BIOL 1209 Chapter : 20140408 155411
Document Summary
The velocity of sound in reservoir rocks is a useful property that can provide information on porosity, fluid content and elastic constants. Velocity is measured by the time it takes a sound wave to travel from a source (typically from a seismic survey or a well logging tool) and knowledge of the distance to a reflector. It is expressed as distance over time: d/t. Typical units are ft/sec, m/sec and km/sec. , depending on the type of measurement and the scale of the problem being investigated. The transmission of sound through a medium is defined in terms of a wave. P (compressional) waves have particle motion parallel to the direction of travel. S (shear) waves have particle motion perpendicular to the direction of travel. P waves travel the fastest, and are the most utilized by seismic and well logging applications. S waves travel more slowly, and cannot be directly measured in air and liquids.
