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Comparisons of Geochemical Characteristics of Crude Oils from Lenghu Structure Zone and Mabei Oilfield in the Northern Qaidam Basin(PDF)

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

Issue:
2017年第05期
Page:
683-694
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Comparisons of Geochemical Characteristics of Crude Oils from Lenghu Structure Zone and Mabei Oilfield in the Northern Qaidam Basin
Author(s):
WANG Zhi-feng BAO Jian-ping
1. Key Laboratory of Exploration Technologies for Oil and Gas Resources of Ministry of Education, Yangtze University, Wuhan 430100, Hubei, China; 2. College of Resources and Environment, Yangtze University, Wuhan 430100, Hubei, China
Keywords:
biomarker Pr/Ph terpane sterane gammacerane crude oil correlation Jurassic Qaidam Basin
PACS:
P618.13;TE122
DOI:
-
Abstract:
The distributions and compositions of biomarkers of 26 samples of crude oils from Lenghu structure zone and Mabei oilfield in the northern Qaidam Basin were analyzed.
The results show that the crude oil from Mabei oilfield is characterized by relatively lower Pr/Ph (<2.0) and higher gammacerane index (0.10~0.20), and rich in C27 steranes relative to C29 steranes together with elevated diasteranes, suggesting that the oil should be derived from Middle Jurassic lacustrine mudstones in adjacent hydrocarbongenerating sag; however, for the crude oil from Lenghu structure zone, the Pr/Ph (2.0~2.5) is relatively higher, and gammacerane index (<0.05) is lower, and C29 steranes surpass C27 homologues. These characteristics might reveal that they are generated by lower Jurassic lacustrine mudstones.

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Last Update: 2017-10-19