Geochemical Characteristics of Natural Gas and Reservoir Continuity of the Second Member of Xujiahe Formation in the Pingluoba Structure,Sichuan Basin

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  • 1.Southwest Petroleum University,Chengdu 610500,China;
    2.Gas Production Engineering Research Institute of Southwest Oil and Gas Field Company,Guanghan 618300,China

Received date: 2013-03-22

  Revised date: 2013-09-28

  Online published: 2014-03-10

Abstract

Based on the comprehensive analysis of gas composition,compound specific carbon isotopic composition and natural gas enrichment light hydrocarbon fingerprint,natural gases of the Second Member of Xujiahe Formation (T3x2) reservoirs in Pingluoba Structure have the same or similar geochemical characteristics.The high methane content,high dryness coefficient and heavy carbon isotope indicated that the natural gas was a product of high mature stage.They were originated from the Xujiahe Formation of the Upper Triassic.However,due to different accumulation time,some subtle geochemical differences existed in the hydrocarbon fingerprint characteristics.The results showed that the continuity between wells is good for the main structure at the high parts.The continuity between wells is also good for the southeast wing of the structure,but relatively poor in the north-west wing of the structure.However,compared to that for the main structure at the high parts,the continuity between wells is relatively poor both in the southeast and north wings of the structure,especially the Pingluo 15 well in the northwest wing of the structure which has the worst continuity with others.
 

Cite this article

WANG Shun-yu,MING Shuang,LIANG Cong,ZHANG Ting-shuai . Geochemical Characteristics of Natural Gas and Reservoir Continuity of the Second Member of Xujiahe Formation in the Pingluoba Structure,Sichuan Basin[J]. Natural Gas Geoscience, 2014 , 25(3) : 388 -393 . DOI: 10.11764/j.issn.1672-1926.2014.03.388

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