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Comparison of Geochemical Characteristics of Two Kinds of Crude Oils in Huizhou Sag of Pearl River Mouth Basin(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2016年第02期
Page:
235-244
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Comparison of Geochemical Characteristics of Two Kinds of Crude Oils in Huizhou Sag of Pearl River Mouth Basin
Author(s):
WANG Fang BAO Jian-ping ZHU Cui-shan
1. Key Laboratory of Oil and Gas Resource and Exploration Technology of Ministry of Education, Yangtze University, Wuhan 430100, Hubei, China; 2. School of Earth Environment and Water Resources, Yangtze University, Wuhan 430100, Hubei, China
Keywords:
organic geochemistry crude oil biomarker chain alkane terpane sterane Huizhou sag Pearl River Mouth Basin
PACS:
P618.130.2;TE122.1
DOI:
-
Abstract:
Based on the distributions and compositions of various biomarkers from different crude oils in Huizhou sag of Pearl River Mouth Basin, they can be classified into coalderived and lacustrine oil. The coalderived oils from well HZ9-2-1 have the characteristics of higher Pr/Ph value (more than 4.5), abnormally abundant C24tetracyclic terpane, steplike decreasing pattern for C19-C26  tricyclic terpanes, more abundant C29 norhopane and C31 homohopane, lower neohopanes in C27-C35 hopanes, and absolutely predominant C29 rearranged and regular steranes in C27-C29 steranes. These features are the main indicators to discriminate coalderived oils from other oils. However, for lacustrine oils, their Pr/Ph values are relatively low (less than 3.0), the abundances of C24 tetracyclic terpane and C26 tricyclic terpane are similar, the distribution of C19-C26 tricyclic terpanes is normal with the main peak of C21, neohopanes and rearranged hopanes are moderate, gammacerane index indicating paleosalinity is very low. It is noted that 2-methylhopanes and 4-methylsteranes indicating cyanobacteria and dinoflagellate input are very abundant respectively, and the variation of their relative abundances has a normal correlation, representing a specific ecosystem condition to be suitable for the growth of two kinds of microbes. They have an important role in oilsource correlation.

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Last Update: 2016-03-28