南海北部湾盆地乌石凹陷原油地球化学特征与油源对比

尹嘉; 魏琳; 侯读杰; 范彩伟; 满勇; 胡德胜

doi:10.3799/dqkx.2022.470

Volume 48 Issue 11

Nov. 2023

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Article Navigation > Earth Science > 2023 > 48(11): 4135-4152

Yin Jia, Wei Lin, Hou Dujie, Fan Caiwei, Man Yong, Hu Desheng, 2023. Geochemical Characteristics and Oil-Source Rock Correlation of Crude Oil in Wushi Sag, Beibuwan Basin, South China Sea. Earth Science, 48(11): 4135-4152. doi: 10.3799/dqkx.2022.470

Citation:

Yin Jia, Wei Lin, Hou Dujie, Fan Caiwei, Man Yong, Hu Desheng, 2023. Geochemical Characteristics and Oil-Source Rock Correlation of Crude Oil in Wushi Sag, Beibuwan Basin, South China Sea. Earth Science, 48(11): 4135-4152. doi: 10.3799/dqkx.2022.470

Citation:

Yin Jia, Wei Lin, Hou Dujie, Fan Caiwei, Man Yong, Hu Desheng, 2023. Geochemical Characteristics and Oil-Source Rock Correlation of Crude Oil in Wushi Sag, Beibuwan Basin, South China Sea. Earth Science, 48(11): 4135-4152. doi: 10.3799/dqkx.2022.470

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Geochemical Characteristics and Oil-Source Rock Correlation of Crude Oil in Wushi Sag, Beibuwan Basin, South China Sea

doi: 10.3799/dqkx.2022.470

Yin Jia^{1
,
,},
Wei Lin^{1
,
,},
Hou Dujie¹,
Fan Caiwei²,
Man Yong²,
Hu Desheng²

1.
School of Energy and Resources, China University of Geosciences, Beijing 100083, China
2.
Zhanjiang Branch, China National Offshore Oil Corporation (CNOOC), Zhanjiang 524057, China

Received Date: 2022-11-24
Available Online: 2023-11-30
Publish Date: 2023-11-25

Abstract

Abstract

To study the genetic relationship between oil and source rock in Wushi sag, geochemical analyses of crude oil and source rock samples were carried out in this paper. The results show that crude oils in Wushi sag can be classified into three groups: group Ⅰ crude oil is distributed in the Weizhou Formation and 1-member of Liushagang Formation reservoir in the deep sag belt. The maturity of this crude oil is relatively high, and the abundances of C₁₉ tricyclic terpenes, C₂₄ tetracyclic terpenes, and oleanane are relatively high, while the abundances of C₂₃ tricyclic terpenes and C₃₀ 4-methylsteranes are relatively low, which reflects the characteristics of double input of lower aquatic organisms and terrigenous higher plants. Group Ⅱ and group Ⅲ crude oil is mainly distributed in the 2-member and 3-member of the Liushagang Formation reservoir in the reversal tectonic belt and gentle slope belt, and their maturity is overall lower than that of group Ⅰ crude oil. The abundances of C₁₉ tricyclic terpanes, C₂₄ tetracyclic terpanes, and oleanane of these oils are relatively low, and the abundances of C₂₃ tricyclic terpanes and 4-methylsteranes are relatively high, indicating their parent material is mainly from lower aquatic organisms. The difference between the two groups of crude oils mainly lies in the Pr/Ph value and the stable carbon isotope characteristics of whole oil. Compared with group Ⅱ crude oil, group Ⅲ crude oil has a lower Pr/Ph value and lighter stable carbon isotope. The oil-source rock correlation shows that the group Ⅰ crude oil mainly comes from the upper sub-member of 2-member of Liushagang Formation source rock. Both group Ⅱ and group Ⅲ oils are derived from the lower sub-member of the 2-member of Liushagang Formation source rock.
- geochemical characteristics,
- biomarker compound,
- oil-source rock correlation,
- well drilling,
- Wushi sag,
- petroleum geology

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References(50)

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Geochemical Characteristics and Oil-Source Rock Correlation of Crude Oil in Wushi Sag, Beibuwan Basin, South China Sea

doi: 10.3799/dqkx.2022.470

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