叠前深度偏移技术在焉耆盆地本东地区构造研究中的应用

Application of prestack depth migration technique in the study of structures in Bendong zone of Yanqi Basin

中国石化股份有限公司河南油田分公司,河南南阳473132

SINOPEC Henan Oilfield Company, Nanyang 473132, China

针对焉耆盆地逆冲断层复杂,地震纵、横向速度变化剧烈和成像困难等特点,首先从地质模型正演入手,确定适应复杂构造精确成像的叠前深度偏移方法,然后对叠前深度偏移处理中的叠前去噪、模型建立、层速度求取、模型优化等关键性技术进行研究,选择适合该地区地震资料特点的处理流程,最后得到的二维叠前深度偏移资料成像质量有明显提高,为焉耆盆地本东地区后期地震勘探方法的选择、井位确定和储量计算奠定了坚实的基础。

Seismic imaging is difficult in Yanqi Basin due to complex reverse thrusts and rapid variations of vertical and horizontal velocities. Prestack depth migration method that suitable for fine imaging of complex structures was selected based on forward modeling. Data processing flow was determined after a study of the key data processing steps such as prestack noise elimination, model building, calculation of interval velocity, optimization of model, etc. The resulting 2-D seismic data is of high quality, which facilitates the optimization of seismic exploration scheme, well placement, and calculation of reserves.