Oil-Source Correlation and Relative Contribution of Source Rock from Enping Formation in Zhu Ⅰ Depression
Guo Pengfei
He Sheng
Chai Derong
Yin Shiyan
Abstract：Study of the contribution from Enping Formation to oil accumulation in Zhuyi depression has an important application value to the enlargement of exploration area and the discovery of new reserves,and the related research is less.In this paper, the correlation of oil and source rock in Zhu Ⅰ depression,Pearl River Mouth Basin is discussed first,and then the relative contribution of source rock in the Eocene to Oligocene Enping Formation (Ee )was investigated by combining end-member oil mixing experiment and biomarkers absolute concentrations.Oil-source correlation results show that the oils in Zhu Ⅰ depres-sion can be divided into three classes.The first class derived from Eocene deep-water lacustrine Wenchang Formation (Ew ) mainly distributes in Huilu low uplift,Panyu 4 sag and Liuhua uplift,etc.The second class derived from the Ee distributes on-ly in the northern of Huizhou sag.The third class (mixed oils)derived from both the Ew and the Ee distributes in the southern of Huizhou sag and Enping sag.End-member oil mixing experiment shows that the plate established by concentration and geo-chemical indexes,such as steranes and terpanes concentration,was suitable to indicate the relative contribution of two types of source rock in Zhu Ⅰ depression.Results show that mudstones in the Ew was the main source rock in Zhu Ⅰ depression,the relative contribution of the Ee is only appear in the Huizhou sag and Enping sag.
Keywords：oil-source correlationEnping Formationrelative contributionend-member oil mixing experimentZhu Ⅰ de-pressionpetroleum geologygeochemisity
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1177-1186 )