天然气地球科学

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塔里木盆地巴什托构造异常高压特征及成因

余琪祥1,余风华2,史政1   

  1. 1.中国石化石油勘探开发研究院无锡石油地质研究所,江苏 无锡 214151;2.泰州学院,江苏 泰州 225300
  • 收稿日期:2017-02-22 修回日期:2017-06-12 出版日期:2017-07-10 发布日期:2017-07-10
  • 作者简介:余琪祥(1967-),男,湖南平江人,高级工程师,主要从事油气勘探和石油地质综合研究. E-mail:yqx9763@sina.com.
  • 基金资助:

    国家科技重大专项课题“中西部地区碎屑岩层系油气富集规律与勘探方向”(编号:2016ZX05002-006)资助.

Genesis analysis of abnormal overpressure in Bashituo structure,Tarim Basin

Yu Qi-xiang1,Yu Feng-hua2,Shi Zheng1   

  1. 1.Wuxi Petroleum Geology Institute,Research Institute of Petroleum Explorationand Production,SINOPEC,Wuxi 214126,China;
    2.Taizhou University,Taizhou 225300,China
  • Received:2017-02-22 Revised:2017-06-12 Online:2017-07-10 Published:2017-07-10

摘要:

异常高压油气藏是塔里木盆地台盆区重要的勘探目标,其中巴什托构造于泥盆系东河塘组、石炭系巴楚组、小海子组和下二叠统南闸组发现了异常高压油气藏。利用钻井测井与试油气资料,根据X-射线衍射黏土矿物含量、突破压力与比表面积等实验分析结果,探讨巴什托构造异常高压特征与成因。研究表明,石炭系—二叠系处于晚成岩作用阶段,黏土矿物大量脱水、天然气充注和存在欠压实带是形成巴什托构造异常高压的主要原因。高矿化度封闭型地层水、高突破压力的Ⅰ类和Ⅱ类泥岩和膏盐岩盖层是保持巴什托构造异常高压的重要条件。

关键词: 异常高压, 成因分析, 巴什托构造, 麦盖提斜坡, 塔里木盆地

Abstract:

Abnormal overpressure hydrocarbon reservoir is major target of petroleum exploration in unmodified forland region of Tarim Basin,and the abnormal overpressure hydrocarbon reservoir was discovered in Donghetang Formation,Bachu Formation,Xiaohaizi Formation and Nanzha Formation at Bashituo structure.We discussed the characteristic and genesis of thess reservoir based on the drilling and logging data,oil and gas production test data,clay mineral content,break through pressure,specific surface area,showing that the Carboniferous-Permian was at the late diagenesis stage,and the important factors of abnormal overpressure were dewatering of clay mineral,gas charging and the uncompacted belt.High salinity sealing water,the Ⅰ and Ⅱ mud rock and gypsum cap with hith breakthrough pressure were the necessary condition of the formation of Bashituo structure.

Key words: Abnormal overpressure, Genesis analysis, Bashituo structure, Maigaiti slope, Tarim Basin

中图分类号: 

  • TE121
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