The Discovery and Geological Significance of Petroleum of Triassic Feixianguan Formation in Northwest Sichuan Basin
Received date: 2010-02-25
Revised date: 2010-09-23
Online published: 2011-08-10
Several techniques,including GC,GC-MS and GC-IRMS,are used to study the molecular geochemistry and origin of oil (filled joint and cavern in limestone) of T1f1 in the Changjianggou profile of the northwest of the Sichuan basin.The data show that the petroleum δ13C values for bulk oil and group compositions are less than -30 ‰.The crude oil has not suffered the secondary change such as bacterial decomposition,water leaching and so on.The isotope fractionation effect for the group compositions is small.The distribution of normal paraffin alkane is single peak,with nC22 prominent peak.Pr/Ph ratio (isoprenoid) is 0.75,with the Pr and Ph prominent predominance comprised with nC17and nC18respectively.The aromatic hydrocarbons present a shape of camel shoulder suggesting complicate domponents,and the phenanthrene is the prominent peak.Based on the methyl phenanthrene index (MPI1),RO for the crude oil is about 0.83%.The carbon number for the tricyclene is distributed from C19to C30,with C23prominent peak.C30 is the prominent peak in hopanoid and γ-wax alkane is the medium intensity content.The C29steroid is predominant in the sterane series,with the “V” shape distribution of C29>C27>C28.The values of maturity parameter C2920S/(20S+20R) and C29ββ/(ββ+αα) are 0.39 and 0.31 respectively,which not reach the isomerization equilibrium.On the basis of regional geology,source rock characteristics of T1f1,geochemical characteristics of petroleum and oil\|source correlation,we consider that the crude petroleum is a product of Cambrian source rock at the oil generation peak and the occurrence of crude petroleum in the limestone cave and seam is a result of tectonic destroys after the early oil accumulation.
LIU Chun, GUO Qiang-Xin, ZHANG Hui-Liang . The Discovery and Geological Significance of Petroleum of Triassic Feixianguan Formation in Northwest Sichuan Basin[J]. Natural Gas Geoscience, 2011 , 22(4) : 692 -699 . DOI: 10.11764/j.issn.1672-1926.2011.04.692
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