Maturity and oil-cracking of the Ordovician oils from Tahe Oilfield,Tarim Basin,NW China
Received date: 2016-11-09
Revised date: 2016-12-26
Online published: 2017-02-10
The maturity of the Ordovician oils from Tahe Oilfield of Tarim Basin,NW China was assessed by various maturity parameters,such as biomarkers,aromatic parameters and diamondoid parameters.Both Ts/(Ts+Tm) and C29Ts/(C29H+C29Ts) values indicated that the maturity of oils has not reached the condensates stages,which is in consistent with the maturity obtained by MPI-1.However the diamondoid maturity suggested that the oil maturity is in the range of 1.1%-1.6% RO,which is obviously higher than that of the maturity obtained by biomarker and MPI-1.This discrepancy of maturity may reflect the Ordovician reservoir have multiple filling history.The concentration of methyldiamantane suggested that the methyldiamantane concentration of oils is scattered and increase slowly when Ts/(Ts+Tm) value is lower than 0.55,and the content increases rapidly when Ts/(Ts+Tm) value is higher than 0.55.Based on the diamondoid concentration of oils from different age,it is proposed that the diamondoid baseline is about 15×10-6 in the Tahe Oilfield.In general,the concentration of methyldiamantane of most Ordovician oils ranges from 4×10-6 to 35×10-6,suggesting that the degree of oil-cracking is lower than 50% and the deep Ordovician has the potential of oil exploration.The distribution of the concentration of methyldiamantane is characterized by high in east,low in west,high in south and low in north,suggesting two migration pathways are from south to north, from east to west, respectively, which is consistent to the migration results obtained from oil density and maturity parameters such as Ts/(Ts+Tm).
Key words： Diamondoid; Adamantane; Diamantane; Oil-cracking; Oil maturity; Ordovician; Tahe Oilfield
Ma An-lai，Jin Zhi-jun，Zhu Cui-shan . Maturity and oil-cracking of the Ordovician oils from Tahe Oilfield,Tarim Basin,NW China[J]. Natural Gas Geoscience, 2017 , 28(2) : 313 -323 . DOI: 10.11764/j.issn.1672-1926.2017.01.003
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