Earth:Mudrock line
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Revision as of 16:42, 19 April 2022 by imported>Rtexter1 (fixing)
In rock physics and petrophysics, the mudrock line, also called Castagna's equation or Castagna's relation, is an empirical linear relation between seismic P-wave velocity and S-wave velocity in brine-saturated siliciclastic rocks (i.e. sandstones and shales). The equation reads:
- [math]\displaystyle{ V_p = 1.16 V_s + 1.36 }[/math]
Where [math]\displaystyle{ V_p }[/math] and [math]\displaystyle{ V_s }[/math] refer to P-wave velocity and S-wave velocity, respectively.[1] Velocities are given in kilometers per second (km/s).
The name of the equation refers to John Castagna, professor of exploration geophysics at the University of Houston,[2] who discovered the relation while working for ARCO, an oil company that is now a subsidiary of Marathon Petroleum.
References
- ↑ Castagna, J. P.; Batzle, M. L.; Eastwood, R. L. (1985). "Relationships between compressional-wave and shear-wave velocities in clastic silicate rocks". Geophysics 50 (4): 571–581. doi:10.1190/1.1441933. Bibcode: 1985Geop...50..571C.
- ↑ http://www.geosc.uh.edu/people/faculty/john-castagna/index.php "University of Houston directory"
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