天然气勘探与开发2025，Vol.48Issue(4)：50-59,10.DOI:10.12055/gaskk.issn.1673-3177.2025.04.005
基于地震优势信息和地层切片技术的构造成图新方法
A novel method for structural mapping based on dominant seismic information and stratigraphic slicing technology
摘要
Abstract
In order to improve the accuracy of sub-sand layer group structural maps for target point optimization,geosteering,and reserve estimation during field development,a fine interpretation for sandbody top-bottom surfaces was completed and a time structure map was obtained using the dominant seismic information gradient-90° phase shift technology.Constrained by both well-point velocities and the lateral variation trend of seismic velocities,depth structure maps of the sandbody top-bottom surfaces were generated adopting a variable-velocity mapping method.By using the depth-domain seismic stratigraphic slicing technology,slices adjacent to the target layer were extracted.Through well-point horizon calibration,the depth structure maps of sub-sand layer groups were ultimately obtained.The results show that,(i)compared with the conventional well-point horizon calibration methods,the new approach significantly improves the accuracy of structure maps,with an absolute structural error of only 4 m in drilled wells;(ii)the planar distribution of sandbodies can be accurately depicted based on the sub-layer structure to guide the trajectory optimization of development wells,increasing the drilling encounter rate of high-quality thick reservoirs to 65%;(iii)the AVO gradient-90° phase shift technology effectively addresses the challenge of identifying"dim spot"reservoirs in the mid-deep layers,enhancing the reflection clarity of sandbody top and bottom;and(iv)the variable-velocity mapping technology reduces the structural error caused by the lateral velocity variations by integrating well-seismic velocities with structural trends.It is concluded that the interlayer structural mapping technology can significantly enhance the structure prediction accuracy of sub-sand layer groups,and it provides a reliable technical support for the efficient development of ultra-low permeability gas reservoirs.关键词
地震优势信息/相移技术/变速成图/地层切片/深度预测/亚砂层组/构造误差/甜点钻遇率Key words
Dominant seismic information/Phase shift technology/Variable-velocity mapping/Stratigraphic slicing/Depth prediction/Sub-sand layer group/Structural error/Sweet spot drilling encounter rate分类
能源科技引用本文复制引用
段冬平,娄敏,刘江,涂齐催,汪文基,李文俊,李炳颖,吴啸啸..基于地震优势信息和地层切片技术的构造成图新方法[J].天然气勘探与开发,2025,48(4):50-59,10.基金项目
中海石油(中国)有限公司重大科技项目"东海低渗大气田高效开发关键技术研究与示范应用"(编号:KJZX-2024-0102) （中国）
