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U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5167

Statistical Stationarity of Sediment Interbed Thicknesses in a Basalt Aquifer, Idaho National Laboratory, Eastern Snake River Plain, Idaho

Prepared in cooperation with the U.S. Department of Energy
DOE/ID-22204

By Caleb N. Stroup, Department of Geosciences, Idaho State University, John A. Welhan, Idaho Geological Survey, and Linda C. Davis, U.S. Geological Survey

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Figures

Figure 1. Map showing location of the study area, major topographic features, and ground-water flow model boundaries within the Idaho National Laboratory, Idaho.

Figure 2. Map showing locations of wells included in this study and in the studies of Anderson and Liszewski (1997) and Welhan and others (2006), in the study area, Idaho National Laboratory, Idaho.

Figure 3. Graph showing thickness and depth to the base of all sedimentary interbeds observed in this study, Idaho National Laboratory, Idaho. Shaded areas indicate the average depth to the base of composite-stratigraphic unit 1 and the maximum depth to the base of composite-stratigraphic unit group 2–7.

Figure 4. Graphs showing frequency distribution of individual sedimentary interbed thicknesses among three groups of composite-stratigraphic units, Idaho National Laboratory, Idaho.

Figure 5. Map showing locations of two geographic groups of coreholes used in tests of spatial stationarity, Idaho National Laboratory, Idaho.

Figure 6. Graphs showing frequency distributions of individual sedimentary interbed thicknesses within composite stratigraphic units 2–7 from two geographic groups of coreholes, Idaho National Laboratory, Idaho.

Figure 7. Graphs showing frequency distributions of individual sedimentary interbed thickness for composite units 2–3, 4–5, and 6–7, Idaho National Laboratory, Idaho.

Figure 8. Graphs showing frequency distributions of individual sedimentary interbed thicknesses among two groups of interbeds from nearby boreholes, from this study and from the study of Anderson and Liszewski (1997), Idaho National Laboratory, Idaho.

Figure 9. Graphs showing frequency distributions of individual sedimentary interbed thicknesses among two groups of interbeds, from this study based only on natural-gamma logs and from the study of Anderson and Liszewski (1997), Idaho National Laboratory, Idaho.

Tables

Table 1. Summary of composite stratigraphic units and time spans as defined by Anderson and Liszewski (1997), Idaho National Laboratory, Idaho.

Table 2. Summary of available lithologic, natural-gamma, and photographic log sources and logged intervals from coreholes used in this study, Idaho National Laboratory, Idaho.

Table 3. List of boreholes with defined composite unit stratigraphy near new coreholes analyzed in this study, Idaho National Laboratory, Idaho.

Table 4. Results of nonparametric tests of similarity of sediment thickness medians, variances, and distribution shapes between two geographic groups of coreholes, Idaho National Laboratory, Idaho.

Table 5. Results of nonparametric tests of similarity of median sediment thicknesses between three composite unit groups, Idaho National Laboratory, Idaho.

Table 6. Results of nonparametric tests of similarity of median sediment thicknesses between various composite unit groups within composite units 2–7, Idaho National Laboratory, Idaho.

Table 7. Boreholes from which stratigraphic information was compiled by Anderson and Liszewski (1997) and compared with information gathered from new coreholes in this study, Idaho National Laboratory, Idaho.

Table 8. Results of nonparametric tests of similarity of sediment thickness medians, variances, and distribution shapes between two independent data sets, Idaho National Laboratory, Idaho.

Table 9. Results of nonparametric tests of similarity of sediment thickness medians, variances, and frequency distribution shapes, Idaho National Laboratory, Idaho.

Table 10. Results of nonparametric tests of similarity of sediment thickness medians, variances, and distribution shapes between two independent data sets interpreted from natural-gamma logs, Idaho National Laboratory, Idaho.

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Send questions or comments about this report to the author, L.C. Davis, (208) 282-4702.

For more information about USGS activities in Idaho, visit the USGS Idaho Water Science Center home page.