塔里木盆地东部古生代中期伸展构造的发现及其地质意义  

The Mid-Paleozoic extensional structures revealed in the eastern Tarim Basin and their geological significance

作　　者：杨海军[1] 李曰俊[2] 马德波[3] 魏红兴[1] 李洪辉[3] 罗彩明[1] 赵岩 段云江[1] 黄彤飞 赵甜玉 Yang Haijun;Li Yuejun;Ma Debo;Wei Hongxing;Li Honghui;Luo Caiming;Zhao Yan;Duan Yunjiang;Huang Tongfei;Zhao Tianyu(Tarim Oil-Field Company,PetroChina,Korla,Xinjiang 841000;Institute of Geology and Geophysics,Key Laboratory of Petroleum Resource Research,Chinese Academy of Sciences,Beijing 100029;Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083;Kexin Petroleum Science&Technology Service Co.,Ltd.,Korla,Xinjiang 841000)

机构地区：[1]中国石油天然气股份有限公司塔里木油田分公司,新疆库尔勒841000 [2]中国科学院地质与地球物理研究所,油气资源研究重点开放实验室,北京100029 [3]中国石油天然气股份有限公司勘探开发研究院,北京100083 [4]科新石油技术服务有限责任公司,新疆库尔勒841000

出　　处：《地质科学》2022年第3期633-652,共20页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家重点研发计划项目“塔里木盆地盐下超深层油气分布规律及有利区带评价”(编号:2019YFC0605505);中国石油天然气股份有限公司科学研究与技术开发项目“塔里木盆地震旦系白云岩储层建模与有利区带评价”(编号:2020D-5010-28);中国石油塔里木油田科技项目(编号:041019120072)资助。

摘　　要：通过地震资料解释,首次在塔里木盆地东部发现了古生代中期的伸展构造。它们是一系列正断层,以及由这些正断层组合成的雁列状张扭性断层带。正断层走向近N-S;雁列状张扭性断层带分两组,走向分别是NE-SW和NW-SE,构成一个共轭体系,显示近E-W向的拉张作用。根据断层生长指数、断层断开的地层单元和断层断距变化的解析,这些伸展构造的形成时间是中志留世—中泥盆世。它们是原特提斯阿尔金早古生代碰撞造山带的碰撞后构造,是判定塔里木地块—柴达木地块碰撞造山作用结束时间的重要证据。On the basis of careful seismic interpretation, the Mid-Paleozoic extensional structures were discovered for the first time in the East Tarim Basin. They are normal faults and their constituent echelons. The normal faults strike in nearly N-S direction. They form two groups of transtensional fault zones, which strike in NE-SW and NW-SE respectively forming a conjugate system showing nearly E-W extension. According to the fault growth indexes, age of the strata cut by the faults and the change of the fault displacements, these extensional structures were formed in Middle Silurian-Middle Devonian. They are the post-collision structures of the Altun Early Paleozoic collisional orogenic belt which is a Proto-Tethyan suture. It is also a key evidence for timing the end of the Tarim-Qaidam collision.

关 键 词：正断层 张扭性断层带 中志留世—中泥盆世 碰撞后构造 塔里木地块—柴达木地块碰撞 原特提斯 阿尔金山造山带 塔里木盆地 地震解释 

分 类 号：P542[天文地球—构造地质学]