ESR N° 6: Active Fiber-Optic DTS methods to monitor subsurface flow dynamics

Research Fellow: Behzad Pouladi

Profile
Profile

hosted at University of Rennes 1 – CNRS

Supervisors
Olivier Bour
Laurent Longuevergne

Secondments
UniL – 6 months (2019, 2020)
Silixa – 1 month (2019)

Research Objectives

Novel application of Active Fiber-Optic Distributed Temperature Sensing (FO-DTS) for characterization of subsurface media i.e. both fractured and porous media. The data acquired by continuously monitoring the temperature data by using FO-DTS will be inverted to obtain hydraulic tomographies.

Tasks and methodology

  • Adapting these recent developments in various hydraulic conditions (cross-borehole interference tests, periodic hydraulic tests and ambient conditions) to test the possibility of using heat as a groundwater tracer in fractured media.
  • Testing the feasibility of developing an innovative hydraulic tomography approach based on distributed data on flows and temperature changes. The method will be based on active DTS methods thanks to buried cables within saturated porous media to quantify in-situ fluxes during hydraulic tests within sandy aquifers or saline wedges.
  • Employing multiphysics sensing method such as strain sensing will also be investigated for characterizing hydromechanical behaviors of heterogeneous media.

Data & Datasets

Future datasets will be inserted in the H+ database.

Dissemination and communications

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2019

Poster presented during AGU Fall Meeting (San Francisco): “An assessment of the relative information content of ground water flux and pressure data in the context of geostatistical inversion”

June 4th: Oral presentation at 24th H+ Network Meeting: “Real-time flow profiling in fractured wellbores using Distributed Temperature Data: Case study in an inclined fractured wellbore in Guidel site”

Poster presented during the EGU General Assembly 2019: Quantification of the real-time flow contribution of the fractures in the fractured wellbores using Distributed Temperature Data

2018

Poster presented during the 4th Cargèse Summer School 2018: Temperature as a powerful tool in understanding the subsurface process and properties

Glossary

Fiber-Optic Distributed Temperature Sensing: A novel Tool that allows continuous monitoring of the temperature along the fiber-optic cable with high spatial resolution.