基于测井曲线的小波分析识别地层岩性界面——以三江盆地钻孔为例

Stratigraphic Interfaces Identification Based on the Wavelet Transform of Geophysical Logging Data:A Case Study of Sanjiang Basin Drilling

在砂岩型铀矿地浸工作中,需要精准的识别含铀渗透性地层的岩性界面。传统的地层岩性界面识别一般通过岩心地质观察、实验室分析和综合测井曲线的人工解释等手段,不仅价格高而且周期长。文章以三江盆地ZKQX2钻孔为例,介绍了对三侧向电阻率测井曲线进行连续小波和离散小波变换,绘制小波系数尺度图和高频小波系数曲线图,并综合这两种图件来识别地层岩性界面的方法。将使用该方法识别地层岩性界面的结果与综合岩性柱状图对比,两者具有很好的一致性,表明利用测井曲线的小波分析识别地层岩性界面具有良好的应用效果。

In the in-situ leaching of sandstone-type uranium deposit,it is necessary to accurately identify the formation interface.In the paper,continuous and discrete wavelet transform was performed on logging data of borehole ZKQX2 in Sanjiang Basin of Heilongjiang,the wavelet coefficient scalogram and high-resolution wavelet coefficient were used to identify the stratigraphic interfaces.The wavelet transform identified results were compared and corroborated by geological data,which suggests that the wavelet transform method produced a significantly effect.