Three-dimensional mise-a-la-masse modeling applied to mapping fracture zones
A numerical scheme applying the method of integral equations has been developed for borehole-to-borehole and borehole-to-surface modeling of the apparent resistivity response of a thin conductive body in a half-space; the inhomogeneity simulates a fracture zone. The algorithm is applicable for the direct-current case when the buried electrode is either inside (mise-a-la-masse) or outside (near-miss) the body. In implementing the scheme, the integral equation is transformed into a matrix equation as a result of discretizing the inhomogeneity into rectangular subcells. All properties are assumed to be constant within each subcell. The rectangular subcells are used throughout execution of the algorithm. The computed surface and subsurface apparent resistivity responses are examined for similar bodies with different orientations: (1) vertical, (2) horizontal, (3) dipping at 60 degrees, and (4) dipping at 30 degrees. The different bodies produce apparent resisitivity cross-section plots which differ little from each other with the exception of orientation. 21 refs., 38 figs.
- Research Organization:
- Utah Univ., Salt Lake City (USA). Dept. of Geology and Geophysics; Utah Univ. Research Inst., Salt Lake City (USA). Earth Sciences Lab.
- DOE Contract Number:
- AC03-84SF12196
- OSTI ID:
- 5115895
- Report Number(s):
- DOE/SAN/12196-3; ESL-143; ON: DE86002007
- Country of Publication:
- United States
- Language:
- English
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