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<p>Oilfield M currently has a comprehensive water cut of 73.2% after more than 20 years of development, the reservoir is experiencing both edge-bottom water flooding and injection water flooding, with diverse types of injected water and complex flooding patterns, necessitating the research on logging evaluation methods for water-flooded layers. By introducing the variable multiple injection water material balance theory and combining it with the rock-electric relationship, an analysis of the water flooding mechanism in the study area was conducted. This led to the establishment of the variation characteristics between formation resistivity, water production rate, and saturation under different reservoir types and different salinities of injected water in the area; using the semi-permeable membrane capillary pressure experiment, the relationship between the original formation resistivity and the oil column height was established, deriving the relationship between the water production rate and the formation resistivity drop rate, combining the analysis of the water flooding mechanism mentioned above, allowing for a quantitative assessment of the level of water flooding; optimizing the mixed formation water resistivity calculation model to accurately determine parameters such as remaining oil saturation and water production rate, a set of identification and quantitative evaluation methods for water-flooded layers in Oilfield M was formed. The interpretation accuracy reached 87.5%, providing strong technical support for selecting perforation layers in the oilfield and avoiding highly flooded layers. This is of significant application value for the remaining oil evaluation and efficient development of water-flooded layers in overseas clastic rock oilfields.</p>

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Research on the Mechanism of Complex Water-flooded Layers and Well Logging Evaluation Methods in the M Oilfield

  • 期刊论文

  • 发表日期：

    2025年7月15日

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  • Wen-Yuan He,
  • Ya-Dong Wu,
  • Li-Xiang Feng,
  • Chang-Xi Li,
  • Jin-Bin Wan,
  • Guo-Hui Ni

摘要

Oilfield M currently has a comprehensive water cut of 73.2% after more than 20 years of development, the reservoir is experiencing both edge-bottom water flooding and injection water flooding, with diverse types of injected water and complex flooding patterns, necessitating the research on logging evaluation methods for water-flooded layers. By introducing the variable multiple injection water material balance theory and combining it with the rock-electric relationship, an analysis of the water flooding mechanism in the study area was conducted. This led to the establishment of the variation characteristics between formation resistivity, water production rate, and saturation under different reservoir types and different salinities of injected water in the area; using the semi-permeable membrane capillary pressure experiment, the relationship between the original formation resistivity and the oil column height was established, deriving the relationship between the water production rate and the formation resistivity drop rate, combining the analysis of the water flooding mechanism mentioned above, allowing for a quantitative assessment of the level of water flooding; optimizing the mixed formation water resistivity calculation model to accurately determine parameters such as remaining oil saturation and water production rate, a set of identification and quantitative evaluation methods for water-flooded layers in Oilfield M was formed. The interpretation accuracy reached 87.5%, providing strong technical support for selecting perforation layers in the oilfield and avoiding highly flooded layers. This is of significant application value for the remaining oil evaluation and efficient development of water-flooded layers in overseas clastic rock oilfields.