塔中低凸起北斜坡奥陶系碳酸盐岩储层特征及其勘探意义  

Characteristics and exploration significance of Ordovician carbonate reservoirs in the North Slope of Tazhong Lower Uplift,Tarim Basin

作　　者：陈轩[1] 刘银河[1] 林年添[2] 赵宗举[1] 张宝民[1] 杨海军[3] 潘文庆[3] 

机构地区：[1]中国石油勘探开发研究院提高石油采收率国家重点实验室,北京100083 [2]山东科技大学,山东青岛266510 [3]中国石油天然气股份有限公司塔里木油田分公司勘探开发研究院,新疆库尔勒841000

出　　处：《石油地球物理勘探》2011年第3期463-470,500+330,共8页Oil Geophysical Prospecting

基　　金：国家科技重大专项课题(批准号:2008ZX05000-004-001);中国石油重大研发项目(编号:070201)资助

摘　　要：塔中地区的构造演化史大致为:中加里东旋回晚期,塔中演化为前陆盆地的前缘隆起,形成了鹰山组顶部历时约12.8Ma的风化壳,NW走向的塔中Ⅰ号断裂带及相关次级断层开始活动,并伴随右行压扭,而且具有同沉积性质,控制了良里塔格组碳酸盐岩的生长,形成了桑塔木组和良里塔格组之间的淹没不整合;晚加里东运动期—早海西运动期,NE走向的右行走滑断裂继续活动;到二叠纪时期,塔里木盆地火山活动频繁,在塔中47井以及塔中35井区形成了两个规模较大的岩株,并伴随有NW走向的岩浆侵入。伴随构造演化过程在奥陶系碳酸盐岩中形成了三种受构造影响的储层类型——与走滑断裂相关的岩溶塌陷储集体、与同沉积逆断裂相关的良里塔格组台内滩储层、与岩浆热液相关的储集体。构造活动是形成碳酸盐岩优质储层的基础,这三类储集体是不同构造活动的不同表现形式,它们在时间上继承,在空间上叠置甚至重合,相互影响,最终形成一种相对独立的碳酸盐岩岩溶缝洞系统,具有重要的勘探价值。In this work,we divide the tectonic evolution of Tazhong area into three periods: the late middle-Caledonian cycle period,the late Caledonian kinematic period to the early Hercynian kinematic period and the Permian period.In the late middle-Caledonian cycle period,Tazhong area was evolved into the frontal uplift of foreland basin,which shaped the weathering crust with the period of 12.8Ma in the upper of Yingshan Formation.Tazhong Fault-belt No.1 oriented NW and its related secondary order faults accompanied with the right lateral extrusion started to play,which controlled the carbonate growing of Lianglitage Formation and formed the drowning unconformity between Lianglitage Formation and Sangtamu Formation.From the late Caledonian kinematic period to the early Hercynian kinematic period,the right lateral slip fault toward NE continued to move on.In the Permian period,the frequent volcano activity in Tarim Basin resulted in two large scale stocks in Tazhong Well 45 and Well 35,which associated with NE oriented magmatic intrusion.Through this tectonic evolution,it was identified tree types of reservoirs in Ordovician:the strike-slip faults-related paleocarst collapse reservoirs,the synsedimentary reverse faults-related inter-platform beaches reservoirs of Lianglitage formation and the igneous rock activity-related reservoirs.Carbonate high-quality reservoirs were formed by tectonic activity.These three types' reservoirs were different performances of different tectonic activity.They developed with the time and overlapped in the space.They were influenced with each other,which presented a relative independent carbonate paleokarst-fracture-cave system and indicated an important significance for exploration.

关 键 词：塔中低凸起 走滑断裂 同沉积逆断裂 岩浆热液 岩溶塌陷 台内滩 缝洞系统 

分 类 号：P631[天文地球—地质矿产勘探]