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ZHU Huahui，CHEN Jiaxu，ZHANG Jiaoyang，et al. Geochemical characteristics and sedimentary environment of the Middle Section of Es1 source rocks in the Binhai Slope, Qikou Sag[J]. Bulletin of Geological Science and Technology，2025，44（3）：1-14 doi: 10.19509/j.cnki.dzkq.tb20240651
Citation: ZHU Huahui，CHEN Jiaxu，ZHANG Jiaoyang，et al. Geochemical characteristics and sedimentary environment of the Middle Section of Es1 source rocks in the Binhai Slope, Qikou Sag[J]. Bulletin of Geological Science and Technology，2025，44（3）：1-14 doi: 10.19509/j.cnki.dzkq.tb20240651
shu

Geochemical characteristics and sedimentary environment of the Middle Section of Es1 source rocks in the Binhai Slope, Qikou Sag

doi: 10.19509/j.cnki.dzkq.tb20240651

  • PetroChina Dagang Oilfield Company, Tianjin 300280, China

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    Abstract
  • Objective

    The geochemical characteristics and sedimentary environment of the Middle Section of Es1 source rocks in the Binhai Slope were less well studied, which restricts the expansion of hydrocarbon exploration into the sea area.

    Methods

    Based on the newly drilled source rock samples from the Binhai Slope, the geochemical characteristics, depositional environments, and developmental models of the middle section of Es1 source rocks were systematically investigated by means of petrographic pyrolysis, gas chromatography-mass spectrometry of saturates, and elemental logging techniques.

    Results

    The results show that the middle section of Es1 source rocks in the Binhai Slope are mainly Ⅱ1-Ⅱ2 kerogen, with TOC values ranging from 0.21% to 8.61%, an average TOC of 2.41% and an average S1+S2 of 9.73 mg/g, and are dominated by good–high quality source rocks. The middle section of Es1 source rocks are in the low maturity–mature stage, with Ro values ranging from 0.58% to 1.32%. The organic matter of the middle section of Es1 source rocks in the Binhai Slope originated from a mixture of terrestrial plants and aquatic organic matter, developed in a weakly oxidizing–weakly reducing freshwater environment. During the depositional period, the lake water in the basin was relatively deep, the climate is warm and humid, and the paleo-productivity of the lake water is at high level.

    Conclusion

    The Middle Section of Es1 source rocks in the Binhai Slope are of good organic matter type, with high organic matter abundance and moderate maturity. The sedimentary environment was conductive to the enrichment and preservation of organic matter, and the Middle Section of Es1 source rocks in the Binhai Slope have strong hydrocarbon generating capacity and exploration potential.

     

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