دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: English system buttress thread whose top angle is 29°. Mainly used to convey dynamic.

formations below the deepest zones that can be imaged by an acoustic process.

the velocity of an imposed sound wave (acoustic velocity) through a rock times the density of the rock.

n: a record of the measurement of porosity, done by comparing depth to the time it takes for a sonic impulse to travel through a given length of formation. The rate of travel of the sound wave through a rock depends on the composition of the formation and the fluids it contains. Because the type of formation can be ascertained by other logs, and because sonic transit time varies with relative amounts of rock and fluid, porosity can usually be determined in this way.

n: A display of traveltime of acoustic waves versus depth in a well. The term is commonly used as a synonym for a sonic log. Some acoustic logs display velocity.

a sonic travel time record of a formation using a tool with an emitter and a detector. Measures porosity and is useful to compare to other porosity longs to estimate pore filling. Also used to generate rock strength evaluations.