石油与天然气地质 ›› 2016, Vol. 37 ›› Issue (5): 663-673.doi: 10.11743/ogg20160506

• [油气地质] • 上一篇    下一篇

塔中隆起两组走滑断裂对岩溶储层发育的控制机制

张艳萍1, 吕修祥2,3, 于红枫4, 敬兵4, 张春林1, 蔡俊1   

  1. 1. 中国石油大学(北京) 北京 102249;
    2. 中国石油大学(北京) 地球科学学院, 北京 102249;
    3. 中国石油大学(北京) 油气资源与探测国家重点实验室, 北京 102249;
    4. 中国石油 塔里木油田分公司 勘探开发研究院, 新疆 库尔勒 841000
  • 收稿日期:2016-04-06 修回日期:2016-06-06 出版日期:2016-10-08 发布日期:2016-11-07
  • 作者简介:张艳萍(1977-),女,博士,油气藏形成与分布、地震资料解释。E-mail:zhyphh@163.com。
  • 基金资助:
    国家重点基础研究发展规划(973计划)项目(2012CB214804);国家自然科学基金项目(41372146,41572100)。

Controlling mechanism of two strike-slip fault groups on the development of the Ordovician karst reservoirs in the Tazhong Uplift,Tarim Basin

Zhang Yanping1, Lyu Xiuxiang2,3, Yu Hongfeng4, Jing Bing4, Zhang Chunlin1, Cai Jun1   

  1. 1. China University of Petroleum, Beijing 102249, China;
    2. College of Geoscience, China University of Petroleum, Beijing 102249, China;
    3. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum, Beijing 102249, China;
    4. Research Institute of Petroleum Exploration and Development, PetroChina Tarim OilField Company, Korla, Xinjiang 841000, China
  • Received:2016-04-06 Revised:2016-06-06 Online:2016-10-08 Published:2016-11-07
  • Contact: 吕修祥(1963-),男,教授、博士生导师,油气藏形成与分布,E-mail:luxx@cup.edu.cn E-mail:luxx@cup.edu.cn

摘要: 走滑断裂对塔中隆起岩溶储层发育的控制机制一直缺乏深入研究。采用均方根振幅属性,对塔里木盆地塔中北斜坡奥陶系浅、中、深部的岩溶储层进行预测,发现大量岩溶储层继承性分布于北西向和北东向断裂所夹持块体的东北和西南角区域,特别是中古5和中古10块体的深层奥陶系尤为明显。沉积相和古地貌等无法解释这种现象,走滑断裂活动可提供合理解释:北西向断裂的右旋压扭,诱发北东向断裂的左旋走滑,断裂之间的块体的东北和西南角位于北西向和北东向走滑断裂的交汇区,断裂诱发的裂缝带交错发育;而断裂的走滑运动导致其东北和西南角形成局部拉张区、西北和东南角形成局部挤压区,岩石的抗拉强度远小于抗压强度,故拉张区极易拉张破裂成缝。裂缝提供溶蚀流体运移通道,也增加流体与岩石的接触面积,故走滑断裂夹持块体的东北角和西南角岩溶储层发育,表明走滑断裂是塔中岩溶储层发育的控制因素之一。

关键词: 走滑断裂, 岩溶储层, 碳酸盐岩, 奥陶系, 塔中隆起

Abstract: Controlling mechanisms of strike-slip faults on development of the Ordovician karst reservoirs in the Tazhong Uplift,Tarim Basin are poorly understood.Seismic attribute of root mean square amplitude was used to predict karst reservoir distribution in the shallow,middle and deep Ordovician on the North Slope of Tazhong Uplift.The results show that most of the karst reservoirs distribute with inheritance in the northeastern and southwestern ends of blocks which are bounded by the NW- and NE-trending faults,especially the deep Ordovician in ZG5 and ZG10 blocks.Such distribution characteristics cannot be interpreted by sedimentary facies and palaeogeomorphology,while strike-slip fault activity could provide a possible interpretation:Right-lateral compress-shear activity of the NW-trending faults induces left-lateral strike-slip activity of the NE-trending faults.The northeastern and southwestern ends of blocks bounded by the NW- and NE-trending faults are located in the intersection area of the NW- and NE-trending faults,where crossed fracture zones induced by faults are well developed.In addition,the strike-slip movements led to local extension in the northeastern and southwestern ends of blocks,while local compression in the northwestern and southeastern ends.Extensional fracturing of rock in local extension area is much easier than compressional fracturing of rock in local compression area for that the tensile strength of rock is much smaller than its compressive strength.The extensional fractures provide migration pathway to dissolution fluid and increases contact area of dissolution fluid and rock,so the northeastern and southwestern ends of blocks have well developed karst reservoirs.The research suggests that the strike-slip fault is one of controlling factors on development of karst reservoirs in the Tazhong Uplift.

Key words: strike slip fault, karst reservoir, carbonate rock, Ordovician, Tazhong Uplift

中图分类号: