US 2004/0001388 A1Published application

Method of using electrical and acoustic anisotropy measurements for fracture identification

AssigneeBaker Hughes Incorporated

InventorsBerthold Kriegshauser, Otto N. Fanini, Richard A. Mollison, Liming Yu, Tsili Wang, Xiao Ming Tang

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Abstract

Measurements made by a cross-dipole acoustic logging tool in a borehole are processed to determine the principal directions of azimuthal anisotropy of a subsurface formation. Measurements indicative of azimuthal resistivity variations are also made with a multicomponent induction logging tool. These electrical measurements are processed using the principal direction determined from acoustic measurements to give an estimate of azimuthal resistivity variations. Based on modeling results, azimuthal resistivity variations are interpreted to estimate a fracture depth in the rock for known fluids therein.

Claims14

Dependent claims

A method of determining a parameter of interest of a subsurface formation, said subsurface formation including fractures having a fluid therein, the method comprising:

(a) using a cross-dipole acoustic logging tool in a borehole within the formation and making a set of acoustic measurements indicative of the parameter of interest;
(b) processing the acoustic measurements and obtaining an estimate of a principal direction of anisotropy of the subsurface formation relative to an axis of the borehole;
(c) using an electrical logging tool in the borehole for obtaining electrical measurements indicative of the parameter of interest;
(d) defining a model including the principal direction of anisotropy;
and
(e) determining from the electrical measurements the parameter of interest, said determination based at least in part on said model.

3 more elements

Dependencies are inferred from the claim text.