Omega系统叠前深度偏移技术在平方王地区的应用

Application of prestack depthmigration techniques of Omega processing system in Pingfangwang area

胜利油田有限公司物探研究院, 山东东营257022

Geophysical Research Institute of Shengli Oilfield, Dongying 257022, China

叠前深度偏移是解决复杂构造成像问题的最有效手段。在分析叠前深度偏移的技术特点及实现过程的基础上,提出了以叠前精细处理、约束建模、剩余速度分析模型优化迭代及变孔径Kirchhoff偏移为核心的一套叠前深度偏移处理流程。利用Omega系统三维叠前深度偏移软件对平方王潜山实际资料的处理结果表明,潜山部位的成像效果有了明显的改进,归位准确,断点清楚,潜山顶面反射清晰可靠,与上覆地层的接触关系更加合理,潜山内幕的反射也有所加强。为本区下一步的勘探布署工作提供了有利的证据。

Prestack depthmigration is themost effective way to image complex structures.After an analysis of the technical characteristics of prestack depthmigration and its realization, a processing flow for prestack depthmigration was presented which includes key steps such as prestack fine processing, constrainedmodel construction, update of residual velocitymodel, and aperture variant Kirchhoffmigration. The results from application of 3 D prestack depthmigration techniques of Omega processing system to real seismic data from Pingfangwang area show that the image of buried hill is improved greatly. The image features correct inmigration, clear in breaking points and reflections from the top of buried hills.moreover, the contact relation to overlying formation ismore reasonable and the reflections under the curtain of buried hill are enhanced. These results provide favorable evidences for further exploration.