Characteristics and Application of Compound Specific Isotope in Oil-source Identification for Oils in Dongying Depression, Bohai Bay Basin

Abstract

Abstract:

Compound specific isotope analysis was performed to help to investigate the origin and source rocks for some oils with source rock still confusing. The Es₃genetic affinity oil from lacustrine with freshwater is characterized by bimodal distribution with the mainpeak to be around nC₁₅ and nC₃₂, respectively and the forepeak particularly enriched in ¹³C. This kind of oil generally has a little heavier δ¹³C values relative to the other oils. The brackish Es₄genetic affinity oil also shows a bimodal distribution, displaying a symmetrical “double peak” shape with the boundary consistently to be around nC23. It was observed that the Es₃ and Es₄ source rocks are plotted cluster with the Es₃ and Es₄genetic affinity oils (based on biomarkers in previous studies) respectively, suggesting their good genetic relationship. The oils from subtle pools of Es₃^Min the Niuzhuang Sag have an intermediate δ¹³C values between the Es₃ and Es₄genetic affinity oils and much more approaching the latter, suggesting oil mixing of the two types oil, which is consistent with the previous opinion about mixed-source oils of the Es₃^Mfrom the Es₃and Es₄intervals for the Niuzhuang oils based on biomarkers. It was observed that highwaxy oils from Kongdian Formation (Ek) in the Dingjiawozhi tectonic belt of the Niuzhuang South Slope have flat isotope distributions, which are plotted with the Ek source rock in the Niuzhuang Sag and Ek genetic affinity oils in the Huanghua Subbasin. It suggests a close genetic relationship between the Ek oil and the Ek source rock in the Dongying Depression. We conclude that maturity only has a minor effect on the isotope for the oil and source rocks in the Dongying Depression, and it is the organic input as well as paleoenvironment of the source rock which have an absolute controlling on the isotope after detailed oiloil and oil-source correlation. Therefore, compound specific isotope approach is an excellent tool for the oil-source rock correlation in the area studied, which can be a complementation for the previous studies based on biomarkers.

Key words: Dongying Depression, compound specific isotope, mixed-source oil, oil-source rock correlation；Kongdian Formation, Shahejie Formation

CLC Number:

TE122.1

LI Su-Mei, GUO Dong. Characteristics and Application of Compound Specific Isotope in Oil-source Identification for Oils in Dongying Depression, Bohai Bay Basin[J]. Geoscience, 2010, 24(2): 252-258.

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