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Carbonate reservoirs generally exhibit strong heterogeneity and diverse types. Accurately describing the spatial style of reservoirs is crucial for the deployment and effective development of oil and gas reservoirs. The Lower Paleozoic-Sinian gas reservoir in the central part of the Sichuan Basin is a typical representative of strongly heterogeneous carbonate gas reservoirs. Based on comprehensive core, logging, seismic, and dynamic data, high-quality reservoirs have been selected and three spatial distribution styles of reservoirs have been established. The main understanding is that: (1) the vertical thick layer is concentrated and the horizontal continuous distribution type is mainly composed of fracture pore type reservoirs. High quality reservoirs are concentrated and developed, with a single layer thickness greater than 10 m and a horizontal extension of more than 5 km. (2) Vertical thick layer stacking development + horizontal continuous distribution type, fracture pore type and pore type reservoirs are interlaced, high-quality reservoirs are dispersed and developed, with a single layer thickness of 5–10 m and a horizontal extension of 2–5 km. (3) Vertical thin layer superimposed development + horizontal limited distribution type, mainly composed of needle hole matrix reservoirs, with high-quality reservoirs under development, with a single layer thickness of less than 5 m and a horizontal extension of less than 2 km. There are two innovative points: firstly, constructing a quantitative evaluation index system for high-quality carbonate reservoirs, indicating the research direction of reservoirs for development deployment; The second is to establish three types of reservoir spatial distribution styles, achieving a sub-stantial transformation of reservoir classification description from micro to macro, and from well points to spatial volume. Research significance: To provide a reference research method for deepening the understanding of strongly heterogeneous carbonate reservoirs, and to have important reference value for the deployment of oil and gas field well locations and the development of economies of scale.

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Classification and Description of Spatial Patterns in Strongly Heterogeneous Carbonate Reservoirs

  • 会议论文

  • 发表日期：

    2025年

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  • Chun Zhang,
  • Bing He,
  • Wei Liu,
  • Tao Li,
  • Jun Jiang,
  • Yu Pang

摘要

Carbonate reservoirs generally exhibit strong heterogeneity and diverse types. Accurately describing the spatial style of reservoirs is crucial for the deployment and effective development of oil and gas reservoirs. The Lower Paleozoic-Sinian gas reservoir in the central part of the Sichuan Basin is a typical representative of strongly heterogeneous carbonate gas reservoirs. Based on comprehensive core, logging, seismic, and dynamic data, high-quality reservoirs have been selected and three spatial distribution styles of reservoirs have been established. The main understanding is that: (1) the vertical thick layer is concentrated and the horizontal continuous distribution type is mainly composed of fracture pore type reservoirs. High quality reservoirs are concentrated and developed, with a single layer thickness greater than 10 m and a horizontal extension of more than 5 km. (2) Vertical thick layer stacking development + horizontal continuous distribution type, fracture pore type and pore type reservoirs are interlaced, high-quality reservoirs are dispersed and developed, with a single layer thickness of 5–10 m and a horizontal extension of 2–5 km. (3) Vertical thin layer superimposed development + horizontal limited distribution type, mainly composed of needle hole matrix reservoirs, with high-quality reservoirs under development, with a single layer thickness of less than 5 m and a horizontal extension of less than 2 km. There are two innovative points: firstly, constructing a quantitative evaluation index system for high-quality carbonate reservoirs, indicating the research direction of reservoirs for development deployment; The second is to establish three types of reservoir spatial distribution styles, achieving a sub-stantial transformation of reservoir classification description from micro to macro, and from well points to spatial volume. Research significance: To provide a reference research method for deepening the understanding of strongly heterogeneous carbonate reservoirs, and to have important reference value for the deployment of oil and gas field well locations and the development of economies of scale.