【摘要】 横波速度是进行叠前地震反演和叠前地震属性分析的必要资料,但目前绝大多数钻井缺少横波测井资料,本文提出了一种简单但又涵盖了影响岩石地震波传播速度基本要素的横波速度预测方法,即通过对模量的Voigt上边界和Reuss下边界的加权平均来求取等效弹性模量,进而计算出横波速度,加权系数w本质上反映了组成岩石骨架的矿物颗粒与孔隙的几何性质,由纵波模量拟合得到。通过对四川盆地东北部Y井碳酸盐岩实际测井数据的处理,证明边界加权平均法能准确有效地预测出碳酸盐岩横波速度。更多还原

【Abstract】 The shear-wave velocity is a very important parameter in oil and gas seismic exploration,and vital in prestack elastic-parameters inversion and seismic attribute analysis. However,shearing-velocity logging is seldom carried out because it is expensive.This paper presents a simple method for predicting S-wave velocity which covers the basic factors that influence seismic wave propagation velocity in rocks.The elastic modulus of a rock is expressed here as a weighted arithmetic average between Voigt and Reuss bounds,where the weighting factor,w,is a measurement of the geometric details of the pore space and mineral grains.The S-wave velocity can be estimated from w,which is derived from the P-wave modulus.The method is applied to process well-logging data for a carbonate reservoir in Sichuan Basin,and shows the predicted S-wave velocities agree well with the measured S-wave velocities.更多还原