基于小波分析的精细地层划分对比在庄9井区的应用

Application of fine stratigraphic division and comparison based on wavelet analysis in Zhuang 9 block

为了满足庄9井区低渗透油藏描述中建立精细地层对比格架的要求,从研究区多种资料和小波系数模极值点、过零点与信号突变点数学模型出发,选用小波分析技术开展精细地层划分对比。通过对常规典型测井曲线小波变换,选用第3层细节信号重构测井曲线,将小波重构曲线与常规曲线结合起来,对比分析建立研究区精准地层对比剖面,并将此技术引入到储层隔夹层分析。研究表明,基于小波分析的地层划分对比与隔夹层分析结果可靠,满足高分辨率层序地层划分要求,效果好于传统的测井曲线分层对比方法。

For meeting the demand of building fine geologic correlation framework, the wavelet analysis technique was chosen to study the stratigraphic division and comparison, according to the plentiful data and the feature of mode extreme point of wavelet factor and zero crossing point and signal discontinuity model. By means of the wavelet changing on conventional logging curves, through selecting detail signals of third layer, log was reconstructed. Then the fine correlation section was built by combining the new log curves and the conventional log curves. Moreover, the technique was introduced for analysis of barrier and interbed. The study indicated that the result of stratigraphic division and comparison and analysis on barrier and interbed is reliable, the research meets well the demand of high definition sequence division, the effect is better than the traditional method.