Controls of the permian unconformity on reservoir formation in Zhongguai-District 5 area of Junggar Basin

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  • 1.Research Institute of Exploration and Development ,Xinjiang Oilfield Company,PetroChina,Karamay  834000,China;
    2.Department of Reservoir Evaluation,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;3.Inefficient Oilfield Development Company,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China

Received date: 2017-06-09

  Revised date: 2017-08-15

  Online published: 2019-09-19

Abstract

Many oil and gas reservoirs have been found above or below the Permian unconformity in Zhongguai-District 5 area of Junggar Basin,indicating that the unconformity controls reservoir formation.The unconformity is considered truncation-overlap type based on the analysis of the contact relation between the upper and lower of unconformity,and belongs to two-layer structure;in general the unconformity reservoirs mainly developed 8 types.Based on the unconformity structure,reservoir-cap rock assemblage and structural feature,above the unconformity,the upper Wuerhe’s sandy conglomerate and sandstone distributed widely,not only the main channel of oil and gas meshwork-carpet migration,but also the important enriched oil site,gathered two stages of oil and gas from Fengcheng Formation,and formed many reservoirs;the stratum below unconformity has weakly transport capacity,and because the natural gas on the channel requirements are relatively low,therefore,under the unconformity of the Jiamuhe is the main formation of gas reservoirs.Most gas reservoirs are close to the unconformity,only a few are inside gas reservoirs.

Cite this article

Han Bao, Wang Chang-wei, Sheng Shi-feng, Pang Yan-qing . Controls of the permian unconformity on reservoir formation in Zhongguai-District 5 area of Junggar Basin[J]. Natural Gas Geoscience, 2017 , 28(12) : 1821 -1828 . DOI: 10.11764/j.issn.1672-1926.2017.10.001

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