Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1996-01-22
1997-10-07
Porta, David P.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250261, 364422, G01V 504
Patent
active
056751478
ABSTRACT:
A system and method for evaluating a geological formation is described which compares actual wireline log measurements from a number of wireline logging tools to predicted tool response logs. The system and method uses a forward model of each tool response, given a formation description, to predict a set of wireline logs. Comparing the predicted logs with the actual measured logs yields a mismatch error. The system and method iteratively adjusts the formation description to minimize the mismatch error to obtain a "best" formation description. In one form, the formation description includes petrophysical properties (porosity, density, saturation) and geometry properties (dip, bedding, invasion). In a more complicated form, the formation description also includes a model of petrophysical mixing laws and formation material content. In the special case of a horizontally layered formation and linear tool response models, there exists a computationally efficient version of the system and method.
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Q.-H. Liu, Nonlinear Inversion of Electrode-Type Resistivity Measurements, Schlumberger-Doll Research Note Report #ISD-006-93-48, Jun. 25, 1993, published at IEEE Transactions on Geoscience and Remote Sensing, vol. 32, No. 3, pp. 499-507, May 1994.
Arikan Orhan
Ekstrom Michael P.
Rossi David J.
Bruce David Vernon
Huston Charles D.
Maseles Danita J. M.
Porta David P.
Schlumberger Technology Corporation
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