静校正方法在黄土塬地区的联合应用

Joint application of statics methods in loess tableland

（1.中国地质大学（北京），北京100083；2.中国石油化工集团公司西南石油局第二物探大队采集技术研究所，四川德阳618000）

China University of Geosciences (Beijing),Beijing 100083,China

黄土塬地区静校正问题严重，一直是地震资料处理中的难题。针对黄土塬地区的近地表特征，基于地震资料分析，提出了联合应用多种静校正方法解决静校正问题的思路。首先应用模型初至反演静校正方法建立低、降速带结构，进行长波长静校正；然后利用折射初至交互迭代静校正方法求取中、短波长剩余静校正量；最后应用最大能量法、模拟退火法和遗传算法相结合的综合寻优方法，利用连续稳定强反射层的反射信息，求取短波长剩余静校正量。3种静校正方法的联合使用，有效地解决了黄土塬地区的静校正问题，剖面质量得到了较大改善，信噪比和振幅保真度均得到大幅度提高。

Serious statics problem in loess tableland is always a difficulty in seismic data processing.Aiming at the near surface characteristics in loess tableland,based on analysis on seismic data,we proposed an approach by jointly applying three statics methods to solve statics problem.Firstly,modelbased first break inversion statics method is applied to establish the structure of low-velocity and subweathered zone,and to carry out long-wavelength statics.Then,refraction first break interactive iteration statics is used to obtain middle and short wavelength residual statics.Finally,integrated global optimization method by combining maximum energy method,simulated annealing method and inherited algorithm is applied to gain shortwavelength statics from reflection information of continuously steady strong reflector.The joint application of the three methods can effectively solve the statics problem in loess tableland;profile was greatly improved,the S/N and amplitude preservation is greatly increased.