瞬时振幅相干法在储层预测中的应用

在砂泥岩速度差别小，甚至相互交叠，砂岩的自然伽玛值又偏高的情况下，常规的波阻抗加伽玛反演等方法难于准确确定砂体的展布特征。而瞬时振幅信息虽然与储层分布的关系密切，但抗噪能力较差，在断续问题上也容易造成人为误差。辽河盆地东部凹陷西斜坡沙河街组例子，是从瞬时振幅提取和相干分析的基本原理入手，运用瞬时振幅相干方法，通过井资料约束，实现了储层的横向分布预测。

The Application of Instantaneous Amplitude Coherence Analysis Method to Reservoir Prediction

In some area where the velocities in sandstone and mudstone are very close, and even are the same in some stratums, and the values of gamma well logging in sandstone are high that cannot be distinguished from mudstone's, the sandstone's characteristic spread cannot be detected in common ways of wave impedance inversion and gamma inversion. Though the instantaneous amplitude has something correlated with the reservoir distribution, human error may be made when recognizing the instantaneous amplitude information on account of noise. According to these problems, based on the instantaneous amplitude extraction and coherence analysis theories, instantaneous amplitude coherence analysis method is applied to the illustration area-the Shahejie formation, Western sope, Eastern sag, Liaohe basin. Under the restriction of well data, reservoir's landscape orientation prediction was reached with this method.