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Mudrock Line
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: :V_p = 1.16 V_s + 1.36 Where V_p and V_s 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 Marathon Petroleum Marathon Petroleum Corporation is an American petroleum refining, marketing, and transportation company headquartered in Findlay, Ohio. The company was a wholly owned subsidiary of Marathon Oil until a corporate spin-off in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rock Physics
Petrophysics (from the Greek πέτρα, ''petra'', "rock" and φύσις, ''physis'', "nature") is the study of physical and chemical rock properties and their interactions with fluids. A major application of petrophysics is in studying reservoirs for the hydrocarbon industry. Petrophysicists are employed to help reservoir engineers and geoscientists understand the rock properties of the reservoir, particularly how pores in the subsurface are interconnected, controlling the accumulation and migration of hydrocarbons. Some of the key properties studied in petrophysics are lithology, porosity, water saturation, permeability and density. A key aspect of petrophysics is measuring and evaluating these rock properties by acquiring well log measurements – in which a string of measurement tools are inserted in the borehole, core measurements – in which rock samples are retrieved from subsurface, and seismic measurements. These studies are then combined with geological and geophys ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |