收稿日期: 2013-10-18
修回日期: 2013-12-01
网络出版日期: 2014-07-10
基金资助
国家自然科学基金项目(编号:41272139);山东省自然科学杰出青年基金项目(编号:JQ201311);教育部科学技术重点项目(编号:212100);山东科技大学科技计划项目(编号:2010KYTD103;2012KYJQ101)联合资助.
Geochemical Characteristics of Light Hydrocarbons from the Central Part of Tabei Uplift and Their Implications
Received date: 2013-10-18
Revised date: 2013-12-01
Online published: 2014-07-10
常象春,王铁冠,程 斌,王 鑫,邓冰红 . 塔北隆起中部原油轻烃地球化学特征及其意义[J]. 天然气地球科学, 2014 , 25(7) : 1058 -1064 . DOI: 10.11764/j.issn.1672-1926.2014.07.1058
Geochemical characteristics of light hydrocarbons for 27 crude oils from Tabei Uplift were investigated.The results show that the source input was highly similar for their roughly equal compositions of C5-C7 and C7 light hydrocarbons,despite they were sampled from different horizons of different oilfields with variable occurrence.It is suggested that those oils were of marine origin and mainly sourced from algae and bacteria.The 2-MH/3-MH ratio correlates well with the Pr/Ph ratio,implying the subtly different media conditions of sedimentary environment.Heptane and isoheptane values are 22.97%-37.37% and 1.04-4.06 respectively,indicating a high maturity of oils,associated with the high hydrocarbon-generating temperature (119.03-130.89℃).Due to the severe biodegradation of early charged oil,light hydrocarbons from mixed oils with multi-stage charging only delineate the geochemical implications of late charged fresh oil.
Key words: Crude oil; Light hydrocarbon parameter; Maturity; Biodegradation; Tabei Uplift
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