|Table of Contents|

Abnormal Distribution and Its Origin of Steroids in the Block Ⅲ of Central Junggar Basin(PDF)

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

Issue:
2008年第04期
Page:
373-379
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Abnormal Distribution and Its Origin of Steroids in the Block Ⅲ of Central Junggar Basin
Author(s):
QIN Li-ming1; ZHANG Zhi-huan1; YANG Yo ng-cai1; LI Wei2; LIU Hong-jun1; MEI Ling1
1.Key Laboratory For Hydrocarbon Accumulation, Ministry o f Education, China University o f Petroleum, Beijing 102249, China; 2.International Petroleum Exploration Company, China Petroleum and Chemical Copporation, Beijing 100083, China)
Keywords:
crude oil;  steroid;  distribution;  origin;  Junggar basin
PACS:
P618.130.1
DOI:
-
Abstract:
The geochemical characteristics of saturated hydrocarbons from three types of crude oils or core extracts in the blockⅢ in central Junggar basin were investigated by gas chromatography-mass spectrometry and the distribution and origin of steroids were studied.Itis found that the distribution of steroids of the three types of crude oils or core extracts are similar to each other. The relative abundance of regular steranes of C27is lower than that of C28and C29. It is also showed that the relative abundance of C27, C28and C29ofαββ-type isomers is higher than that ofααα-type(C28ofαββ- type(20S)or C29ofαββ-type(20R)is the highest). However, the sources of three types of oils are inconsistent. The influential factors are thermal maturity, biodegradation, migrated fractionation and palaeoenvironment or lithology. The first and third types of oils are mainly affected by thermal maturity and migrated fractionation except biodegradation, and the first type of oil is possiblely influenced by palaeoenvironment or lithology. The second type of oils is mainly impacted by biodegradation beside thermal maturity and migrated fractionation.

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Last Update: 2008-12-20