Geochemical Characteristics of Crude Oil and Oil-Source Correlation in Yanchang Formation in Xingzichuan Oilfield, Ordos Basin
详细信息
- 责任者：Bai Yubin (School of Earth Sciences and Engineering ; Xi’an Petroleum University ; Xi’an 710065 ; China) ; Gao Zhendong
- 刊名：Petroleum Geology & Experiment
- 出版年：2013
- 卷期：35(5)
- 关键词：原油 ; crude oil ; 油—源对比 ; oil-source rock correlation ; 鄂尔多斯盆地 ; Ordos Basin
- 页码：p.552-558
- 图表：7 illus., 3 tables, 17 refs.
- 分类号：1003
- issnNo：ISSN1001-6112
- isbnNo：CN32-1151/TE
摘要
There are significant differences between the crude oil in different horizons of Yanchang Formation,as is shown by the property,group composition,gas chromatography of saturated hydrocarbon,biomarker of terpane and sterane,comprehensive geological analyses. The crude oil properties of Chang- 4 + 5 and Chang- 6 are generally consistent and isogenous,whose difference may be related to migration fractionation effect and crude oil maturity. However,there exist obvious variances in the crude oil property between Chang- 9 or Chang- 10 and Chang- 4 + 5 or Chang- 6,indicating different maternal properties. The crude oils in Chang- 9 and Chang- 10have relatively higher maturity,mirrored by the biomarkers of Ts / Tm,C29ββ /( ββ + αα) and αααC2920S /( 20S+ 20R),etc. The content of regular sterane in the crude oils in Chang- 9 and Chang- 10 shows different genesis. Thus,the comprehensive geological analyses and oil- source correlation manifest that the crude oils in Chang- 4 + 5 and Chang 6 come from the source rocks of Chang- 7,while the crude oils in Chang- 9 generate from the Lijiapan shale,and the crude oils in Chang- 10 may stem from the effective source rocks of Chang- 92.