叠前深度偏移技术在奎屯南构造成像中的应用

奎屯南背斜位于准噶尔盆地南缘第三排构造带.由于山前带地质条件复杂,地层速度横向变化大,常规处理地震资料难以可靠落实该构造.叠前深度偏移处理能够克服常规处理技术的缺陷,是落实复杂地质构造的重要手段.利用叠前深度偏移技术,可靠落实了奎屯南背斜构造,钻探结果表明效果显著.通过本次处理与研究,获得叠前深度偏移处理技术的有效性、处理解释一体化的必要性及引起准噶尔盆地南缘速度异常、地震勘探难度大的几个因素等结论.

THE APPLICATION OF PRESTACK DEPTH MIGRATION IN KUITUN-NAN STRUCTURAL IMAGING

Kuitun-nan anticline lies in the third row structural zone in the southern margin of Junggar basin. It is difficult to credibly prove the structure by the general processing seismic data due to the complex geologic condition and the large difference of transverse stratum velocity in the piedmont. Prestack depth migration is an important technique to prove the structure because it has overcome limitations of general processing. By using prestack depth migration, the structure of Kuitun-nan anticline has been proved effectively because the drilling has shown a good effect. As a result of this work, the validity of prestack depth migration, the need of incorporate processing and explaining along with some factors that caused exceptional velocity and difficult seismic exploration in the southern margin of Junggar basin are educed.