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Bohai A Oilfield is the first sandstone reservoir put into development in an igneous rock development area in Bohai. The main oil bearing layer in the oilfield is the Paleogene, which is affected by igneous rocks and has strong reservoir heterogeneity, the development situation of production wells at the edge of igneous rocks is poor. The quantitative characterization of reservoirs is difficult, it is affected by the high-yield strategy of offshore sparse wells, the well spacing is large. On the basis of summarizing the development characteristics of igneous rocks, this article comprehensively describes the micro pore structure characteristics of sandstone reservoirs in different regions of the oilfield through various analysis and testing methods such as petrography, high-pressure mercury injection, and nuclear magnetic resonance. Based on this, the quantitative transformation of sandstone reservoirs by igneous rocks is carried out based on the thermal-solid coupling effect. According to the distribution pattern of igneous rocks and the mutual positional relationship between reservoirs, Extracting a model of the contact relationship between igneous rocks and reservoirs, considering the influence of parameters such as thermal conductivity, reservoir skeleton deformation, and stress sensitivity, a mathematical model for quantitatively characterizing the permeability of sandstone reservoirs under the influence of igneous rocks was established. Finite element deformation was used to solve the problem, and a quantitative characterization diagram of the degree of volcanic activity on sandstone reservoirs was drawn. The research results indicate that the thermal baking effect of igneous rocks in Bohai A oilfield reduces the permeability of reservoirs around 100 m of igneous rocks. The closer to the boundary of igneous rocks, the more severe the decrease in reservoir permeability. Based on the research results, the three-dimensional geological model has been updated, and the numerical simulation accuracy has been improved from 70% to 92%. This provides a reference for reservoir evaluation and development plan design in similar oil fields..

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Research and Application of Quantitative Characterization Methods for Reservoirs Under the Shielding of Igneous Rocks

  • 会议论文

  • 发表日期：

    2025年

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  • Dong Ma,
  • Chao Li,
  • Ming Yang,
  • Jianli Yan,
  • Hanqing Zhao

摘要

Bohai A Oilfield is the first sandstone reservoir put into development in an igneous rock development area in Bohai. The main oil bearing layer in the oilfield is the Paleogene, which is affected by igneous rocks and has strong reservoir heterogeneity, the development situation of production wells at the edge of igneous rocks is poor. The quantitative characterization of reservoirs is difficult, it is affected by the high-yield strategy of offshore sparse wells, the well spacing is large. On the basis of summarizing the development characteristics of igneous rocks, this article comprehensively describes the micro pore structure characteristics of sandstone reservoirs in different regions of the oilfield through various analysis and testing methods such as petrography, high-pressure mercury injection, and nuclear magnetic resonance. Based on this, the quantitative transformation of sandstone reservoirs by igneous rocks is carried out based on the thermal-solid coupling effect. According to the distribution pattern of igneous rocks and the mutual positional relationship between reservoirs, Extracting a model of the contact relationship between igneous rocks and reservoirs, considering the influence of parameters such as thermal conductivity, reservoir skeleton deformation, and stress sensitivity, a mathematical model for quantitatively characterizing the permeability of sandstone reservoirs under the influence of igneous rocks was established. Finite element deformation was used to solve the problem, and a quantitative characterization diagram of the degree of volcanic activity on sandstone reservoirs was drawn. The research results indicate that the thermal baking effect of igneous rocks in Bohai A oilfield reduces the permeability of reservoirs around 100 m of igneous rocks. The closer to the boundary of igneous rocks, the more severe the decrease in reservoir permeability. Based on the research results, the three-dimensional geological model has been updated, and the numerical simulation accuracy has been improved from 70% to 92%. This provides a reference for reservoir evaluation and development plan design in similar oil fields..