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The AAPG/Datapages Combined Publications Database
CSPG Bulletin
Abstract
Formation Porosity and Fluid Content from Velocity Logs
ABSTRACT
A velocity log may be interpreted to advantage by considering it as a formation elasticity log. Load, lithology, porosity and fluid content are discussed in relation to formation elasticity.
An empirical relationship between velocity and porosity has been determined for a limestone and a method is shown whereby porosity, expressed as a percentage, may be read directly from a velocity log.
The detection of hydrocarbons is facilitated by comparing the velocity values of a formation with its resistivity. In general, low velocity accompanied by high resistivity indicates the presence of hydrocarbons. The velocity contrast between oil, gas and water sands is such that fluid contacts may often be located.
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