微测井与常速约束建模折射静校正对比研究及应用效果

Contrastive study of refraction static correction based on inversion model constrained by micro-logging and by constant velocity and its application effect

在我国由于地震勘探的不断深入发展,加之对以往勘探区域的地质构造的进一步精细化勘探,尤其是地表条件复杂的西部大沙漠戈壁区域,其表层属于沙漠戈壁混合区,地表起伏较大,介质呈现典型的低降速性,且厚度大至几十米,造成严重的静校正问题,严重影响地震资料处理的成像质量,因此解决该区域的静校正问题尤为重要。通过表层微测井方法解释出的成果数据来约束建立反演模型进行折射静校正,并与固定常速约束反演模型折射静校正作对比,得出通过表层微测井约束的反演模型折射静校正效果较好,应用到实际地震数据处理中,得出的地震剖面较之固定常速约束反演模型折射静校正效果更好。

Due to the continuous development of seismic exploration and the further refinement of geological structure in the past exploration areas,especially in the western great desert Gobi area with complex surface conditions in China,the surface layer belonging to desert Gobi mixed area and the surface undulation is large.The medium of surface exhibits typical low deceleration and the thickness up to tens of meters,which caused serious static correction problems.The imaging quality of seismic data processing is then seriously affected.Therefore,it is particularly important to solve the problem of static correction in this region.In this paper,the refraction static correction is based on inversion model constrained by the result data of surface micro-logging compared with the refraction static correction based on inversion model constrained by constant velocity.We then concluded that the refraction static correction effect based on inversion model constrained by surface micro-logging is better,and applied to actual seismic data processing,the seismic profile is better than that of refraction static correction based on inversion model constrained by constant velocity.