固定剥离面静校正技术在山前带模型试验中的应用研究

Application study on fixed striping-surface statics technique in pied- mont zone model experiment

分析了山前带地区近地表地震地质条件的特点,探讨了影响山前带地区构造不确定的因素,在此基础上提出了固定剥离面静校正处理技术。设计了一个典型的山前带二维速度模型,基于其数值模拟数据,对固定剥离面静校正技术的剥离量、剥离深度、充填速度进行了分析,并讨论了应用该技术的必要性。将该静校正技术应用于正演模拟数据的深度偏移处理中,并与常规静校正技术得到的深度偏移剖面进行了对比分析,结果表明,该技术能有效地提高近地表静校正精度、速度分析精度和构造落实的可靠性。

The characteristics of near surface seismic geologic conditions at piedmont zone were analyzed,and the factors causing the uncertainty of structures imaging in piedmont zone were probed.On the basis,fixed stripping-surface statics technique was proposed,a typical 2-D velocity model of piedmont zone was designed.Then,based on numerical simulation data,the overburden amount,stripping depth,filling velocity and the necessity for applying fixed stripped-surface statics was analyzed.The proposed statics technique was used in depth migration,and the result was compared to the depth migration profile after conventional statics technique.The results showed that the proposed technique can effectively improve the accuracy of near surface statics,the accuracy of velocity analysis,and the reliability of structure imaged.