Geochemical study of Cambrian source rocks in the cratonic area of Tarim Basin,NW China

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  • State Key Laboratory of Petroleum Resources and Prospecting,College of Geoscience,China University of Petroleum,Beijing 102249,China

Received date: 2015-09-05

  Revised date: 2015-10-22

  Online published: 2019-09-20

Abstract

Despite that huge petroleum resources have been found reservoired in the Cambrian,Ordovician,Carboniferous and Triassic in the Central Tarim and Tabei Uplifts,source rocks of the marine petroleum in the Tarim Basin have still been disputed for decades.With the development of exploration and more discover of source rocks,it is necessary to conduct research on Cambrian source rocks comprehensively and in detail.On the basis of a series of regular geochemical analysis,including TOC(total organic carbon),GC-MS(Gas Chromatography-Mass Spectrometer) and stable carbon isotopic analysis,27 Cambrian source rocks collected from the Tarim Basin were analyzed to obtain information about hydrocarbon-generation potential and geochemical characteristics.The results show that these samples belong to good to excellent source rocks,with TOC(total organic carbon) values ranging from 0.5%-8.39%.Source rocks of the Lower Cambrian were better than those of Middle Cambrian.Molecular biomarker indicates a source facies of alleges or aquatic organisms.The strong reducing environment was evidenced by low Pr/Ph and high content of dibenzothiophenes.High content of gammacerane suggests a water-column stratification.Most samples show relative abundance of terpanes and steranes,and the ratios of C21/C23terpanes and C28/(C27+C28+C29)regular steranes were greater than 1.0% and 25%,respectively.The relative higher abundances of C26,C27 triaromatic steroids and triaromatic dinosteroids were also observed.The stable carbon isotopic values were relatively heavy(>-31‰).The geochemical parameters of mudstones from Kalpin Uplift were different from the rest Cambrian source rocks,which indicates a unique source organisms.

Cite this article

Yang Fu-lin, Wang Tie-guan, Li Mei-jun . Geochemical study of Cambrian source rocks in the cratonic area of Tarim Basin,NW China[J]. Natural Gas Geoscience, 2016 , 27(5) : 861 -872 . DOI: 10.11764/j.issn.1672-1926.2016.05.0861

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