Accumulation mechanism and enrichment rules of the continuous hydrocarbon plays in the Lower Triassic Baikouquan Formation of the Mahu Sag,Junggar Basin

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  • (1.Research Institute of Exploration and Development,PetroChina Xinjiang Oilfield Company,Karamay 834000,China;
    2.School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023,China)

Received date: 2015-05-13

  Revised date: 2015-07-18

  Online published: 2016-02-10

Abstract

Hydrocarbon exploration in the Mahu Sag of the northwestern Junggar Basin has recently gained a significant discoverycontinuous oil plays in the Lower Triassic Baikouquan Formation glutenite reservoir with a proven oil reserve of hundreds of millions tons,which is characterized by an extensive hydrocarbon accumulation far from source sequences.This displays significance of fundamental and practical studies.Here,to improve the theory and practice of the accumulation of this discovery,we address the accumulation mechanisms and enrichment rules of the hydrocarbon accumulations.Results show that there are three favorable conditions for the hydrocarbon accumulation in general:Large hydrocarbon resource base,good reservoir and overlying and underlying preservation conditions,and well matched hydrocarbon charge and evolution.The hydrocarbon accumulation has three special characteristics.High quality lacustrine source rocks provide a good resource base.Largescale transverse faults communicating with source and reservoir sequences make the longdistance migration possible.Fandelta sedimentary system provides good conditions for reservoir and continuous hydrocarbon occurrence.The enrichment of hydrocarbon accumulation is controlled by three elements:prodelta sedimentary facies,structural high points and faults.Abnormal reservoir overpressure and fractures have important impacts on hydrocarbon production.The combination of these controls decides the future favorable exploration targets.

Cite this article

Ablimit·Imin,Tang Yong,Cao Jian,Chen Gangqiang,Chen Jing,Tao Keyu . Accumulation mechanism and enrichment rules of the continuous hydrocarbon plays in the Lower Triassic Baikouquan Formation of the Mahu Sag,Junggar Basin[J]. Natural Gas Geoscience, 2016 , 27(2) : 241 -250 . DOI: 10.11764/j.issn.16721926.2016.02.0241

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