Determination of bedrock hydraulic conductivity and hydrochemistry using a wellbore fluid logging method
Conference
·
OSTI ID:10165257
- GZA GeoEnvironmental, Inc., Newton Upper Falls, MA (United States)
- Lawrence Berkeley Lab., CA (United States)
One of the most challenging tasks faced by environmental engineers is cost effective hydraulic and hydrochemical characterization of a fractured bedrock aquifer by means of exploratory wellbores. To address this problem, a new borehole fluid logging method for rapidly and efficiently determining the vertical distribution of hydraulic conductivity in fractured bedrock aquifers has been developed. This new technique was recently applied near two active landfills in southern New England. The technique involves replacing the standing column of water in a borehole with a uniformly deionized fluid, and then profiling the changes in fluid electrical conductivity in the borehole. These changes occur when the contrasting formation water is drawn back into the borehole by continuous low flow rate pumping or by slug testing. A downhole wireline water-quality tool, which simultaneously measures fluid electrical conducivity, temperature, pH and oxidation-reduction potential (Eh), was employed to profile the physical/chemical changes of the ``emplaced`` fluid. The numerical code BORE, was employed to determine the inflow parameters and fracture-specific fluid electrical conducivity for the hydraulically conductive fractures. Straddle packer testing at 10-foot intervals was conducted to confirm the slug testing results. Some discrepancies were encountered which can be explained by accounting for the volume of formation affected by each method. Based on the data presented herein, this new borehole technique can determine the fracture specific inflow parameters (hydraulic conductivity as a function of depth) and estimate hydrochemical parameters (fluid electrical conductivity, temperature, pH and Eh) for the associated formation water flowing through fractured bedrock aquifers.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 10165257
- Report Number(s):
- LBL--30713; CONF-9005149--8; ON: DE92017111
- Country of Publication:
- United States
- Language:
- English
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