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Fluid pressure heterogeneity during fluid flow in rocks: New laboratory measurement device and method

Brantut, N; Aben, FM; (2021) Fluid pressure heterogeneity during fluid flow in rocks: New laboratory measurement device and method. Geophysical Journal International , 225 (2) pp. 968-983. 10.1093/gji/ggab019. Green open access

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Abstract

We present a new type of transducer capable of measuring local pore fluid pressure in jacketed rock samples under elevated confining pressure conditions. The transducers are passive (strain-gauge based), of small size (7 mm in diameter at the contact with the rock and around 10 mm in length), and have minimal dead volume (a few mm3). The transducers measure the differential pressure between the confining fluid and the internal pore pressure. The design is easily adaptable to tune the sensitivity and working pressure range up to several hundred megapascals. An array of four such transducers was tested during hydrostatic pressurization cycles on Darley Dale sandstone and Westerly granite. The prototypes show very good linearity up to 80 MPa with maximum deviations of the order of 0.25 MPa, regardless of the combination of pore and confining pressure. Multiple internal pore pressure measurements allow us to quantify the local decrease in permeability associated with faulting in Darley Dale sandstone, and also prove useful in tracking the development of pore pressure fronts during transient flow in low permeability Westerly granite.

Type: Article
Title: Fluid pressure heterogeneity during fluid flow in rocks: New laboratory measurement device and method
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/gji/ggab019
Publisher version: http://dx.doi.org/10.1093/gji/ggab019
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: Permeability and porosity, Geomechanics, Hydrogeophysics
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10125410
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