复杂地表区浮动基准面计算方法的优化选取

在高精度三维地震资料及复杂地表区的地震数据处理中,通常使用浮动基准面校正法来消弱因近地表变化引起的静校正量影响,减少因静校正剧烈变化造成的反射波双曲线时距曲线畸变,从而提高地震资料的成像品质。本文对目前常用的浮动基准面计算方法——平均静校正量法和平滑地表法进行了分析与比较,认为平滑地表计算法更适合于高精度三维地震资料、地表高程起伏大、近地表低降速层厚度横向变化剧烈的复杂地表区地震资料。实际资料处理表明,该方法能够更可靠地反映地下地质构造形态。

The optimization and selection for the computing methods of floating datum in complex surface

For the 3D seismic data processing with high precision and complex surface,floating datum correction is usually used to eliminate the influence of statics caused by the change of near surface and to decrease the T-X curve deformation of reflected event hyperbola caused by the acute variation of static correction,so as to improve the imaging quality of seismic data.In the paper,the average statics and the smoothing surface used widely at present are analyzed and compared.The smoothing surface method is suggested to be more suitable for the complex surfaces such as 3D seismic data with high precision,the surface with great elevation and near surface low weathering layer thickness with great horizontal changes.The actual processed results show that the method can reflect more reliable subsurface geological structure feature.