Application of optical‐fiber temperature logging—An example in a sedimentary environment

Förster, Andrea; Schrötter, Jörg; Merriam, Daniel F.; Blackwell, David

doi:10.1190/1.1444211

Cited by 44 publications

(25 citation statements)

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“…The DTS unit is coupled with an optical-fiber cable (the distributed sensor) to a wireline on surface whereas recording direction is from bottom-up. The recording interval was 1 m. According to the manufacturer the DTS system allows temperature measurements with a resolution of plus or minus 0.1 degree C and an absolute temperature precision of about 0.3 degree C. For details of the principle of measurement the reader is referred to Hurtig et al 1994 andFörster et al, 1997. The gradient plot in the AIG10 borehole shows remarkable differences in the temperature gradient.…”

Section: V33 Dts Temperature Logging and Heat Flow Determinationmentioning

confidence: 99%

“…The DTS principle differs completely from the conventional temperature logging techniques. In contrast to conventional logging where temperatures are obtained sequentially, perhaps during a time period of hours, the DTS data reflect instantaneous temperatures at the selected depth interval along the fiber length (depth) in the borehole (Förster et al, 1997).…”

Section: V33 Dts Temperature Logging and Heat Flow Determinationmentioning

confidence: 99%

“…In AIG10 the Distributed optical fibre Temperature Sensing technique (DTS) was used which has been introduced within the recent years as a new technology for the measurement of temperature in boreholes (e.g. Hurtig et al, 1993;Förster et al, 1997). The DTS technique is based on the Optical Time Domain Reflection concept (OTDR).…”

Section: V33 Dts Temperature Logging and Heat Flow Determinationmentioning

confidence: 99%

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Thermo-hydraulic conditions in a seismically active zone (Gulf of Corinth, Greece)

Rettenmaier¹,

Forste²,

Hötzl³

2008

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PrefaceIn this thesis the thermo-hydraulic conditions of a seismically active zone have been investigated by means of surface and subsurface investigations, borehole studies and numerical modeling. European research activities in the Gulf of Corinth have been targeted for obtaining data on earthquake sources and fault mechanics and for investigating the role of faults on fluid flow in this seismically active area. In this context, the DFG funded a project aimed at the exploration of the thermo-hydraulic conditions in the area near Aigion and the southern graben shoulder of the northern Peloponnesus including the determination of surface heat flow in a 1000 m deep borehole, which is the scope of this work.First, due to a lack of geological information, a detailed investigation of the geological and tectonical situation was made. Secondly, the hydraulic parameters of the different lithological formations and of the hydraulic behavior of normal faults were determined.Based on the field studies, hydraulic testing, petrophysical well-log analysis, optical-fiber temperature sensing, and laboratory measurement of thermal conductivity, a hydrogeological conceptual model was prepared. This conceptual model formed the basis for a numerical 2-D model of the hydraulic conditions at regional scale at the southern Corinth graben shoulder. Different simulation scenarios were investigated to search for the best-fit model to known parameters.Coupled numerical modeling of groundwater flow and heat transport was then used to get insights in the processes that may be typical for the study area. In the case of the Corinth area, model calibration, as well as sensitivity and plausibility checks allow a prediction on how the thermo-hydraulic system in this seismically active zone is characterized and how the hydraulic conditions affect the heat flow. Surface heat-flow density was unknown in the northern Peloponnesus prior this study. Also unknown was whether the water flow in aquifers results in strong heat advection signals in the temperature field.The coupling of temperature and geothermal parameters to the calibrated hydraulic flow model has shown that some of the intervals are affected by heat advection due to fluid flow, affecting the temperature gradient and hence the heat flow. In a pure conduction heat regime the measured temperature of 32°C from 750 m depth would be increase to 37°C. At the lower model boundary of 1155 m depth the maximal temperature in the conductive 1-D temperature profile is 45°C which is approximately 4.5°C higher than in the coupled thermo-hydraulic flow model. The examination of coupled modeling runs has shown that conductive heat flow of the crust is about 55 mW/m². Finally, it is clear that the quality of input data is playing a major role for the best fitting of a numerical model. Otherwise it was also shown that sometimes generalization is necessary when general restrictions from the modeling software are required. Undoubtedly, the fault zones of the Gulf of Corinth are representing one case...

