静校正量的评价思路

静校正评价是复杂地表区地震资料处理的一项重要工作。提出了从建模技术适应性、建模过程的质量控制、实际资料应用效果3个方面评价静校正量的思路。利用地质地貌、小折射与微测井等资料以及大炮初至特征等,建立对近地表特征的认识,判断建模技术的适应性。建模过程严格的质量控制是建立可靠近地表模型的重要保证。静校正量应用效果可以判断高频分量的精度以及幅度较大的中频分量误差。给出了复杂地表区建模技术适应性分析实例,分析了工区近地表特征,结果表明工区西部的部分区域近地表结构特别复杂,仅靠很少几口微测井资料约束下的初至层析技术很难得到较高精度的静校正量。

Approach to statics appraisal

Statics appraisal is an important step in processing seismic data with complicated near surface conditions.It was proposed that three factors should be taken into consideration in appraising statics,including adaptability of near surface modeling methodology to the work area,QC in building Near Surface Model (NSM) and application of statics in seismic data.The foundation step is to evaluate the adaptability by analyzing near surface velocity features based on available NSM related information,including geological and geomorphological data,uphole and weathering refraction characteristics etc.Strict QC is another important factor for getting a reliable NSM.The application of statics in processing can identify the precision of short-wavelength statics and recognize certain middle-wavelength residual statics with obvious relief.An adaptability analysis example of modeling technique in complex surface area was presented,and the near surface characteristics were analyzed.In some region of the west work area,the near surface velocity structure is complicated,and it is difficult to obtain relatively high-precision statics by adopting first break tomography technology constrained by several upholes.