Formation Evaluation by Inspection With the Borehole Televiewer

Zemanek, Joseph; Glenn, E.E.; Norton, L.J.; Caldwell, Richard L.

doi:10.1190/1.1440089

Cited by 226 publications

(103 citation statements)

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“…The principle of borehole televiewer measurements has been described by Zemanek et al (1970) and is only briefly summarized here. The borehole televiewer is an acoustic transducer which emits 2 MHz pulses at a rate of 1800/sec.…”

Section: Borehole Televiewer Studies -Methodsmentioning

confidence: 99%

Report on televiewer log and stress measurements in core hole USW G-2, Nevada Test Site, October-November, 1982

Stock¹,

Healy²,

Hickman³

1984

Open-File Report

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Section: Borehole Televiewer Studies -Methodsmentioning

confidence: 99%

Report on televiewer log and stress measurements in core hole USW G-2, Nevada Test Site, October-November, 1982

Stock¹,

Healy²,

Hickman³

1984

Open-File Report

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“…The first approach consists in lowering a borehole televiewer (Zemanek et al, 1970) into the boreholes to obtain high-resolution, continuous images with 360 • Coverage of the local geology and fracturing. A borehole televiewer is composed of a transducer which is rotated 360 • while lowered down inside the borehole.…”

Section: Borehole Loggingmentioning

confidence: 99%

Heterogeneous bedrock investigation for a closed-loop geothermal system: A case study

et al. 2016

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a b s t r a c tThis paper investigates bedrock heterogeneity by applying three different geophysical approaches, in order to study the long-term behaviour and the interaction between closed-loop geothermal systems. The investigated site consists of four boreholes equipped with geothermal pipes on the campus of University of Liege, Belgium. The first approach includes acoustic borehole imaging, gamma-ray logging and cuttings observation and results to a detailed fracture characterisation, rock identification and layer dip angle determination. The second approach consists of measuring the thermal conductivity of cuttings at the laboratory. Study of cuttings thermal conductivity measurements can contribute to bedrock heterogeneity knowledge concerning the transition of one formation to another and the layer dipping. The third approach is based on high-resolution temperature profiles, measured during the hardening of the grouting material and the recovery phase of a Distributed Thermal Response Test. Through this approach a correlation of the temperature profiles to the geological characteristics of the surrounding bedrock is identified. The analysis of this correlation can provide information on fractured zones, alternation of different rock types and layering dipping. This latter approach can be easily applied on closed-loop geothermal systems to characterise the bedrock and investigate its heterogeneity as well as contribute to the their long-term behaviour prediction and to the optimisation of their efficiency.

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“…The BHTV (DMT) is a borehole acoustic logging tool in which an ultrasonic pulse is emitted by a rotating transducer and reflected from the borehole wall [Zemanek et al, 1970]. It uses a single piezo- With the FMS-4 pads version used in this study, about 50% of the borehole wall was imaged to obtain an oriented picture of the borehole wall by mapping its electrical conductivity, using an array of small, pad-mounted electrodes [Ekstrom et al, 1986;Luthi and Banavar, 1988].…”

Section: Data Analysis Cores and Borehole Imagesmentioning

confidence: 99%

Comparative analysis of direct (core) and indirect (borehole imaging tools) collection of fracture data in the Hot Dry Rock Soultz reservoir (France)

Genter¹,

Castaing²,

Dezayes³

et al. 1997

J. Geophys. Res.

109

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Abstract. Attributes of several thousand fractures were collected in three boreholes of 2.2, 3.6, and 3.8 km depth, penetrating the Soultz Hot Dry Rock reservoir (France). The fractures were sampled from cores and from several high-resolution imaging techniques such as borehole televiewer (BHTV), ultrasonic borehole imager (UBI), formation microscanner (FMS), formation microimager (FMI), and azimuthal resistivity imaging (ARI). A comparison was made between the data collected on cores and those provided by different imaging techniques. The comparison clearly establishes that the different wall-images are not as exhaustive as the core data and cannot provide a complete characterization of the fracture network. Discrete fractures thinner than 1 mm are not properly detected. This is also the case for discrete fractures closer than 5 mm, which appear only as single traces. The imaging techniques are, nevertheless, very powerful for characterizing altered fracture clusters. Whatever the technique used, the fracture strikes were correctly sampled with the different systems. This comparison allowed us to calibrate the fracture population data obtained from the imaging system in order to correct for the filtering effect introduced by the technique itself and by the alteration of the rock mass.

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Formation Evaluation by Inspection With the Borehole Televiewer

Cited by 226 publications

References 0 publications

Report on televiewer log and stress measurements in core hole USW G-2, Nevada Test Site, October-November, 1982

Report on televiewer log and stress measurements in core hole USW G-2, Nevada Test Site, October-November, 1982

Heterogeneous bedrock investigation for a closed-loop geothermal system: A case study

Comparative analysis of direct (core) and indirect (borehole imaging tools) collection of fracture data in the Hot Dry Rock Soultz reservoir (France)

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