估算薄层厚度的比例因子K的确定

The determination of scale factor K in the evaluation of thin-bed thickness

石油物探局物探地质研究院, 涿州072751

Geophysical Rcscarch Institutc.Burcau of Oil Gcophysical Prospccting, Zhuozhou 072751

本文论述了在特定的条件下, 利用振幅与厚度成线性关系(ΔH=K·A), 估算薄砂层厚度的基本原理和方法, 重点阐述了比例因子K的两种求取方法：(1)在有井控制的情况下, 采用算术平均法, 即K／N(N为采用的井数), 求得比例因子K;(2)在无井控制的砂层情况下, 采用比例因子K依赖于反射系数R的大小的变化规律K₁R₁=K₂R₂, 求得比例因子K。K值的求取是估算薄层厚度的关键, 文中列举了厚度估算的应用实例。

Considering the linearity of amplitude to thickness under certain circumstances,we describe the principle and methods of evaluation of sand thin-bed, giving emphasis to two methods of computing scale factor K: (1)with control wells,using method of average,i. e. K is the number of control wells); (2)without control wells,using the formula K₁R₁ = K₂R₂ (R1,R2are reflection coefficients). Since the computation of factor K is the crux in the evaluation of thinbed thickness,we present practical examples of the evaluation.