Method for determining the pressure or stress of a geological fo

Details Method for determining the pressure or stress of a geological fo Method for determining the pressure or stress of a geological fo

1990-04-05

1992-08-25

Hayes, Gail O.

Boots, shoes, and leggings

73155, E21B 4900

Patent

active

051424711

ABSTRACT:
A method to determine stress, pore pressure, or other properties of a geological formation by measuring acoustic characteristics of the formation. The acoustic characteristics, which may be one or more of the following group of characteristics-compressional acoustic velocity, shear acoustic velocity, compressional acoustic attenuation, and shear acoustic attenuation-depend on the net stress of the formation. The net stress in turn, depends on the pore pressure. Measurements of one or more acoustic characteristics at several depths allows determination of the net stress, which in turn allows determination of the pore pressure and other properties of the formation.

REFERENCES:
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patent: 4557295 (1985-11-01), Holmes
patent: 4797821 (1989-06-01), Petak et al.
patent: 4845982 (1989-07-01), Gilbert
patent: 4860581 (1989-08-01), Zimmerman et al.
Eberhart-Phillips et al., "Empirical Relationships Among Seismic Velocity, Effective Pressure, Porosity, and Clay Content in Sandstone," Geophysics, vol. 54, No. 1 (Jan., 1989), pp. 82-89.
Han et al., "Effects of Porosity and Clay Content on Wave Velocities in Sandstone," Geophysics, vol. 51, No. 11 (Nov., 1986), pp. 2093-2107.
Towle, "Stress Effects on Acoustic Velocities of Rocks," PhD Thesis, Colorado School of Mines (7978), pp. 92-95.

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