Abstract

The ultrasonic compressional (Vp) and shear (V,) ve­ locities and first-arrival peak amplitude (A p ) were mea­ sured as functions of differential pressure to 50 MPa and to a state of saturation on 75 different sandstone samples, with porosities ranging from 2 to 30 percent and volume clay content C ranging from 0 to 50 per­ cent, respectively. Both V p and V, were found to corre­ late linearly with porosity and clay content in shaly sandstones, At confining pressure of 40 MPa and pore pressure of 1.0 MPa, the best least-squares fits to the velocity data are

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