Integrating geophysical and hydrochemical borehole-log measurements to characterize the Chalk aquifer, Berkshire, United Kingdom

Schurch, Marc; Buckley, David. 2002 Integrating geophysical and hydrochemical borehole-log measurements to characterize the Chalk aquifer, Berkshire, United Kingdom. Hydrogeology Journal, 10 (6). 610-627. 10.1007/s10040-002-0220-x

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Abstract/Summary

Geophysical and hydrochemical borehole-logging techniques were integrated to characterize hydraulic and hydrogeochemical properties of the Chalk aquifer at boreholes in Berkshire, UK. The down-hole measurements were made to locate fissures in the chalk, their spatial extent between boreholes, and to determine the groundwater chemical quality of the water-bearing layers. The geophysical borehole logging methods used were caliper, focused resistivity, induction resistivity, gamma ray, fluid temperature, fluid electrical conductivity, impeller and heat-pulse flowmeter, together with borehole wall optical-imaging. A multiparameter data transmitter was used to measure groundwater temperature, electrical conductivity, dissolved oxygen, pH, and redox potential of the borehole fluid down-hole. High permeability developed at the Chalk Rock by groundwater circulation provides the major flow horizon at the Banterwick Barn study site and represents a conduit system that serves as an effective local hydraulic connection between the boreholes. The Chalk Rock includes several lithified solution-ridden layers, hardgrounds, which imply a gap in sedimentation possibly representing an unconformity. Lower groundwater temperature, high dissolved-oxygen content, and flowmeter evidence of preferential groundwater flow in the Chalk Rock indicated rapid groundwater circulation along this horizon. By repeating the logging at different times of the year under changing hydraulic conditions, other water-inflow horizons within the Chalk aquifer were recognized.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1007/s10040-002-0220-x
Programmes:	BGS Programmes > Groundwater Management
ISSN:	14312174
Additional Keywords:	GroundwaterBGS, Groundwater, Aquifer characterisation, Major aquifer
Related URLs:	http://www.bgs.ac.uk/research/groundwate...
Date made live:	23 Nov 2010 16:15 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/12308

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