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Geochemical characteristics and origin of a crude oil from Well Xuwen X3 in the Maichen Sag,Beibuwan Basin,China

Bao Jian-ping1,He Dan1,Zhu Cui-shan1,Liu Yu-rui2,Wang Wen-jun2,Liu Hong-yu2   

  1. 1.Key Laboratory of Oil & Gas Resource and Exploration Technology,Geochemistry Department,Yangtze University,Wuhan 430100,China;
    2.Geoscience Institute of Jiangsu Oilfield Company,SINOPEC,Yangzhou 225009,China
  • Received:2016-12-18 Revised:2017-03-21 Online:2017-05-10 Published:2017-05-10

Abstract:

Abundant and whole nC11-39 normal alkane series and iC13-20 phytane series and 25-norhopanes coexist in a crude oil from Well Xuwen X3 in the Maichen Sag of Beibuwan Basin,it suggests that this oil is a mixture of unbiodegraded oil with severely biodegraded oil.Chain alkanes and C14-16 bicyclic sesquiterpanes having low resistance to biodegradation can provide some useful information on the source and origin of the unbiodegraded oil which charged into the mixed oil at late stage.High Pr/Ph ratio (>5.8) and abundant terrigenous sesquiterpanes,similar to those coal-derived oils from the Baiyun Sag of Pearl River Mouth Basin and Qiongdongnan Basin,suggest that unbiodegraded oil should be derived from coal-containing sequences of Oligocene Weizhou Formation in Beibuwan Basin.In general,the concentrations of triterpanes and steranes in coal-derived oil are 1-2 orders of magnitude lower than those of lacustrine oils,so some specific biomarkers such as oleanane and bicadinanes will be concealed by biodegraded oil having relatively abundant hopanes and steranes.It is noteworthy that the distributions and compositions of tricyclic terpanes,hopanes,gammacreane,steranes and β-carotane in the mixed oil from Well Xuwen X3 are very different from those of lacustrine oils in the Beibuwan Basin and coal-derived oils from the Baiyun Sag of Pearl River Mouth Basin and Qiongdongnan Basin.It suggests that biodegraded oil could not be derived from Tertiary source rocks in the Beibuwan Basin.Based on the geological background of the Beibuwan Basin,marine carbonate and clastic rocks are observed in Later Paleozoic sequences,it can provide some geological and geochemical clue to determine the source and origin of severely biodegraded oil.Therefore,more attention should be paid to this new area of Upper Paleozoic sequences for oil and gas exploration in the Beibuwan Basin.

Key words: Biomarkers, Crude oils, Biodegradation, Upper Paleozoic sequences, Maichen Sag, Beibuwan Basin

CLC Number: 

  • TE122.1+13

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