Porosity and engineering parameters of thermally degraded Westerly granite

0578252 - GLÚ 2024 RIV US eng C - Konferenční příspěvek (zahraniční konf.)
Lokajíček, Tomáš - Aminzadeh, Ali - Petružálek, Matěj - Řimnáčová, Daniela - Přikryl, R.
Porosity and engineering parameters of thermally degraded Westerly granite.
57th U.S. Rock Mechanics/Geomechanics Symposium. Proceeding papers. Atlanta, Georgia: American Rock Mechanics Association, 2023, č. článku 2023-0378. ISBN 978-0-9794975-8-2.
[U.S. Rock Mechanics/Geomechanics Symposium /57./. Atlanta, Georgia (US), 25.06.2023-28.06.2023]
Grant CEP: GA ČR(CZ) GA21-26542S
Institucionální podpora: RVO:67985831 ; RVO:67985891
Klíčová slova: upstream oil & gas * rock type * geological subdiscipline * united states government * reservoir geomechanics * specimen * pore size distribution * geology * igneous rock * dependence
Obor OECD: Geology; Environmental and geological engineering, geotechnics (USMH-B)
https://onepetro.org/ARMAUSRMS/proceedings-abstract/ARMA23/All-ARMA23/532395

We present a textural analysis study based on the combination of ultrasonic testing (UT) and mercury intrusion porosimetry (MIP) of 36 Westerly granite (WG) samples exposed to different heating temperatures in the range between 100°C and 800°C. Specimens subjected to elevated temperature treatment were also subjected to the thin section analysis. Identical WG cylindrical specimens with diameter 11.5 and height 15 mm were used for UT and MIP study. UT of all specimens was made by P and S wave 1 MHz resonant frequency sensors. It was found that P-S wave velocity, amplitude, frequency and elastic modulus decrease more than 60% as a result of thermal rock material disintegration due to the increased temperature treatment. The damage parameters based on measured values were also determined. MIP showed that the pore size distributions vary with different heating temperature in dependence of the thermal WG treatment. The higher rising porosity values were observed for samples with heating temperature > 500°C. The influence of thermal treatment to the 3D – velocity distribution of P, S1, S2 by UT of spherical sample of 50 mm in diameter was also studied, that enables us to calculate full stiffness tensor. Based on the knowledge of stiffness tensor of WG material heated up to 800°C and loaded to hydrostatic pressure up to 120 MPa the 3D distribution of dynamic engineering parameters like Young and shear modulus and Poisson ratio were determined. Fundamental dynamic engineering parameters for material primary directions in temperature range 100 – 800°C and pressure range 0.1 to 120 MPa were determined.
Trvalý link: https://hdl.handle.net/11104/0347331