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Assessing the resolution-dependent utility of tomograms for geostatistics

January 1, 2004

Geophysical tomograms are used increasingly as auxiliary data for geostatistical modeling of aquifer and reservoir properties. The correlation between tomographic estimates and hydrogeologic properties is commonly based on laboratory measurements, co-located measurements at boreholes, or petrophysical models. The inferred correlation is assumed uniform throughout the interwell region; however, tomographic resolution varies spatially due to acquisition geometry, regularization, data error, and the physics underlying the geophysical measurements. Blurring and inversion artifacts are expected in regions traversed by few or only low-angle raypaths. In the context of radar traveltime tomography, we derive analytical models for (1) the variance of tomographic estimates, (2) the spatially variable correlation with a hydrologic parameter of interest, and (3) the spatial covariance of tomographic estimates. Synthetic examples demonstrate that tomograms of qualitative value may have limited utility for geostatistics; moreover, the imprint of regularization may preclude inference of meaningful spatial statistics from tomograms.

Citation Information

Publication Year 2004
Title Assessing the resolution-dependent utility of tomograms for geostatistics
DOI 10.1029/2004GL019617
Authors F. D. Day-Lewis, J.W. Lane
Publication Type Article
Publication Subtype Journal Article
Series Title Geophysical Research Letters
Index ID 70027250
Record Source USGS Publications Warehouse
USGS Organization Office of Ground Water; Toxic Substances Hydrology Program

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