测井数据Matlab插值与地质旋回性分析应用

Application of interpolation of well logs based on Matlab to analysis of geological cyclicity

依据插值运算原理,基于Matlab软件平台提供的一维插值函数Interp1编程实现了测井数据的自动插值处理。在给定插值间隔和给定插值总数两种条件下,对济阳坳陷G1井二叠系地层井段录井图自然伽马(GR)曲线进行插值处理,并进行了小波分析解释。结果表明,测井数据插值处理后不仅具有高保真性,而且更便于多尺度地质解释。实例钻井剖面中共划分出8个小尺度旋回、4个中尺度旋回和2个大尺度旋回,验证了Matlab插值运算程序的有效性和实用性。

Based on the interpolation theory,a computer routine composed of the interpolation function Interp1 on Matlab platform was written to realize the interpolation of well logs automatically.The GR curve of part of Permian strata of well G1 in Jiyang depression was interpolated with the computer routine in both cases of interpolation with given interval and with given total number of data,and thereafter wavelet analysis of the interpolated well logs was carried on.The results show that the interpolated well logs are of high fidelity compared with the original on the one hand and more convenient for multi-scale geological interpretation,on the other hand.8 small-scale cycles,4 medium-scale cycles and 2 large-scale cycles are classified in the case well profile,which verified the validity and practicability of the Matlab routine.