作　　者： ; ; ;

机构地区： 江汉石油学院

出　　处： 《江汉石油学院学报》 2003年第1期56-58,共3页

摘　　要： 采用对测井曲线作Fourier变换并绘制频谱-深度图的办法,来分析测井曲线中包含的高频旋回特征。测井曲线的滑动窗能谱分析揭示高频旋回沿井眼的频率变化。滑动窗能谱带的中断或干扰模式的出现,表示频率的突然变化,说明地层的不连续;滑动窗能谱带的逐渐转移,表示频率的逐渐变化,反映净沉积速率的逐渐变化。它们的旋回模式反映了被保存沉积旋回的厚度变化,即沿井眼向上方向能谱带逐渐向低频方向转移,反映一个向上变厚的序列,即向上净沉积速率增加;能谱带逐渐向高频方向转移,反映一个向上变薄的序列,即向上净沉积速率减小。这些变化特征有助于准层序的划分,进而分析地层层序。通过对一口井实际测井资料的研究和分析,说明方法的实用性。 High-frequency cyclical properties included in logs are analyzed by using the method ol well log Fourier transform and drawing the frequency-depth plot. The frequency change of the high-frequency cycle along the borehole is revealed by analyzing the sliding window spectrum of logging curves. The appearance of break of interference pattern of the sliding window spectral bands presents abrupt frequency changes, which indicates the stratigraphic discontinuity. Gradual shifting of the spectral bands indicates the gradual changes of frequency , which reflects the gradual changes of net depo-sitional rate. These cyclical patterns reflect the thickness variations of preserved depositional cycles, which means the spectral band shifts gradually toward low frequency direction along upward of a borehole, which reflects a thickening upward succession, which means upward net depositional rate increase. Gradual shifting of the spectral band toward high-frequency presents upward thickening succession , which means the upward net depositional rate decrease. The characteristics of these changes help classifying the stratigraphic sequence and analyzing the consequent stratigraphic sequence . Analyzing logging data from a well shows that the method is practical.

关 键 词： 测井曲线 滑动窗能谱 识别 地层 高频旋回特征

领　　域： [天文地球] [天文地球]