Diamondoid Hydrocarbons and Their Geochemical Significances in Condensate from the Zhujiadun Gas Reservoir in the Yancheng Sag

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  • Key Laboratory of Oil and Gas Resource and Exploration Technology,Geochemistry Department,Yangtze University,Jingzhou 434023,China

Received date: 2014-08-04

  Revised date: 2014-10-08

  Online published: 2015-03-10

Abstract

The saturation fractions were analyzed by GC-MS from the condensate (E1f1) and the source rock (K2t2) in well Yancan 1 in the Zhujiadun Gas Reservoir of the Yancheng Sag.The results show that they have similar distributions and compositions in steranes and hopanes,which suggests that this condensate is related to the K2t2 source rocks.However,the maturity of the condensate is higher than that of the source rock based on Ts/Tm and C29 sterane 20S/(20S+20R) ratios.Diamondoid hydrocarbons are a kind of thermally more stable hydrocarbons in crude oils and source rocks,and alkyl diamantanes are thermally more stable than alkyl adamantanes.In the condensate,alkyl adamantanes and diamantanes were relatively abundant.However,alkyl adamantanes were only identified,and alkyl diamantanes were not whole or even absent in the K2t2 source rock.This phenomenon indicates that the condensate has higher maturity compared with the source rock,consistent with biomarker compounds.Based on the relationship between methyl adamantane index MAI,methyl diamantane index MDI and the vitrinite reflectance RO values,the RO value of the condensate is up to about 1.3%-1.6%,indicating that it was derived from the deeper K2t2 source rocks in the Yancheng Sag and diamondoid hydrocarbons have a specific role in the determination of thermal evolution of organic matter.

Cite this article

BAO Jian-ping,LIANG Xing-yu,ZHU Cui-shan,JIANG Xing-chao . Diamondoid Hydrocarbons and Their Geochemical Significances in Condensate from the Zhujiadun Gas Reservoir in the Yancheng Sag[J]. Natural Gas Geoscience, 2015 , 26(3) : 505 -512 . DOI: 10.11764/j.issn.1672-1926.2015.03.0505

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