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Section: V33 Dts Temperature Logging and Heat Flow Determinationmentioning

confidence: 99%

Section: V33 Dts Temperature Logging and Heat Flow Determinationmentioning

confidence: 99%

Section: V33 Dts Temperature Logging and Heat Flow Determinationmentioning

confidence: 99%

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Thermo-hydraulic conditions in a seismically active zone (Gulf of Corinth, Greece)

Rettenmaier¹,

Forste²,

Hötzl³

2008

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“…The effects of radiative heating on fiberoptic cables used to monitor water temperatures have also been evaluated (Neilson et al, 2010;Suárez et al, 2011). Early DTS work in hydrogeology was focused on thermal monitoring of geothermal wells and boreholes (Hurtig et al, 1994;Förster et al, 1997). Then, DTS systems were used to analyze the dynamic subsurface thermo-hydraulic conditions in aquifers (Macfarlane et al, 2002).…”

Section: Other Applications Of Fiber-optic Distributed Temperature Sementioning

confidence: 99%

“…The use of fiber-optic DTS in the environment began during the 1990s (Hurtig et al, 1994;Förster et al, 1997) when temperature in boreholes was monitored with resolutions of ±0.1 °C. In the middle of the 2000s, DTS systems achieved acceptable levels of spatial and temporal resolution, along with high temperature accuracy and resolution to monitor the environment.…”

Section: Use Of Fiber-optic Distributed Temperature Sensing In the Enmentioning

confidence: 99%

Heat Transfer in the Environment: Development and Use of Fiber-Optic Distributed Temperature Sensing

Suárez¹,

Hausner²,

Dozier³

et al. 2011

Developments in Heat Transfer

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An active heat tracer experiment to determine groundwater velocities using fiber optic cables installed with direct push equipment

Bakker

Caljé²,

Schaars³

et al. 2015

Water Resources Research

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A new approach is developed to insert fiber optic cables vertically into the ground with direct push equipment. Groundwater temperatures may be measured along the cables with high spatial and temporal resolution using a Distributed Temperature Sensing system. The cables may be inserted up to depths of tens of meters in unconsolidated sedimentary aquifers. The main advantages of the method are that the cables are in direct contact with the aquifer material, the disturbance of the aquifer is minor, and no borehole is needed. This cost-effective approach may be applied to both passive and active heat tracer experiments. An active heat tracer experiment was conducted to estimate horizontal groundwater velocities in a managed aquifer recharge system in the Netherlands. Six fiber optic cables and a separate heating cable were inserted with a 1 m spacing at the surface. The heating cable was turned on for 4 days and temperatures were measured during both heating and cooling of the aquifer. Temperature measurements at the heating cable alone were used to estimate the magnitude of the groundwater velocity and the thermal conductivity of the solids. The direction of the velocity and heat capacity of the solids were estimated by including temperature measurements at the other fiber optic cables in the analysis. The latter analysis suffered from the fact that the cables were not inserted exactly vertical. The three-dimensional position of the fiber optic cables must be measured for future active heat tracer experiments.

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Application of optical‐fiber temperature logging—An example in a sedimentary environment

Cited by 44 publications

References 0 publications

Thermo-hydraulic conditions in a seismically active zone (Gulf of Corinth, Greece)

Thermo-hydraulic conditions in a seismically active zone (Gulf of Corinth, Greece)

Heat Transfer in the Environment: Development and Use of Fiber-Optic Distributed Temperature Sensing

An active heat tracer experiment to determine groundwater velocities using fiber optic cables installed with direct push equipment

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