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天然气地球科学

• 天然气地质学 • 上一篇    下一篇

塔里木盆地库车坳陷东秋里塔格构造样式及勘探前景

李德江1,2，易士威1,2，冉启贵1,2，缪卫东1,2，宋海敬1,2，白晶玉1,2   

  1. 1.中国石油勘探开发研究院廊坊分院，河北 廊坊 065007；
    2.中国石油天然气集团公司天然气成藏与开发重点实验室，河北 廊坊 065007
  • 收稿日期:2015-05-25 修回日期:2015-08-28 出版日期:2016-04-10 发布日期:2016-04-10
  • 作者简介:李德江(1972-)，男，辽宁凌海人，高级工程师，博士，主要从事层序地层学、沉积学和油气成藏综合研究. E-mail:lidejiang69@petrochina.com.cn.
  • 基金资助:
    国家科技重大专项项目“中国大型气田形成条件、富集规律及目标评价(二期)”(编号：2011ZX05007)资助.

Structural characters and potentiality of the east Qiulitage anticline belt in Kuqa Depression

Li De-jiang1,2，Yi Shi-wei1,2，Ran Qi-gui1,2，Miao Wei-dong1,2，Song Hai-jing1,2，Bai Jing-yu1,2   

  1. 1.Langfang Branch of PetroChina Research Institute of Petroleum Exploration and Development,Langfang 065007,China；
    2.The Key Laboratory of Gas Reservoir Formation and Development,CNPC,Langfang 065007,China
  • Received:2015-05-25 Revised:2015-08-28 Online:2016-04-10 Published:2016-04-10

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摘要： 库车坳陷是塔里木盆地油气勘探的三大阵地之一，近年来在大北—克深区带白垩系巴什基奇克组持续取得重大突破，已形成万亿方大气区。但位于库车坳陷中部的秋里塔格构造带一直未能获得重要进展，特别是秋里塔格东段先后3口探井均未能在白垩系获得工业油气流。前人主要认为该区构造类型是以基底卷入形成的大型背斜圈闭为主，目前实践证明这一认识制约了该区勘探发展。由此可见，取得油气地质新认识是获得突破的首要前提条件。基于地震资料重新处理的基础上，以前陆盆地系统体系为理论划分基础，开展对东秋里塔格构造样式的精细分析。通过地震精细解释、盐岩三角带分析、地表地质分析、平衡剖面分析和已钻井分析5个方面研究，表明该区与大北—克深构造样式相似，均发育塑性滑脱叠瓦冲断构造。并落实了东秋里塔格断裂下盘冲断圈闭具体形态和位置。进一步综合分析后该区油气地质条件优越：油源充足，紧临生烃中心，处于构造高部位，一直是油气运移的指向区；主要目的层巴什基奇克组发育与大北—克深相同的辫状河三角洲前缘砂体；并具有古近系和新近系2套膏盐岩区域盖层。由此得出东秋里塔格是目前库车坳陷新区中最有利、最现实的勘探区带。

关键词: 库车坳陷, 东秋里塔格构造带, 塑性滑脱叠瓦冲断构造, 有利勘探区带

Abstract: Kuqa Depression is very important among the three oil and gas exploration zones in Tarim Basin.Continual important breakthroughs have been obtained in recent years,it has become a large oil and gas zone of 1×1012m3.But Qiulitage structural belt which lies in middle Kuqa Depression has still not significant stride,especially there is no commercial oil and gas flow in Cretaceous after three wells were drilled in the east Qiulitage.The main opinion of predecessors is that there are large anticlinal trap resulted from basement decollement,but now it is proved confinement for exploration.As a result,acquiring new geological viewpoint is a principal precondition for breakthroughs.Based on reprocess of seismic data,according to the theory of classification of the foreland basin system,we undertake to precisely analyze the model of structural evolution of the east Qiulitage.Based on precise seismic interpretation,salt rock triangular area analysis,surficial geology analysis,balanced profile analysis and drilled wells analysis,the structural type of the east Qiulitage is similar with that of Dabei-Keshen,which all present a ductile decollement imbricated thrust structure.The concrete thrust faulted anticline was developed in the east Qiulitage fault footwall.The oil and gas geological conditions of this area are superior after further comprehensive research.The sources are abundant,the anticline lies closely in the oil and gas forming centre and structural crest.It is a favourable area for oil and gas accumulation.The chief intended interval,Bashenjiqike Formation,present wide sandbodies of the braided delta front,just like Dabei-Keshen’s.There are two sets of gypsum and salt rock for regional seals.So the east Qiulitage belt is the most favourable and actual area for exploration in Kuqa Depression.

Key words: Kuqa Depression, East Qiulitage anticline belt, Ductile decollement imbricated thrust structure, Favourable and actual area

中图分类号: 

  • TE121.3
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