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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: : Where and refer to P-wave velocity and S-wave velocity, respectively. 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,〔http://www.geosc.uh.edu/people/faculty/john-castagna/index.php "University of Houston directory"〕 who discovered the relation while working for ARCO, an oil company that is now a subsidiary of BP. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mudrock line」の詳細全文を読む スポンサード リンク
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