TY - GEN
T1 - Velocity-saturation relation in partially saturated rocks
T2 - 78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
AU - Liu, J. W.
AU - Muller, T. M.
AU - Qi, Q. M.
AU - Lebedev, M.
AU - Sun, W. T.
N1 - Funding Information:
This research was sponsored by the Foundation of State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing (No. PRP/open-1511).
PY - 2016
Y1 - 2016
N2 - The relationship between P-wave velocity and fluid saturation in saturated porous media is of importance for reservoir rock characterization. Forced imbibition experiments in the laboratory reveal rather complicated velocity-saturation relations including rollover-like patterns induced by injection rate changes. Poroelasticity-theory based patchy saturation models with a constant fluid patch size are not enough to describe these velocity-saturation relations. Therefore, we incorporate a saturation-dependent patch size function into two models for patchy saturation. With this, we can model the observed velocitysaturation relations obtained at different injection rates well. The results indicate that there can exist a distinct relation between patch size and injection rate. Moreover, we assess the relative importance of capillarity on velocity-saturation relations and find that capillarity stiffening impairs the impact of patch size changes. Capillarity stiffening appears to be a plausible explanation when a decrease of the injection rate is expected to boost the importance of capillarity.
AB - The relationship between P-wave velocity and fluid saturation in saturated porous media is of importance for reservoir rock characterization. Forced imbibition experiments in the laboratory reveal rather complicated velocity-saturation relations including rollover-like patterns induced by injection rate changes. Poroelasticity-theory based patchy saturation models with a constant fluid patch size are not enough to describe these velocity-saturation relations. Therefore, we incorporate a saturation-dependent patch size function into two models for patchy saturation. With this, we can model the observed velocitysaturation relations obtained at different injection rates well. The results indicate that there can exist a distinct relation between patch size and injection rate. Moreover, we assess the relative importance of capillarity on velocity-saturation relations and find that capillarity stiffening impairs the impact of patch size changes. Capillarity stiffening appears to be a plausible explanation when a decrease of the injection rate is expected to boost the importance of capillarity.
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U2 - 10.3997/2214-4609.201600804
DO - 10.3997/2214-4609.201600804
M3 - Conference contribution
AN - SCOPUS:85085405875
T3 - 78th EAGE Conference and Exhibition 2016: Efficient Use of Technology - Unlocking Potential
BT - 78th EAGE Conference and Exhibition 2016
PB - European Association of Geoscientists and Engineers, EAGE
Y2 - 30 May 2016 through 2 June 2016
ER -