关键词: 顺北, 碳酸盐岩, 走滑断裂带, 断控缝洞储集体, 栅状结构, 井轨迹设计

Abstract: The ultra-deep carbonate reservoir is characterized by strong spatial heterogeneity, and the interpretation of the internal reservoir structure is limited by the accuracy of seismic data, leading to the difficulty in predicting the distribution of large-scale reservoirs. By taking Shunbei No.4 fault zone of the NE-trending fault system in the central part of Shunbei area as the study object, physical simulation experiment of reservoir formation by the fractured fault structure, fine calibration of well-seismic data, forward modeling, reservoir characterization and reservoir geological modeling are conducted. The study results show that multiple groups of fractured-cavity aggregates composed of cavities and fracture zones were developed near the fault plane. As a result, a structural model of grid reservoir in strike-slip fault is proposed, and the genetic mechanism and main controlling factors of grid reservoir in strike-slip fault are identified. An “integrated multi-grid” structure model of large-scale reservoir in fault zone is constructed, and the technology of spatial positioning of fault-controlled reservoir and the classified well trajectory design of “one well with multi-control, one well with one target and one well with multiple targets” is developed. The application of the study results has guided the well trajectory design in Shunbei No.4 and No.8 fault zones, realized the goal of “high output by drilling few wells” of complex fault-controlled fractured-cavity oil and gas reservoirs, and supported to add a new position with capacity of one million tons, which have certain guidance and reference significance for the exploration of ultra-deep fault-controlled reservoirs in other basins in China.