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| In [[rock physics]] and [[petrophysics]], the '''mudrock line''', also called '''Castagna's equation''' or '''Castagna's relation''', is an [[Empirical research|empirical]] linear relation between [[seismology|seismic]] [[P-wave]] velocity and [[S-wave]] velocity in [[brine]]-saturated siliciclastic rocks (i.e. [[sandstone]]s and [[shale]]s).
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| The equation reads:
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| :<math>V_p = 1.16 V_s + 1.36</math>
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| Where <math>V_p</math> and <math>V_s</math> refer to P-wave velocity and S-wave velocity, respectively.<ref>{{cite journal |first1=J. P. |last1=Castagna |first2=M. L. |last2=Batzle |first3=R. L. |last3=Eastwood |title=Relationships between compressional-wave and shear-wave velocities in clastic silicate rocks |journal=Geophysics |year=1985 |volume=50 |pages=571–581}}</ref> Velocities are given in kilometers per second (km/s).
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| The name of the equation refers to [[John Castagna]], professor of [[exploration geophysics]] at the [[University of Houston]],<ref>http://www.geosc.uh.edu/people/faculty/john-castagna/index.php "University of Houston directory"</ref> who discovered the relation while working for [[ARCO]], an oil company that is now a subsidiary of [[BP]].
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| ==References==
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| {{Reflist}}
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| [[Category:Geophysics]]
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| [[Category:Well logging]]
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Revision as of 18:24, 19 February 2014
Hi there! :) My name is Angeles, I'm a student studying Modern Languages from Tytherington, United Kingdom.
Look at my page help me do my essay