北部湾盆地原油地球化学特征与成因类型

doi:10.11743/ogg20070223

Abstract

Abstract:

Quantitative analyses on hydrocarbon components of typical crude samples from different depressions of Beibuwan basin indicate that the samples from the Weixinan depression in the northern part of the basin have higher concentrations of biomarkers in tricyclic terpanes,hopanes,and steranes,and that from the Fushan depression and Maichen depression in the southern part of the basin have relatively lower concentration of the biomarkers,but higher concentration of aromatic hydrocarbons.It suggests that the depositional environment and geochemical characteristics of source rocks vary dramatically in the northern and southern parts of the basin.The distribution of hopanes,steranes and aromatic hydrocarbons can be used in the establishment of the genetic types of crude oils from different depressions of the basin.The results show that the genetic types of crude oils from the Weixinan depression and from the Fushan and Maichen depressions are different,and that the crude oils from the Wushi depression is a intermediate type with a transitional features.

Key words: biomarker concentration, aromatic hydrocarbon concentration, crude oils, genetic types, Beibuwan basin

CLC Number:

TE112.322

Bao Jianping, Liu Yurui, Zhu Cuishan, Ni Chunhua. Geochemical characteristics and genetic types of crude oils[J]. Oil & Gas Geology, 2007, 28(2): 293-298.

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Geochemical characteristics and genetic types of crude oils

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