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The FN oilfield in Iraq is a low porosity and ultra-low permeability carbonate reservoir. Due to the poor reservoir property, only three wells were successfully put into production from 1976 to 2020, resulting in poor development effect. By analyzing the production and well testing data, it was found that some high yield wells have the characteristics of dual pore media, determining the contribution of fractures to the improvement of reservoir properties and production capacity in the oilfield. In order to explore the development mechanism of fractures in the oilfield and achieve fine characterization of fractures, firstly, regional stress analysis was conducted to clarify that the strong compressive stress in the NNE-SSW direction during the Miocene was the main controlling stress of the regional structure; Secondly, the quantitative evaluation of regional compression deformation using the “height/width” of the anticline was applied, and a high correlation coefficient was obtained by regressing with the density of faults and fractures. It is believed that the development of fractures in the region is mainly controlled by compression stress, and the difference in local compression deformation controls the heterogeneous development of fractures; Thirdly, in order to quantitatively evaluate the structural deformation of the oilfield, the maximum curvature attribute of the structural plane was extracted, and the high curvature area was coupled with the chaotic area of coherent body slice to determine the dominant development area of fractures; Fourthly, the regional compression deformation is divided into three stages: early stage, start-up stage, and strong compression stage. The characteristics of tectonic activity in different stages and the associated dominant fracture types, dip angles, trends, and distributions are analyzed, based on which the oilfield is further subdivided into five fracture zones; Fifthly, based on the characteristics of trends in different zones, the parameters were set to achieve fine characterization of fractures by using seismic ant bodies. Practice has proven that the accuracy of this method in characterizing fractures can reach up to 80%, which greatly enhanced the oilfield’s production capacity.

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Development Mechanism and Fine Characterization of Fractures in Carbonate Reservoir of FN Oilfield in Iraq

  • 会议论文

  • 发表日期：

    2025年

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  • Lin Guosong,
  • Cao Shuchun,
  • He Juan,
  • Li Chunpeng,
  • Hui Chen

摘要

The FN oilfield in Iraq is a low porosity and ultra-low permeability carbonate reservoir. Due to the poor reservoir property, only three wells were successfully put into production from 1976 to 2020, resulting in poor development effect. By analyzing the production and well testing data, it was found that some high yield wells have the characteristics of dual pore media, determining the contribution of fractures to the improvement of reservoir properties and production capacity in the oilfield. In order to explore the development mechanism of fractures in the oilfield and achieve fine characterization of fractures, firstly, regional stress analysis was conducted to clarify that the strong compressive stress in the NNE-SSW direction during the Miocene was the main controlling stress of the regional structure; Secondly, the quantitative evaluation of regional compression deformation using the “height/width” of the anticline was applied, and a high correlation coefficient was obtained by regressing with the density of faults and fractures. It is believed that the development of fractures in the region is mainly controlled by compression stress, and the difference in local compression deformation controls the heterogeneous development of fractures; Thirdly, in order to quantitatively evaluate the structural deformation of the oilfield, the maximum curvature attribute of the structural plane was extracted, and the high curvature area was coupled with the chaotic area of coherent body slice to determine the dominant development area of fractures; Fourthly, the regional compression deformation is divided into three stages: early stage, start-up stage, and strong compression stage. The characteristics of tectonic activity in different stages and the associated dominant fracture types, dip angles, trends, and distributions are analyzed, based on which the oilfield is further subdivided into five fracture zones; Fifthly, based on the characteristics of trends in different zones, the parameters were set to achieve fine characterization of fractures by using seismic ant bodies. Practice has proven that the accuracy of this method in characterizing fractures can reach up to 80%, which greatly enhanced the oilfield’s production capacity.