天然气地质学

塔里木盆地前寒武纪古构造格局及其对下寒武统烃源岩发育的控制作用

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  • 1.同济大学海洋与地球科学学院,上海 200092;2.中国石油化工股份有限公司石油勘探开发研究院无锡石油地质研究所,江苏 无锡 214000;
    3.中国科学院油气资源研究重点实验室,甘肃 兰州 730000
杨鑫(1985-),男,湖北黄冈人,博士后,主要从事含油气盆地构造分析研究. E-mail:xyang85@126.com.

收稿日期: 2013-09-07

  修回日期: 2013-12-19

  网络出版日期: 2014-08-10

基金资助

国家科技重大专项(编号:2011ZX05005-002-04-01)资助.
 

Palaeotectonics Pattern in Pre-Cambrian and Its Control on the Deposition of the Lower Cambrian Source Rocks in Tarim Basin

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  • 1.School of Ocean and Earth Science,Tongji University,Shanghai 200092,China;2.Wuxi Institute of Petroleum
    Geology,SINOPEC,Wuxi214000,China;3.Key Laboratory of Petroleum Resources Research,Institute
    of Geology andGeophysics,Chinese Academy of Sciences,Lanzhou 730000,China

Received date: 2013-09-07

  Revised date: 2013-12-19

  Online published: 2014-08-10

摘要

塔里木盆地寒武系沉积前的古构造格局对于寒武纪早期快速海侵形成的优质烃源岩的分布有显著控制作用。结合钻井和露头资料研究了塔里木盆地南华纪—震旦纪的早期演化过程及寒武系沉积前的古构造格局,进而探讨了玉尔吐斯组和西山布拉克组源岩的分布特征。研究认为塔里木盆地在南华纪—震旦纪期间存在多个先后发育的、大小不等的、彼此孤立的裂陷中心,一般都经历了快速的填平补齐,晚震旦世沉积的白云岩段在全区基本可以对比,震旦纪末期的柯坪运动导致盆内大部分地区抬升,造成区域上构造地貌的差异。寒武系沉积前盆地内存在EW向古隆起带,环绕古隆起带的盆地内大部分地区可能为地势平坦的滨浅海碳酸盐台地,古地貌特征表现为从中央隆起带向南北两侧平缓降低,下寒武统优质烃源岩的发育与寒武纪早期快速海侵过程中的热水活动—上升洋流—缺氧事件有关,古构造格局暗示其在北部坳陷一带应该具有稳定广泛的分布。
 

本文引用格式

杨鑫,徐旭辉,陈强路,钱一雄,陈跃,储呈林 . 塔里木盆地前寒武纪古构造格局及其对下寒武统烃源岩发育的控制作用[J]. 天然气地球科学, 2014 , 25(8) : 1164 -1171 . DOI: 10.11764/j.issn.1672-1926.2014.08.1164

Abstract

Excellent source rocks formed during the rapid transgression at early stage of Cambrian,so they should be controlled by palaeotectonics pattern before the Cambrian deposited significantly.Combined with drilling and outcrop data,we analyzed the early evolution of Tarim Basin from Nanhuaan to Sinian and the palaeotectonics pattern before the Cambrian deposition.Furthermore,the distribution characteristic of source rocks of Yuertusi Formation and Xishanbulake Formation was discussed.The study revealed that several subsidence centers with different sizes and isolated from each other formed one after another in Nanhuaan and Sinian,and most of the subsidence were filled rapidly.The dolomite deposited in Late Sinian could be contrast basically in the region.Most parts of the basin uplifted under the control of the Keping movement in Late Sinian,which causing regional differences in the tectonic geomorphology.An ancient uplift existed in the center of Tarim Basin from west to east before the Cambrian deposition,and it was surrounded by shore shallow carbonate platform.The palaeogeomorphology was characterized by high in the middle and gradually lower to north and to south.The formation of excellent source rocks in Lower Cambrian is closely related to hydrothermal activity-upwelling oceanic current-anoxic events.The palaeotectonics pattern implied that source rocks in Lower Cambrian should distributed stable and widely in northern depression of Tarim Basin.

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