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利用单井自然电位(SP)测井曲线经coif5小波变换,结合露头剖面传统层序地层划分标准,探讨了小波变换曲线与鄂尔多斯盆地南部A井三叠系陆相延长组三级层序界面的对应关系。结果显示,SP测井曲线经coif5小波变换后的d12小波(SP_coif5_d12)极大值可能对应湖退—湖侵旋回转换面(即层序界面);而小波曲线的极小值对应最大湖泛面,SP_coif5_d12小波可以作为湖盆的三级层序划分指标,说明coif5小波变换极值点位置检测到的SP测井信号与层序界面具有对应关系。该方法非常简捷,在陆相湖盆层序地层研究中具有实际应用价值,尤其适于缺乏岩心和地震等资料的单井研究。
Based on the coif5 wavelet transform and the standard of outcrop profile conventional sequence stratigraphy, the curve of single-well natural potential (SP) logging curves was discussed and the relationship between the wavelet transform curve and the third-order sequence interface of the Triassic terrestrial Yanchang Formation in Well A, southern Ordos Basin Corresponding relationship. The results show that the maxima of SP12 logarithm of d12 wavelet (SP_coif5_d12) after the coif5 wavelet transform may correspond to the lake-transgression cyclone conversion surface (ie, sequence boundary surface), while the minimum value of the wavelet curve corresponds to the maximum lacustrine surface The SP_coif5_d12 wavelet can be used as the third-level sequence index of lake basin, which shows that the SP logging signal detected by the coif5 wavelet transform extremum has a corresponding relationship with the sequence boundary. The method is very simple and has practical value in the study of sequence stratigraphy of continental lacustrine reservoirs. It is especially suitable for single well studies lacking core and seismic data.