TY - JOUR
T1 - The study of heterogeneous two-phase flow around small-scale heterogeneity in porous sandstone by measured elastic wave velocities and lattice Boltzmann method simulation
AU - Kitamura, Keigo
AU - Jiang, Fei
AU - Valocchi, Albert J.
AU - Chiyonobu, Shun
AU - Tsuji, Takeshi
AU - Christensen, Kenneth T.
N1 - Publisher Copyright:
© 2014. American Geophysical Union. All Rights Reserved.
PY - 2014/10
Y1 - 2014/10
N2 - Two-phase fluid flow is strongly controlled by small-scale (subcore-scale) heterogeneity of porous sandstone. We monitor the heterogeneous/anisotropic two-phase flow (CO2 and water) in porous sandstone and conduct multichannel VP and VP anisotropy measurements under super critical CO2 conditions during CO2 injection (drainage) and water reinjection (imbibition) processes. In drainage, VP shows large reduction (~10%) in all sections of the core sample and changes from the bottominlet side to upper outlet side. It is considered that VP reduction reflects the CO2 movement in the specimen. The VP anisotropy of the upper two planes indicates clear increase. The results of this experiment indicate the heterogeneous CO2 flow around laminae in porous sandstone and characteristic behavior of these laminae as a barrier for CO2. On the other hand, flow of water is not affected by this barrier. This characteristic CO2 water flow around laminae is observed in the numerical simulation results. This simulation study also indicates that the capillary number is not directly affected on two-phase fluid flow around small-scale heterogeneity in porous sandstone. These results suggest that the small-scale heterogeneity behaves as a CO2 gate and strongly controls CO2 behavior in porous sandstone.
AB - Two-phase fluid flow is strongly controlled by small-scale (subcore-scale) heterogeneity of porous sandstone. We monitor the heterogeneous/anisotropic two-phase flow (CO2 and water) in porous sandstone and conduct multichannel VP and VP anisotropy measurements under super critical CO2 conditions during CO2 injection (drainage) and water reinjection (imbibition) processes. In drainage, VP shows large reduction (~10%) in all sections of the core sample and changes from the bottominlet side to upper outlet side. It is considered that VP reduction reflects the CO2 movement in the specimen. The VP anisotropy of the upper two planes indicates clear increase. The results of this experiment indicate the heterogeneous CO2 flow around laminae in porous sandstone and characteristic behavior of these laminae as a barrier for CO2. On the other hand, flow of water is not affected by this barrier. This characteristic CO2 water flow around laminae is observed in the numerical simulation results. This simulation study also indicates that the capillary number is not directly affected on two-phase fluid flow around small-scale heterogeneity in porous sandstone. These results suggest that the small-scale heterogeneity behaves as a CO2 gate and strongly controls CO2 behavior in porous sandstone.
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U2 - 10.1002/2014JB011281
DO - 10.1002/2014JB011281
M3 - Article
AN - SCOPUS:84915755896
VL - 119
SP - 7564
EP - 7577
JO - Journal of Geophysical Research
JF - Journal of Geophysical Research
SN - 0148-0227
IS - 10
ER -