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Data results from the East Tennant NDI Borehole Wireline Density Report are now available for review.
Formation density data obtained by wireline logging were validated using laboratory-based bulk density data obtained by the Archimedes method on diamond drill core samples at Geoscience Australia. The validation was conducted to test the reliability of the wireline formation density data to provide users with certainty for application of the data in geophysical models.
Results of the validation show that wireline-logged formation density data and Archimedes wet bulk density data are in good general agreement in the first five boreholes drilled (NDIBK01, NDIBK02, NDIBK03, NDIBK04 and NDIBK05). Difficult drilling and some lost drilling equipment meant that boreholes NDIBK06, NDIBK07 and NDIBK09 could not be cased properly, or could not be re-entered, and thus formation density wireline logs could not be obtained in these holes. Boreholes NDIBK08 and NDIBK10 were wireline logged, however formation density results from these last two holes were problematic. Wireline formation density results for borehole NDIBK08 are shown to be too high. Wireline formation density results from borehole NDIBK10 cannot be robustly assessed because of a lack of sufficient Archimedes bulk density data needed to provide statistical relevance for the validation.