多参数优化的模拟退火法波阻抗反演

Simulated annealing wave impedance inversion through multi-parameter optimization

(1.中国石油大学(北京)CNPC物探重点实验室，北京102249；2.中国石油集团东方地球物理勘探有限公司研究院，河北涿州072750)

CNPC Key Lab of Geophysical Prospecting, University of Petroleum, Beijing 102249, China

多参数优化的模拟退火法波阻抗反演是通过调整地震资料信噪比、相邻道的相关性、初始模型偏差、反射系数门槛值等约束条件进行地震资料反演的。该方法可以把对地质、物探和测井资料的认识结合到反演中，从而有效地监控反演的结果，得到能真正反映地层岩性的波阻抗。介绍了方法的基本原理，给出了方法实现的具体步骤，包括高分辨率处理、合成记录及层位标定、子波提取、初始模型建立、模拟退火反演和多参数约束条件的调整等。实际资料应用表明：①与常规波阻抗反演相比，该方法可以提高地震资料反演的分辨率；②原始地震数据相干体切片和波阻抗相干体切片的断层位置均与构造图的断层位置一致，与原始地震数据相干体切片相比，波阻抗相干体切片可为断层解释提供更好的依据。

Simulated annealing of multiparameters optimization is the simulated annealing wave impedance inversion with some constraints, including S/N ratio, adjacent-channel correlation, deviation of initial model, and threshold value of reflection coefficient. The method can remove noise by multichannel inversion, and has global optimum solutions. The principles of this method are introduced in this paper. The procedures are high-solution processing, synthetic seismogram and horizon calibration, wavelet extraction, initial model establishment, simulated annealing inversion, and adjustment of multi-parameters restraints. The actual data processing indicates that 1) compared to conventional wave impedance inversion, the method can improve the resolution of seismic data inversion, 2) the fault position in coherent slices of original data and coherent slices of wave impedance are coincide with that in structure maps, but the latter can provide a better criteria for fault interpretation than the former.