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US 6,553,314 B2Granted
Method for determination of apparent resistivities of anisotropic reservoirs
AssigneeBaker Hughes Incorporated
InventorsBerthold F. Kriegshauser, Otto N. Fanini, Pravin Gupta, Liming Yu
Life of this patent
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Abstract
Shoulder corrections are applied to measurements obtained from a multi-component electromagnetic logging tool. An anisotropic resistivity model is obtained using the shoulder corrected data. The process is iterated until a good match is obtained between the shoulder corrected data and the model output.
Claims13
A method of determining a parameter of interest of subsurface formations surrounding a borehole, the method comprising:
- (a) conveying an electromagnetic logging tool into the borehole and using at least one electromagnetic transmitter and one electromagnetic receiver on the tool to obtain measurements related to a horizontal and vertical resistivity of the formation;
- (b) obtaining a plurality of layer intervals for the subsurface;
- (c) deriving a horizontal and vertical resistivity at a plurality of depths from said measurements using an anisotropic whole space model;
- (d) obtaining from the derived horizontal and vertical resistivities a layered model;
- (e) deriving shoulder bed corrections based upon the layered model and the whole space model;
- and
- (f) determining from said whole space model and said shoulder bed corrections an updated layered model.
4 more elements
Dependencies are inferred from the claim text.