地碎屑岩层系油气富集规律与勘探评价”(2016ZX05002-002) 中国石化科技攻关项目“准噶尔盆地压扭性断裂体系控藏作用研究”(P14066)联合资助
【分类号】：P618.13

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