Method for determining in-situ formation properties

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73152, G01V 128

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048315303

ABSTRACT:
A method for determining in-situ formation properties is provided. Through regression analyses, empirical systematic relations are obtained using measures of formation properties obtained form formation samples of at lest one reference well over a range of effective pressures and pore fluids. The formation properties are selected from the group comprising shear velocity, compressional velocity, as well as porosity and mineralogy content. Direct measurements of at least two in-situ formation properties selected from the group of shear velocity, compressional velocity, porosity and mineralogy content are obtained for an exploratory well. The empirical systematic relations of formation properties are inverted to determine estimates of the balance of the insitu formation properties selected from the group including shear wave velocity, compressional wave velocity, porosity and mineralogy content not directly measured.

REFERENCES:
patent: 4584874 (1986-04-01), Ruhovets
patent: 4692910 (1987-09-01), Sondergeld et al.
patent: 4722220 (1988-02-01), Herron
Han, D. et al. "Effects of Porosity and clay content on wave velocities in sandstones", Geophysics, vol. 51, No. 11, Nov. 1986, 2093-2107.
Castagna, et al., "Relationships Between Compressional Wave and Shear-Wave Velocities in Clastic Silicate Rocks", Geophysics, vol. 50, No. 4, pp. 571-581.

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