An experimental investigation of the role of pore fluids on the nonlinear hysteretic behavior of Berea sandstone

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:542922

Tutuncu, A N; Sharma, M M; Podio, A L ^[1]

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1. Univ. of Texas, Austin, TX (United States)

Uniaxial stress cycling experiments were conducted on dry, brine saturated and hexadecane saturated Berea sandstone samples to observe the hysteresis in stress-strain diagrams and to understand the influence of different fluids on the strain amplitude dependence of elastic moduli and attenuation. Cycling experiments were also conducted with sandstone samples saturated with CTAB, a cationic surfactant that renders the mineral surfaces hydrophobic. Hexadecane and CTAB was selected to investigate the relative contributions of adhesion hysteresis and stick-slip sliding on attenuation in sedimentary granular rocks. Young`s moduli and Poisson`s ratios obtained from the cycling tests show a significant dependence on strain amplitude on dry as well as water and hexadecane saturated samples. Bow-tie shaped diagrams are obtained when loading and unloading tangent moduli are plotted against strain. The type of fluid in the pore space and at the grain contacts has a large influence on the rock stiffness and hysteresis observed in the stress-strain diagrams but very little effect on the magnitude of attenuation.

• OSTI ID: 542922
• Report Number(s): CONF-951013--
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
58 GEOSCIENCES
BRINES
FLUID FLOW
HYSTERESIS
MATERIALS TESTING
POROUS MATERIALS
ROCK MECHANICS
SANDSTONES
SEDIMENTARY ROCKS