利用地震资料Hilbert-Huang变换划分沉积旋回

沉积旋回是指沉积作用和沉积条件按相同的次序不断重复沉积而组成的一个层序，对地层层序的划分关键是正确划分沉积旋回。利用Hilbert-Huang变换（HHT）对测井曲线进行处理，然后划分沉积旋回，是较常用的一种方法，其对井点处的沉积旋回划分较准确，但在无井之处的沉积旋回划分受到了限制。为此，尝试将地震信号进行经验模态分解后，将其结果用于沉积旋回划分。通过分析正旋回、反旋回、正反旋回以及反正旋回等四种沉积旋回模型以及对应的Hilbert时频谱之间的关系可知，高频分量与GR、SP曲线的沉积旋回划分结果吻合较好，中、低频分量的沉积旋回划分结果与地层分界面基本一致。在此基础上，对研究区内井旁地震道进行处理，其沉积旋回划分结果与井资料（地质分层和测井曲线资料）的沉积旋回划分结果吻合较好，验证了文中方法的可靠性。最后，通过对连井剖面的分析，给出了有利砂体的预测范围。

Sedimentary cycle demarcation based on seismic Hilbert-Huang transformation

Sedimentary cycle is a result of the periodic occurrence of any depositional event. It is amaterial record of various depositional events in a certain time period. The key to stratigraphic sequence determination is to correctly demarcate sedimentary cycle. Common way to do so is to use logging data processed by Hilbert-Huang transformation (HHT). This method can only demarcate sedimentary cycle at well locations, but is usually restricted due to shortage of logging data. Therefore we propose sedimentary cycle demarcation based on seismic HHT. Empirical mode decomposition of seismic data is achieved by HHT, and strata spatial changes are obtained. We analyze 4 kinds of typical model of sedimentary cycle and their Hilbert spectrum. Application results on seismic data are consistent with that on logging data, which demonstrates the reliability of the proposed method.