| http://www.w3.org/ns/prov#value | - This interval transit time may then be used in the Wyllie time-average equation, ??t=??tsolid (1-??)+??tfluid (??) , to obtain porosity ??. ??tsolid and ??tfluid are known from predetermined knowledge of the speed of propagation of sound in various rocks and fluids and by knowing the types of rock and fluid in which the investigation is being made.
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