Geochemical Characteristics of Rare Earth Element of Dolostones from Ma5 Member of Majiagou Formation in Jingbian Gasfield,Ordos Basin:Implications for the Origin of Diagenetic Fluids

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  • 1.Changqing Oil field Company,PetroChina,Xi′an 710021,China;
    2.State Key Laboratory of Continental Dynamics (Northwest University),Xi′an 710069,China;
    3.Department of Geology,Northwest University,Xi′an 710069,China

Received date: 2014-04-11

  Revised date: 2014-11-26

  Online published: 2015-04-10

Abstract

The analyses on fluid characteristics in dolostone and reservoir formation process are very helpful to investigate the formation mechanism of dolostone and reservoir.Selecting dolostones from Ma5 member in Jingbian Gas field as research subjects,their REE geochemical characteristics are analyzed,and the diagenetic fluids information contained are discussed.After standardization by seawater,all dolostone samples have similar REE distribution characteristics which show seawater source: positive Ce anomaly (δCe =12.2-14.7),slightly LREE enrichment,flat HREE distribution patterns.After standardization by micrite,all samples show positive Eu anomaly,slightly LREE enrichment,meaning that more HREE and less Eu are lost in dolomitization process.Thus,it is perhaps relevant with hydrothermal water-rock interaction.Compared with no-dissolution dolostones,dissoluted dolostones lost 30% ∑REE,but REE distribution pattern remain steady.Besides,the closer the ancient surface,the greater the∑REE and δCe.These REE characteristics are similar to the variation of REE occurring in water-rock interaction participation by diagenetic-hydrocarbon fluids,but different from the atmospheric water leaching effect.Therefore,the present dissolution holes in dolostones are perhaps primarily related with diagenetic-hydrocarbon fluid during the second burial diagenesis.

Cite this article

WANG Dong-xu,WANG Ai-guo,ZHANG Bao-guo,WANG Zhen-liang,FEI Shi-xiang,WEI Li . Geochemical Characteristics of Rare Earth Element of Dolostones from Ma5 Member of Majiagou Formation in Jingbian Gasfield,Ordos Basin:Implications for the Origin of Diagenetic Fluids[J]. Natural Gas Geoscience, 2015 , 26(4) : 641 -649 . DOI: 10.11764/j.issn.1672-1926.2015.04.0641

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