|Table of Contents|

Oil geochemical characteristics near the top overpressured surface in central Junggar Basin(PDF)

《深圳大学学报理工版》[ISSN:1000-2618/CN:44-1401/N]

Issue:
2017年No.4(331-440)
Page:
331-343
Research Field:
环境与能源
Publishing date:

Info

Title:
Oil geochemical characteristics near the top overpressured surface in central Junggar Basin
Author(s):
Yang Zhi1 He Sheng2 Zhang Yonggang3 and Xiao Qilin4
1) PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, P.R.China
2) Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, Hubei Province, P.R.China
3) PetroChina Hangzhou Institute of Geology, Hangzhou 310023, Zhejiang Province, P.R.China
4) College of Earth Science, Yangtze University, Wuhan 430100, Hubei Province, P.R.China
Keywords:
geochemical characteristics oil distribution oil accumulation top overpressured surface central Junggar Basin Jurassic
PACS:
TE 122.1
DOI:
10.3724/SP.J.1249.2017.04331
Abstract:
Oil discoveries in central Junggar Basin are mostly concentrated within a limited area around the top overpressured surface. This paper focuses on geochemical characteristics and distribution of crude oil near the top overpressured surface. The outcomes mainly include: ① the Middle and Lower Permian lacustrine dark mudstones and the Jurassic coal measures are the major source rocks, with obvious different geochemical indicators; ② oil distribution characteristics and tectonic units of both above formation sources are different. In Pen 1 Jingxi Sag, crude oil comes from Middle and Lower Permian source rocks in the upper top overpressured surface, and the crude oil comes from Middle Permian source rocks in the overpressured compartment. In western Changji Sag, the majority crude oil comes from Middle Permian source rocks, but still contains some source-mixed oil. In Dongdaohaizibai Sag and Eastern Changji Sag, coal-derived oil accounts for the majority of oil in the overpressured compartment, the oil on this sites experienced two phases of capturing hydrocarbon, and two main hydrocarbons charging in the late phase. In general, this paper delivers a systematic analysis and summary of the geochemical characteristics and distribution rule around the top overpressured surface in central Junggar Basin.

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Last Update: 2017-06-26