Molecular Geochemical Characteristics of PotentialSource Rocks of the Wuli Premofrost in the Tibet Plateau,China

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  • 1.School of Energy and Water Resource,Yangtze University,Wuhan 430100,China;
    2.Key Laboratory of Exploration Technologies for Oil and Gas Resources (Yangtze University),Ministry of Education,Wuhan 430100,China;
    3.Qingdao Institute of Marine Geology,Qingdao 266071,China

Received date: 2013-07-25

  Revised date: 2013-10-18

  Online published: 2014-06-10

Abstract

In order to ascertain whether there exists natural gas hydrate in Wuli premofrost of Tibet Plateau and to investigate the gas source of gas hydrate,based on the analysis of organic carbon content,rock pyrolysis and vitrinite reflectance measurement on the potential source rocks and combined with molecular biomarker analysis technology,a preliminary study on organic sources,depositional environment and the thermal evolution degree was made on the Permian and Triassic mudstones,carbonaceous mudstones and coals from Wuli area.The results illustrated that the potential source rocks of this area were developed in reducing environment of marine-terrigenous facies,and most organic material was a mixture of lower aquatic organism and higher terrigenous plants.However,biogensis of some samples was mainly originated from lower hydrobiont.The isomerization parameter values of C29steranes and C32 homohopanes reached equilibrium point except individual sample.The organic carbon content in some mudstone intervals of Nayixiong Formation was relatively high and the coal-bearing sequence was relatively thick in the Upper Permian.and generally at over-mature stage.Therefore,they could be as gas source rocks.However,because of limited distribution in the west of eighty-five track section,the coal-bearing strata of the Upper Triassic Bagong Formation might merely be local gas source.

Cite this article

CHEN Xiao-hui,ZHANG Min,GONG Jian-ming . Molecular Geochemical Characteristics of PotentialSource Rocks of the Wuli Premofrost in the Tibet Plateau,China[J]. Natural Gas Geoscience, 2014 , 25(6) : 882 -888 . DOI: 10.11764/j.issn.1672-1926.2014.06.882

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