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Porus rock3/30/2024 Laboratory bulk volume test results ( Fatt, 1959) on the Boise sandstone show that Biot's coefficient values range from 1 (very low differential pressure of 0.5 MPa), 0.82 (differential pressure of 20 MPa) to 0.77 (high differential pressure of 60 MPa). Experimental results also show that Biot's coefficient values decrease as the differential pressure (the confining pressure minus pore pressure) increases. Biot's coefficients from laboratory tests in different rocks show that Biot's coefficient is a function of porosity ( Cosenza et al., 2002). Few oedometric experiments on shales and marls indicate that Biot's coefficients are around 0.7 ( Burrus, 1998). Biot's coefficients in shales are poorly documented. From triaxial compression tests in the middle Bakken rocks, Biot's coefficients are 0.6–0.79 for sandstones, 0.62–0.75 for dolomites, and 0.69–0.83 for limestones ( Wang and Zeng, 2011). Laboratory measurements demonstrate that for underground rocks Biot's coefficient values decrease with porosity from a value of 1 at surface conditions to values around 0.6–0.8 at porosity of 0.15–0.20 for carbonates and sandstones ( Bouteca and Sarda, 1995). For unconsolidated or high porosity rocks, Biot's coefficient is close to 1. The upper limit of Biot's coefficient is 1.
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