二阶同步提取变换的沉积旋回界面定位与追踪识别

Location and tracking of sedimentary cycle interface based on second order synchronous extraction transform

针对实际测井资料划分沉积旋回时,预测无井位点地区旋回单元的的限制问题,构建一系列沉积旋回组合的地质模型,通过二阶同步提取变换分析正演模拟结果的频率特征,探求沉积旋回界面追踪方法。结果表明:二阶同步提取变换方法得到的时频谱时频分辨率高,鲁棒性较好;对于旋回单元的顶界面的弱能量信号具有更高的灵敏度;通过设定人工辅助矫正方案,能够将相对误差控制在30%之内,进一步提高追踪结果的准确度。

This paper attempts to solve the limitation problem of predicting the cyclonic unitin the area without well location when dividing the sedimentary cyclonic data by inter-logging.The study consists of constructing a series of geological models of sedimentary cyclonic combinations;analyzing the time-frequency characteristics of the orthorectified simulation results by the second-order simultaneous extraction transformation;and exploring the tracking method of sedimentary cyclonic interface.The results show that the time-frequency spectrum obtained by the second-order simultaneous extraction transformation method has high time-frequency resolution and better robustness;and higher sensitivity to the weak energy signal at the top interface of the cyclonic unit.The relative error can be controlled within 30% by setting an artificially assisted correction scheme,which improves the accuracy of the tracking results even further.