收稿日期: 2003-12-29
修回日期: 2004-03-01
网络出版日期: 2004-04-20
基金资助
中国石油天然气集团公司中青年创新基金(编号:J98-05)资助
STUDY ON QUANTITATIVE IDENTIFICATION MODEL OF MIXED OILS FROM SUQIAO -WENAN AREA IN JIZHONG DEPRESSION PART I: GENETIC TYPES AND GEOCHEMICAL CHARACTERISTICS OF CRUDE OILS
Received date: 2003-12-29
Revised date: 2004-03-01
Online published: 2004-04-20
通过对原油的族组成、碳同位素、饱和烃和芳烃地球化学特征的剖析,查明苏桥-文安地区原油中不仅存在煤成油,而且存在由煤成油与下第三系原油混合而成的混源油。煤成油表现出饱和烃含量极其丰富、Pr/Ph值高(大于2)、三环萜烷以低碳数(C19~C21)化合物占优势并有递减变化趋势、C24四环萜烷丰富和伽马蜡烷含量低等地球化学特征。下第三系原油与煤成油的地球化学特征恰恰相反,Pr/Ph值低(小于1)、低碳数三环萜烷含量低并有递增变化趋势、C24四环萜烷的含量不高和伽马蜡烷含量相对丰富。混源油的地球化学特征介于煤成油与下第三系原油之间,但参数值受控于端元油混入的绝对含量。在以上地球化学特征基础上提出了冀中坳陷煤成油、下第三系油和混源油的识别指标。
张敏,王东良,朱翠山,赵红静 . 冀中坳陷苏桥-文安油气田混源油定量识别模式研究(一):原油成因分类及地球化学特征[J]. 天然气地球科学, 2004 , 15(2) : 115 -119 . DOI: 10.11764/j.issn.1672-1926.2004.02.115
Geochemical characteristics of crude oils of Suqiao-Wenan and Chaheji area in Jizhong depression have been analyzed and studied systemati cally by various of geochemical techniques and methods for molecular information , the results suggest these crude oils can be fall into three groups of coal-fo rmed oil, Paleocene Tertiary oil and mixed oil. The characteristics of coal-for med oil in Suqiao-Wenan are that saturated hydrocarbons amounts to about 80% of the bulk composition and Pristane/Phytane ratios more than 2.0, the contents of tricyclic terpanes with low carbon number(C19-C21) and C24 tetracyclic terpane are abundant, but gammacerane indices is low. In contrast, ch aracteristics of Paleocene Tertiary oils in Chaheji area in Jizhong depression a re that pristane/phytane ratio is low, contents of tricyclic terpanes with highe r carbon numbers(C23-C24) are abundant, but the gammacerane amount is abundant. However, geochemical characteristics of mixed oils from Suqiao-Wen an area in Jizhong depression are between coal-formed oils in Suqiao-Wenan are a and Paleocene Tertiary oils in Chaheji area.
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