天然气地球科学 doi: 10.11764/j.issn.1672-1926.2017.05.001

• 天然气地质学 • 上一篇    下一篇

塔里木盆地古城地区上寒武统热液改造型储层形成机制与分布预测

王坤,胡素云,刘伟,王铜山,黄擎宇,石书缘,马奎   

  1. 中国石油勘探开发研究院,北京 100083
  • 收稿日期:2017-03-05 修回日期:2017-05-04 出版日期:2017-06-10 发布日期:2017-06-10
  • 作者简介:王坤(1985-),男,山东东营人,工程师,博士,主要从事碳酸盐岩沉积与储集层研究工作. E-mail:wangkuntoby@163.com.
  • 基金资助:

    国家科技重大专项(编号:2011ZX05004-001);中国石油天然气股份有限公司重大科技专项(编号:2014E-32-01)联合资助.

The formation mechanism and distribution prediction of the hydrothermal reformed reservoir of the Upper Cambrian in Gucheng area,Tarim Basin,China

Wang Kun,Hu Su-yun,Liu Wei,Wang Tong-shan,Huang Qing-yu,Shi Shu-yuan,Ma Kui   

  1. PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China
  • Received:2017-03-05 Revised:2017-05-04 Online:2017-06-10 Published:2017-06-10

摘要:

塔里木盆地古城地区寒武系存在热液活动且白云岩的岩石学、地球化学特征表明其受到了热液的影响,但热液活动与储层形成之间的关系以及储层的分布特征尚不明确。根据寒武纪岩相古地理和台缘带丘滩体岩石学特征的综合分析,认为古城地区寒武统白云岩为浅埋藏白云岩化作用成因,热液的作用方式是后期改造,发育热液改造型白云岩储层。镁同位素分析表明,鞍形白云石沉淀所需的镁离子主要来自于寒武系本身,热液流体先对白云岩进行溶蚀,层内富集镁离子后再发生白云石沉淀。综合测井、岩心资料,通过计算强热液改造段与待预测井段的测井响应之间的协方差距离,实现了城探1井热液改造强度的单井预测。与三维地震资料相结合,实现了上寒武统各期丘滩体等时地层格架的热液改造强度的平面预测。结合热液流体对储层的差异改造,预测了不同储集性能的热液改造型储层的平面分布。

关键词: 热液改造型储层, 储层形成机制, 热液改造强度, 分布预测

Abstract:

Two stages of hydrothermal occurred in the Cambrian carbonate of Gucheng area,Tarim Basin and thepetrologic and geochemical characteristics of the dolomite indicate that it was influenced by hydrothermal;however,the relationship between hydrothermal activities and the formation of dolostone reservoir and the distribution of the reservoir were not well studied yet.According to the characteristics of Cambrianlithofacies paleogeography and platform margin petrology,it suggests that the dolomitization occurred during shallow burialstage,the action mode of hydrothermal is late-stage reformation,further indicating that the type of reservoir is hydrothermal reformed reservoir.Based on the ways of hydrothermal influence on reservoir,it shows that the reservoir type can be named as hydrothermal-reformed dolostone reservoir.Magnesium isotope analysis shows that the magnesium ions needed for saddle dolomite are mainly from Cambrian itself.Hydrothermal first dissolved the Cambrian dolostone and enriched magnesium ions and then precipitated dolomite locally.Based on logging and core data,with the calculation of covariance distances between logging values,the hydrothermal reforming intensity of Well CT 1 was predicted.Combined with 3D seismic data,the distributions of hydrothermal reforming intensity in plane were obtained.Combined with the differences of different hydrothermal reformation,the distribution of hydrothermal reformed reservoir with different qualities was predicted.

Key words: Hydrothermal reformed reservoir, Formation mechanism of reservoir, Hydrothermal reforming intensity, Distribution prediction

中图分类号: 

  • TE122.3

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