聚类分析方法在测井曲线重构中的应用

由于受地质和钻井技术条件所限,在探井时存在井眼垮塌等现象,对测井约束反演的结果会产生很大的影响。为消除各种影响,得到反映地层真实物性的测井曲线,笔者运用聚类分析方法来重构纵波、密度、横波曲线,该方法突破了常规的岩石物理方法框架,以一种统计学的角度来提高反演的精度。S-W工区的S5井及P工区的P3井运用效果表明,运用该方法重构的曲线制作合成记录取得的效果较好。在P3井中,重构的纵波速度与密度求取的纵波阻抗曲线所获得的合成记录道与原始地震记录道的相关性由非重构的0.59提高到0.84。

Application of clustering analysis in well logging curve reconstruction

Due to the restrictions of geological and drilling technology conditions，the phenomenon of borehole collapse often exists in wildcat，which has a great impact on the results of logging constrained inversion． In order to elminate the effect of the borehole collapse and obtain well logging curve that reflect the true properties of the forma- tion，the method of cluster analysis is applied to reconstruct longitudinal waves，density and shear waves in this pa- per，and this method is not limited to the conventional method of rock physics framework，but to improve the accu- racy of inversion in a statistical perspective． The application effect of Well S5 in S-W work area and Well P3 in P work area shows that the effect of synthetic seismogram made by reconstructed curve is good． In the Well P3，the relevance between the original seismic traces and the synthetic track which is obtained by the impedance curve calculated by the reconstructed P- wave velocity and density，is increased from non- reconstructed 0. 59 to 0. 84．