首页|Effects of confining pressure and pore pressure on multipole borehole acoustic field in fluid-saturated porous media
Effects of confining pressure and pore pressure on multipole borehole acoustic field in fluid-saturated porous media
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In-situ stress is a common stress in the exploration and development of oil reservoirs.Therefore,it is of great sig-nificance to study the propagation characteristics of borehole acoustic waves in fluid-saturated porous media under stress.Based on the acoustoelastic theory of fluid-saturated porous media,the field equation of fluid-saturated porous media under the conditions of confining pressure and pore pressure and the acoustic field formula of multipole source excitation in open hole are given.The influences of pore pressure and confining pressure on guided waves of multipole borehole acoustic field in fluid-saturated porous media are investigated.The numerical results show that the phase velocity and excitation intensity of guided wave increase significantly under the confining pressure.For a given confining pressure,the phase velocity of the guided wave decreases with pore pressure increasing.The excitation intensity of guided wave increases at low frequency and then decreases at high frequency with pore pressure increasing,except for that of Stoneley wave which decreases in the whole frequency range.These results will help us get an insight into the influences of confining pressure and pore pressure on the acoustic field of multipole source in borehole around fluid-saturated porous media.
confining pressurepore pressurefluid-saturated porous mediamultipole borehole acoustic field
赵志强、刘金霞、刘建宇、崔志文
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College of Physics,Jilin University,Changchun 130012,China
National Natural Science Foundation of ChinaNatural Science Foundation of Jilin Province,China
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