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The lacustrine carbonate deposits in the upper Member 4 of the Shahejie Formation (Es4s) in the Zhanhua Sag are widely distributed, with a large buried depth span and good exploration potential, which can be used as an important high-quality reservoir. However, the horizontal and vertical changes of reservoirs are fast, the accumulation is complex, the difference of rock characteristics and the unclear distribution of favorable reservoirs in each facies zone limit the exploration and development of oil fields. Comprehensive utilization of casting thin sections, core physical properties, scanning electron microscopy, CT scanning, T2 nuclear magnetic resonance and other test analysis, the carbonate reservoir space structure, pore throat structure, microscopic pore structure, high-quality reservoir main control factors were systematically studied. The research shows that the lacustrine carbonate reservoir in Es4s in the study area is dominated by limestone, which is a set of medium–low porosity-low permeability tight reservoirs. The primary pores are basically not developed. The reservoir space types are mainly fractures, intergranular pores, intergranular dissolved pores and matrix pores. The porosity range is distributed in 0.4–35.7% and the average porosity is 7.41%. The permeability range is distributed in 0.100mD–597.000mD and the average permeability is 9.121mD. The pore-throat sorting is poor, mainly micro pore-micro throat. The throat network, pore shape and pore connectivity of the reef margin samples are well developed, while the pore throat network, pore shape, connectivity and other core structures of the inter-shoal channel are relatively poor. Sedimentary facies control reservoir enrichment space. The reef core microfacies has the best reservoir physical properties, followed by the beach core microfacies, and the reef margin and beach margin microfacies are the worst. The fractures generated by tectonic action can effectively improve the reservoir performance, which is the key factor to find high-quality reservoirs.

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Characteristics of Lacustrine Carbonate Reservoirs: A Case Study of Es4s Layers of Shahejie Formation in Zhanhua Sag, Jiyang Depression

  • 会议论文

  • 发表日期：

    2025年

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  • Xiao-Yue Yang,
  • Bao-Hong Shi,
  • Zhao-Yong Ping,
  • Zhi-Qiang Li,
  • Bo Sun

摘要

The lacustrine carbonate deposits in the upper Member 4 of the Shahejie Formation (Es4s) in the Zhanhua Sag are widely distributed, with a large buried depth span and good exploration potential, which can be used as an important high-quality reservoir. However, the horizontal and vertical changes of reservoirs are fast, the accumulation is complex, the difference of rock characteristics and the unclear distribution of favorable reservoirs in each facies zone limit the exploration and development of oil fields. Comprehensive utilization of casting thin sections, core physical properties, scanning electron microscopy, CT scanning, T2 nuclear magnetic resonance and other test analysis, the carbonate reservoir space structure, pore throat structure, microscopic pore structure, high-quality reservoir main control factors were systematically studied. The research shows that the lacustrine carbonate reservoir in Es4s in the study area is dominated by limestone, which is a set of medium–low porosity-low permeability tight reservoirs. The primary pores are basically not developed. The reservoir space types are mainly fractures, intergranular pores, intergranular dissolved pores and matrix pores. The porosity range is distributed in 0.4–35.7% and the average porosity is 7.41%. The permeability range is distributed in 0.100mD–597.000mD and the average permeability is 9.121mD. The pore-throat sorting is poor, mainly micro pore-micro throat. The throat network, pore shape and pore connectivity of the reef margin samples are well developed, while the pore throat network, pore shape, connectivity and other core structures of the inter-shoal channel are relatively poor. Sedimentary facies control reservoir enrichment space. The reef core microfacies has the best reservoir physical properties, followed by the beach core microfacies, and the reef margin and beach margin microfacies are the worst. The fractures generated by tectonic action can effectively improve the reservoir performance, which is the key factor to find high-quality reservoirs.