Application Of Open Hole Acoustic Amplitude Measurements

Abstract

ment are included to illustra'te the effectiveness In acoustic velocity logging the phenomena of cycle skipping has been used to indicate the presence of fractures, etc. Since the cycle skips of interest are the result of attenuation of the acoustic signal, a measurement of formation amplitude is a more positive means for this purpose. In the field of acoustic bond logging the amplitude of the formation signal depends to a great extent upon the quality of bonding of cement to pipe and formation. By comparing the open hole acoustic amplitude to that in cased hole, the over-all effectiveness of the cement job may be more clearly distinguished.Test well data is included ·to show the degree of attenuation of the acoustic signal at solid, liquid interfaces as would be present in fractured formations. Field examples of this and other applications of amplitude measure-of the application.