天然气地球科学

• 天然气地质学 • 上一篇    下一篇

塔里木盆地寒武纪/前寒武纪构造—沉积转换及其勘探意义

陈永权,严威,韩长伟,闫磊,冉启贵,亢茜,何皓,马源   

  1. 1.中国石油塔里木油田分公司,新疆 库尔勒 841000;
    2.中国石油东方地球物理公司,新疆 库尔勒 841000;3.中国石油勘探开发研究院,北京100083
  • 收稿日期:2018-07-26 修回日期:2018-10-25 出版日期:2019-01-10
  • 作者简介:陈永权(1978-),男,吉林松原人,高级工程师,博士,主要从事塔里木盆地下古生界白云岩岩石地球化学、沉积储层研究及油气勘探生产实践研究.E-mail:chenyongquan-tlm@petrochina.com.cn.
  • 基金资助:
    国家科技重大专项课题(编号:2016ZX05004-004;2017ZX05008-005)联合资助.

Structural and sedimentary basin transformation at the Cambrian/Neoproterozoic interval in Tarim Basin:Implication to subsalt dolostone exploration

Chen Yong-quan,Yan Wei,Han Chang-wei,Yan Lei,Ran Qi-gui,Kang Qian,He Hao,Ma Yuan   

  1. 1.Tarim Oilfield Company,PetroChina,Korla 841000,China; 2.Korla Branch,Research Institute BGP CNPC,Korla 841000,China; 3.PetroChina Research Institute of Petroleum Exploration and Development,Beijing 100083,China
  • Received:2018-07-26 Revised:2018-10-25 Online:2019-01-10

摘要: 寒武系盐下白云岩是塔里木盆地油气勘探的重要领域之一,下寒武统源储分布认识不清楚已成为制约该领域区带优选的重要因素。通过对寒武系/前寒武系不整合特征、南华系—震旦系与中下寒武统沉积盆地地震解释与成图研究,探讨寒武纪/前寒武纪柯坪运动前后沉积盆地转换,旨在解决生烃坳陷与下寒武统肖尔布拉克组白云岩分布问题,指导有利勘探区带的优选。研究结果认为,柯坪运动对塔里木盆地南部影响强于北部,由于盆地南部大面积隆升,形成了塔西台地区早中寒武世南高北低的古构造格局,下寒武统由北向南超覆尖灭;塔里木盆地北部表现为继承性沉降特点,中下寒武统地层序列完整。柯坪运动导致了塔里木盆地沉积体系由南华系—震旦系北东走向裂坳沉积体系转换为东西分异、南北分异的台盆沉积体系。提出满西地区是南华纪、震旦纪、早中寒武世继承性凹陷,可能发育多套烃源岩,是台盆区内生烃能力最强的地区;肖尔布拉克组白云岩储层主要沿环满西凹陷分布;建议将塔中地区、古城地区与轮南地区作为优先勘探区带。

关键词: 塔里木盆地, 柯坪运动, 沉积盆地转换, 盐下白云岩, 勘探方向

Abstract: As one of the important fields of oil and gas exploration in Tarim Basin,sub-salt dolomite in Cambrian has been restricted by the poor acknowledge of source rocks and reservoirs distribution.Based on the study of the unconformity characteristics of the Cambrian/Neoproterozoic,the seismic interpretation and mapping of the Cryogenian-Sinian and Middle-Lower Cambrian,this paper discussed the sedimentary basin transformation before and after Kalpin movement at the Cambrian/Neoproterozoic interval,in order to solve the problem of hydrocarbon-bearing depression and the dolomite reservoir distribution of the Xiaoerbulake Formation,guiding the optimal exploration zone.Results show that the Kalpin movement has more influence on the southern part of Tarim Basin than the northern part.In the southern part of the western platform,the Lower Cambrian onlaps towards southern paleo-continent.In the northern part of the basin,there is mainly parallel unconformity contact,and the stratigraphic sequence of the Lower-Middle Cambrian is complete.Kalpin movement caused a major paleo-structure transformation from the North-East in Neoproterozoic to the east-west and north/south in Cambrian,and sedimentary transformation from rifted-sedimentary to platform-basin sedimentary.According to the palaeogeography of the Cryogenian-Sinian and Early-Middle Cambrian,the most abundant Neoproterozoic-Cambrian source rocks in the Tarim Basin distribute in the Manxi Depression.The dolomite reservoirs of Xiaoerbulake Formation mainly distributes around the Manxi Depression.It is suggested at last that Central Tarim Uplift,Gucheng area and Lunnan areas should be preferentially prospected.

Key words: Tarim Basin, Kalpin movement, Sedimentary basin transformation, Subsalt dolostone, Exploration zones

中图分类号: 

  • TE121
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