--> Application of Petroleum Geophysical Logging Techniques for Evaluating Water Quality, by M. G. Waddell and T. J. Temples; #90986 (1994).

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Abstract: Application of Petroleum Geophysical Logging Techniques for Evaluating Water Quality

Michael G. Waddell, Tom J. Temples

The Hilton Head island Test Well #1 was drilled to a depth of 3833 ft to evaluate the upper Eocene-Cretaceous section as a groundwater source for Hilton Head Island. The initial plan was to analyze continuous conventional cores from the top of the Eocene to the base of the Cretaceous (approximately 3500 ft). However, due to excessive cost, it was decided to evaluate the aquifers using geophysical logs with sidewall cores for calibration.

The logging suite consisted of a dual induction resistivity, spontaneous potential, compensated neutron, densilog, gamma ray, spectral gamma, multiple array acoustilog, caliper, high resolution diplog, and a circumferential borehole imaging log (CBIL). In addition to the wireline logs, 239 sidewall cores (SWC) and twelve Formation Multi-test (FMT) samples were obtained.

This information was integrated into an interpretative package using computer analysis and simple spread sheets to calculate aquifer properties, i.e., porosity, hydraulic conductivity, and transmissivity. This integrated analysis was used to select screen zones for completion. Data indicated water quality was above expectations. The information obtained from the logging, SWC, and FMT program allowed decisions to be made about the potential of the well without the expense of conventional coring, flow testing, and completion of the well.

AAPG Search and Discovery Article #90986©1994 AAPG Annual Convention, Denver, Colorado, June 12-15, 1994