极复杂断块油藏精细地层对比方法研究及应用

Fine Stratigraphic Correlation Method in Extremely Complex Fault Block Reservoir

南堡1-3区为极复杂断块油藏,存在含油面积小、断裂发育、单井钻遇断点极多、地层缺失严重、标志层段较为集中且钻穿关系复杂、大斜度井多、地层倾角大等问题,极大地增加了地层对比难度。以“钻穿模式引导,沉积旋回划分、地震约束、模型验证”为特色的精细对比方法,总结钻遇模式指导分层,采用倾斜地层-加厚减薄对比模式,建立实钻垂厚与地层真厚度之间的关系,强调钻穿模式引导作用,遵循沉积旋回特征,利用井震模一体化综合验证,建立了钻穿关系复杂的极复杂断块精细地层对比格架,客观反映地层沉积变化,具有一定的推广使用价值。

Nanpu 1-3 area is an extremely complex fault block reservoir,which has many difficulties in exploration,such as small oil-bearing area,fault development,many breakpoints encountered in single well drilling,serious lack of strata,relatively concentrated marker intervals,many highly deviated wells and large formation dip angle.Characterized by“drilling through mode guidance,sedimentary cycle division,seismic constraint and model verification”,the fine correlation method summarizes the guide stratification,adopts the inclined formation thickening thinning correlation mode,establishes the relationship between the actual drilling vertical thickness and the true formation thickness.By emphasizing the drilling mode guidance stratification and keeping to sedimentary cycle feature,combined with the integrated verification of well seismic model,the fine stratigraphic correlation framework of the whole region is established to objectively reflect stratigraphic sedimentary changes,which lays a good foundation for subsequent research.