塔里木盆地古城墟隆起奥陶系多期古流体活动证据及意义  

Evidences of Multi-Episodically Paleo-Fluid Flow and Its Significance in Ordovician of Guchengxu Uplift,Tarim Basin

作　　者：鲁子野 陈红汉[1,2] 丰勇[3] 吴悠[3] 熊万林 尚培 

机构地区：[1]中国地质大学构造与油气资源教育部重点实验室,湖北武汉430074 [2]中国科学院地质与地球物理研究所兰州油气资源研究中心,甘肃兰州730000 [3]长江大学地球科学学院,湖北荆州434023 [4]中海石油有限公司深圳分公司,广东广州510240

出　　处：《地球科学（中国地质大学学报）》2015年第9期1529-1537,共9页Earth Science-Journal of China University of Geosciences

基　　金：国家重点基础研究发展计划(973计划)项目(No.2012CB214804);国家"十二.五"重大科技专项项目(No.2011ZX05008-003-30);"构造与油气资源"教育部重点实验室开放基金项目(No.TPR-2014-20)

摘　　要：深部热流体活动与碳酸盐岩储层改造及油气成藏具有密切的关系.通过对塔里木盆地古城墟隆起奥陶系的11块样品的成岩观测和流体包裹体系统分析,识别出3期古流体活动.结合埋藏史,确定这3期流体活动的发生时间分别为:第1期以第1世代高角度裂缝及网状裂缝充填方解石为代表,推测与加里东晚期构造运动有关;第2期为构造-热液白云岩化流体,可能与塔里木盆地经历二叠纪末大规模的火山活动有关;第3期以充填于孔、缝中央的晚期方解石为代表,记录了晚期天然气充注事件,发生于喜山期.第1期流体活动伴随的构造运动导致了早期充注的油气沥青化;第2期流体活动对该区域的储层有建设性改造作用,所形成的鹰山组内幕储层成为了区内重要的勘探目的层;第3期流体活动记录了晚期天然气充注事件.因此,工区应以寻找喜山晚期天然气藏为主要勘探目标.There is significant relationship among deep paleo-fluid flows and modification of carbonate reservoirs and hydrocar-bon migration and accumulation.In this study,11 samples of the Ordovician in Guchengxu uplift have been employed to make diagenetic observation and fluid inclusion measurement.The analyzed results indicate that there are three events of paleo-fluid flows in the Middle and Lower Ordovician of Guchengxu uplift.（1）The first event of paleo-fluid flows is represented by the first generation of calcite cement filling in high angle and meshy fractures.It is estimated that the calcite cement precipitated during late Caledonian tectonic movement.（2）The second event of paleo-fluid flows is represented by the second generation of hydrothermal dolomites.It is estimated that the saddle dolomite precipitated during the Permian volcanic activities.（3）The third event of paleo-fluid flows is represented by the third generation of calcite cement filling in the central residual spaces of the fractures and vugs.It records the gas accumulation during the later Himalayan.The bitumen distributed along the side of first generation calcite cement implies that the early charging oil accompanied with the first event of paleo-fluid flow had been dam-aged.The second event of paleo-fluid flow played a role of dolomitization which was in favor of the Ordovician reservoir im-provement.The third event of paleo-fluid flow is associated with natural gas filling.It is concluded that the later Himalayan charging natural gases are the favorable exploration target in this area.

关 键 词：塔里木盆地 古城墟隆起 奥陶系 古流体活动 流体包裹体 石油地质 地层学 

分 类 号：P618.13[天文地球—矿床学]