BIOMARKER GEOCHEMISTRY OF PALEOGENE CRUDE OILS AND SOURCE ROCKS FROM THE RAOYANG SAG, BOHAI BAY BASIN, NE CHINA: AN OIL – SOURCE ROCK CORRELATION STUDY

AbstractThis study considers the Upper Cretaceous Qingshankou Formation, Yaojia Formation, and the first member of the Nenjiang Formation in the Western Slope of the northern Songliao Basin. Dark mudstone with high abundances of organic matter of Gulong and Qijia sags are considered to be significant source rocks in the study area. To evaluate their development characteristics, differences and effectiveness, geochemical parameters are analyzed. One-dimensional basin modeling and hydrocarbon evolution are also applied to discuss the effectiveness of source rocks. Through the biomarker characteristics, the source–source, oil–oil, and oil–source correlations are assessed and the sources of crude oils in different rock units are determined. Based on the results, Gulong and Qijia source rocks have different organic matter primarily detrived from mixed sources and plankton, respectively. Gulong source rock has higher thermal evolution degree than Qijia source rock. The biomarker parameters of the source rocks are compared with 31 crude oil samples. The studied crude oils can be divided into two groups. The oil–source correlations show that group I oils from Qing II–III, Yao I, and Yao II–III members were probably derived from Gulong source rock and that only group II oils from Nen I member were derived from Qijia source rock.

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Reconstruction of oil charging history in the multi-source petroleum system of the Beidagang buried-hill structural belt in the Qikou Sag, Bohai Bay Basin, China: Based on the integrated analysis of oil-source rock correlations, fluid inclusions and geologic data

Journal of Petroleum Science and Engineering ◽

10.1016/j.petrol.2021.109197 ◽

2021 ◽

pp. 109197

Author(s):

Chuanzhen Zhu ◽

Wenzhe Gang ◽

Xianzheng Zhao ◽

Guo Chen ◽

Lixin Pei ◽

...

Keyword(s):

Source Rock ◽

Fluid Inclusions ◽

Petroleum System ◽

Integrated Analysis ◽

Bohai Bay ◽

Bohai Bay Basin ◽

Qikou Sag ◽

Oil Source ◽

Buried Hill ◽

Geologic Data

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Oil chemometrics and geochemical correlation in the Weixinan Sag, Beibuwan Basin, South China Sea

Energy Exploration & Exploitation ◽

10.1177/0144598720950467 ◽

2020 ◽

Vol 38 (6) ◽

pp. 2695-2710

Author(s):

Yao-Ping Wang ◽

Xin Zhan ◽

Tao Luo ◽

Yuan Gao ◽

Jia Xia ◽

...

Keyword(s):

Source Rock ◽

Principal Component ◽

Sedimentary Basins ◽

Oil Field ◽

Source Rocks ◽

Petroleum Exploration ◽

Crude Oils ◽

Geochemical Parameters ◽

Group I ◽

Oil Source

The oil–oil and oil–source rock correlations, also termed as geochemical correlations, play an essential role in the construction of petroleum systems, guidance of petroleum exploration, and definition of reservoir compartments. In this study, the problems arising from oil–oil and oil–source rock correlations were investigated using chemometric methods on oil and source rock samples from the WZ12 oil field in the Weixinan sag in the Beibuwan Basin. Crude oil from the WZ12 oil field can be classified into two genetic families: group A and B, using multidimensional scaling and principal component analysis. Similarly, source rocks of the Liushagang Formation, including its first, second, and third members, can be classified into group I and II, corresponding to group B and A crude oils, respectively. The principle geochemical parameters in the geochemical correlation for the characterisation and classification of crude oils and source rocks were 4MSI, C27Dia/C27S, and C24 Tet/C26 TT. This study provides insights into the selection of appropriate geochemical parameters for oil–oil and oil–source rock correlations, which can also be applied to other sedimentary basins.

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