井约束非稳态相位校正方法

在地震勘探资料处理中，子波的零相位化有助于提高地震资料的分辨率、改善叠加剖面的质量.常规的相位校正方法是利用测井合成记录对井旁地震记录进行相位估计，然后对整条剖面进行常相位校正，该方法没有考虑地震子波相位的非稳态性（相位随时间和空间变化）.虽然通过局部相似度方法利用最大方差模准则或包络最大相似度准则可以估计出随时间和空间变化的相位属性，但是由于零相位判别准则本身具有一定的局限性，因此精度有限.针对这一问题，本文在局部地震属性和局部平面波模型下，提出了一种井约束的非稳态相位校正方法，该方法不仅考虑了子波相位的非稳态性，而且充分利用了测井合成地震记录进行相位校正精度高的优点.理论模型和实际资料处理表明，本文方法可以有效实现信号的零相位化，有利于改善叠加效果，提高资料的分辨率.

Well constrained non-stationary phase correction

Zero-phasing of wavelet is essential to improve the quality of stack profile and enhance the resolution of seismic data in seismic data processing. Conventional phase correction method estimates the phase of borehole-side seismic trace according to logging synthetic records and applies constant phase correction to the entire profile. The method has low precision as the non-stationary phase is not taken into consideration. Phase attribute varying with time and space can be estimated based on the criterion of local kurtosis maximization or local similarity maximization with the envelope, but these methods are restricted by the limitation of their criterion. Aiming to solve these problems, we proposed a new well constrained non-stationary phase correction method based on the local seismic attribute and local plane-wave model. The proposed method is more precise than conventional method. Experimental results with synthetic and field data show that the proposed method can effectively improve the quality of stack profile and enhance the resolution of seismic data after zero-phasing.