石油地球物理勘探2025，Vol.60Issue(6)：1463-1472,10.DOI:10.13810/j.cnki.issn.1000-7210.20250047
复杂山前带叠前深度偏移成像关键技术研究
Key technologies for pre-stack depth migration imaging of complex piedmontz zones:A case study of Kepingnan area in Tarim Basin
摘要
Abstract
In recent years,the Keping fault uplift in Tarim Basin has emerged as a significant breakthrough zone for hydrocarbon exploration,where well-developed high-quality source rocks coexist with complex structural settings,creating a unique exploration environment.The combination of intense surface relief,pronounced ve-locity contrasts from shallow high-velocity rock masses,and multi-phase superimposed fault systems has led to technical bottlenecks in conventional seismic imaging methods,including substantial static correction errors,low velocity modeling accuracy,and structural distortion.This study systematically investigates key pre-stack depth migration(PSDM)technologies tailored for piedmont zones based on geological characteristics of the 3D seismic survey in the Kepingnan area.Three main innovations are presented:① Integrated shallow layer mo-deling technology.To address near-offset data deficiencies caused by complex surface acquisition geometries,this paper develops a constrained tomographic inversion algorithm integrating uphole survey data with wide-azi-muth seismic information was developed.This approach effectively enhances shallow velocity model accuracy while overcoming velocity-thickness coupling limitations inherent to conventional methods.② True surface mi-gration datum construction technology.By optimizing surface-consistent static correction schemes and imple-menting high-frequency static correction time-difference correction,the paper establishes a dynamic matching mechanism between true surface elevation and migration datum was established.This innovation significantly mitigates topographic effects on wavefield continuation and improves structural fidelity in steeply dipping strati-graphic imaging.③ Multi-scale velocity iterative inversion technology.The paper develops a multi-azimuth grid tomography method incorporating structural constraints.Through azimuth-dependent hierarchical inversion strategies,this technique achieves synergistic improvements in both vertical and lateral velocity resolution,pro-viding precise velocity models for deep nappe structures and buried fault systems.Field applications demon-strate that this technology system substantially enhances imaging quality of depth-migrated seismic data in Kepingnan area.Target horizons exhibit improved signal-to-noise ratios with clearer fault imaging and more ac-curate structural configurations.The proposed methodology provides an effective technical solution for hydro-carbon exploration in complex piedmont zones,offering practical value for advancing regional exploration prog-ress.关键词
浅表层联合建模/真地表偏移/多尺度速度迭代反演/多方位网格层析/柯坪南地区Key words
shallow surface joint modeling/true surface migration/multi-scale velocity iterative inversion/multi-azimuth grid tomography/Kepingnan area分类
天文与地球科学引用本文复制引用
DUAN Ye,CHEN Yongquan,HUANG Fan,LIU Chengxin,CHENG Yan,ZHANG Hao..复杂山前带叠前深度偏移成像关键技术研究[J].石油地球物理勘探,2025,60(6):1463-1472,10.基金项目
本项研究受深地国家重大专项基金项目"典型盆地天然氢气成藏模式与主控因素"(2025ZD1010303)资助. （2025ZD1010303）
