超级盆地成熟探区烃源岩再评价及其勘探意义: 以渤海湾盆地南堡凹陷古近系沙三段烃源岩为例

王政军; 马乾; 魏亚琼; 庄东志; 刘经纬; 马健; 高永亮

doi:10.3799/dqkx.2026.083

Volume 51 Issue 5

May 2026

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Article Navigation > Earth Science > 2026 > 51(5): 1636-1651

Wang Zhengjun, Ma Qian, Wei Yaqiong, Zhuang Dongzhi, Liu Jingwei, Ma Jian, Gao Yongliang, 2026. Re-Evaluation of Source Rocks in Mature Exploration Areas of Super Basins and Its Exploration Significance: A Case Study of Es3 Source Rock in Nanpu Sag, Bohai Bay Basin. Earth Science, 51(5): 1636-1651. doi: 10.3799/dqkx.2026.083

Citation:

Wang Zhengjun, Ma Qian, Wei Yaqiong, Zhuang Dongzhi, Liu Jingwei, Ma Jian, Gao Yongliang, 2026. Re-Evaluation of Source Rocks in Mature Exploration Areas of Super Basins and Its Exploration Significance: A Case Study of Es₃ Source Rock in Nanpu Sag, Bohai Bay Basin. Earth Science, 51(5): 1636-1651. doi: 10.3799/dqkx.2026.083

Citation:

Wang Zhengjun, Ma Qian, Wei Yaqiong, Zhuang Dongzhi, Liu Jingwei, Ma Jian, Gao Yongliang, 2026. Re-Evaluation of Source Rocks in Mature Exploration Areas of Super Basins and Its Exploration Significance: A Case Study of Es₃ Source Rock in Nanpu Sag, Bohai Bay Basin. Earth Science, 51(5): 1636-1651. doi: 10.3799/dqkx.2026.083

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Re-Evaluation of Source Rocks in Mature Exploration Areas of Super Basins and Its Exploration Significance: A Case Study of Es₃ Source Rock in Nanpu Sag, Bohai Bay Basin

doi: 10.3799/dqkx.2026.083

1.
School of Geosciences, Yangtze University, Wuhan 430074, China
2.
Jidong Oilfield Company, PetroChina, Tangshan 063004, China

Received Date: 2025-12-31
Publish Date: 2026-05-25

Abstract

Abstract

To investigate the geochemical characteristics and hydrocarbon accumulation contribution of high-quality source rocks in the Sha-3 Member of the mature exploration area in the Nanpu sag, Bohai Bay basin, a typical superimposed basin, this study evaluates the hydrocarbon generation potential of the source rocks based on data including total organic carbon (TOC), pyrolysis, organic elemental analysis, and vitrinite reflectance (R_o). Molecular geochemistry of the source rocks is characterized using GC-MS analysis of source rocks and crude oils, combined with hydrocarbon generation potential evaluation results. The quantitative oil-source correlation is established using biomarker parameter cross-plots to determine the accumulation contribution. Resource potential is assessed by integrating source rock logging evaluation, seismic prediction, and basin modeling. Research indicates that the Es₃ source rock in the Nanpu sag possesses high organic matter abundance, classifying it as a set of high-quality source rocks. The organic matter type is predominantly Type Ⅱ₁. Currently, this source rock suite is in the mature to high-mature stage, primarily generating light oil and condensate. Using biomarker parameter cross-plots, specifically C₂₄ tetracyclic terpane/C₂₆ tricyclic terpane versus C₃₀ 4-methylsterane/C₂₉ regular sterane, effectively distinguishes the four sets of main source rocks in the Nanpu sag. Oil-source correlation demonstrates that the oil in the deep Es₃ and Paleozoic buried hills surrounding the Linque and Caofeidian sub-sags is primarily sourced from the Es₃ source rocks. Favorable exploration targets include deep volcaniclastic rock reservoirs south of the Gaoliu fault within the Caofeidian and Linque sub-sags, deep structural-lithological and lithological reservoirs in the Es₁ and Es₃ members within the trough zones, and Ordovician residual hill buried hills and Cambrian internal buried hills. Additionally, the Es₃ source rocks in the southern slope zone have moderate burial depth and thermal evolution, and contain developed deep-water saline lacustrine carbonate laminae with high movable oil content, making this zone a favorable play for shale oil exploration.
- Nanpu sag,
- Es₃ Member,
- high-quality source rock,
- oil-source correlation,
- accumulation contribution,
- shale oil,
- petroleum geology

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References(64)

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Re-Evaluation of Source Rocks in Mature Exploration Areas of Super Basins and Its Exploration Significance: A Case Study of Es3 Source Rock in Nanpu Sag, Bohai Bay Basin

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Re-Evaluation of Source Rocks in Mature Exploration Areas of Super Basins and Its Exploration Significance: A Case Study of Es₃ Source Rock in Nanpu Sag, Bohai Bay Basin