实验室岩心声学速度测试中的频散现象
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摘要
本文主要对实验室岩心测试中由于高频引起的速度频散现象进行研究。研究中主要采用Gassmann方程计算了干岩样盐水饱和后的纵、横波速度,代替地震勘探频率下的纵、横波速度,并与盐水饱和样品的实测速度进行对比,由此估计速度频散的大小。通过对不同地区实例的研究发现:对物性较好的样品,频散现象较小,此时基于岩心测试数据所作的岩石物理研究可以用来指导地震勘探研究;而对物性较差的样品,频散现象较为明显,此时要审慎应用测试的数据。
This paper mainly discusses velocity dispersion due to high frequency in ultrasonic core measurement of laboratory.We adopt Gassmann's equation to calculate V_P and V_S of the brine-saturation core sample,then contrasted them to actual measured ultrasonic velocities of the samples.Therefore the magnitude of velocity dispersion is estimated.Through research of a few examples in 2 areas in South China Sea,we have found the following discoveries: When the properties of reservoir samples are good,the velocity dispersion is small,lab rock physics research results are suggested to be applied in seismic exploration.When the properties of reservoir samples are poor,the velocity dispersion is strong,we should be careful in applying lab core data in seismic exploration.
This paper mainly discusses velocity dispersion due to high frequency in ultrasonic core measurement of laboratory.We adopt Gassmann's equation to calculate V_P and V_S of the brine-saturation core sample,then contrasted them to actual measured ultrasonic velocities of the samples.Therefore the magnitude of velocity dispersion is estimated.Through research of a few examples in 2 areas in South China Sea,we have found the following discoveries: When the properties of reservoir samples are good,the velocity dispersion is small,lab rock physics research results are suggested to be applied in seismic exploration.When the properties of reservoir samples are poor,the velocity dispersion is strong,we should be careful in applying lab core data in seismic exploration.
引文
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[2]Han De-hua et al.Effects of porosity and clay contenton wave velocities in sandstones.Geophysics,1986,51(11):2093～2107
[3]王炳章等.多孔介质的流体机制模型及其频散机理.勘探地球物理进展,2008,31(6):405～413Wang Bing-zhang et al.Fluid mechanism models andtheir velocity dispersions in porous media.Progress inExploration Geophysics,2008,31(6):405～413
[4]邓继新等.储层砂岩纵波衰减的实验结果分析.石油物探,2008,47(4),346～351Deng Ji-xin et al.Experimental analysis of P-wave at-tenuation in sandstone of reservoir with ultrasonic fre-quency.GPP,2008,47(4):346～351
[5]He Tao et al.Laboratory study of fluid viscosity in-duced ultrasonic velocity dispersion in reservoir sand-stones.Applied Geophysics,2010,7(2):114～126
[6]Winkler K W.Estimates of velocity dispersion be-tween seismic and ultrasonic frequencies.Geophysics,1986,51(1):183～189
[7]Wang Z.Fundamentals of seismic rock physics.Geo-physics,2001,66(2):398～412
[8]Batzle M and Wang Z.Seismic properties of pore flu-ids.Geophysics,1992,57(11):1396～1408
[9]任科英等.莺琼盆地高温高压地层岩石地球物理特征和模型正演研究.广东湛江:中海石油(中国)有限公司湛江分公司,内部研究报告,2009
[2]Han De-hua et al.Effects of porosity and clay contenton wave velocities in sandstones.Geophysics,1986,51(11):2093～2107
[3]王炳章等.多孔介质的流体机制模型及其频散机理.勘探地球物理进展,2008,31(6):405～413Wang Bing-zhang et al.Fluid mechanism models andtheir velocity dispersions in porous media.Progress inExploration Geophysics,2008,31(6):405～413
[4]邓继新等.储层砂岩纵波衰减的实验结果分析.石油物探,2008,47(4),346～351Deng Ji-xin et al.Experimental analysis of P-wave at-tenuation in sandstone of reservoir with ultrasonic fre-quency.GPP,2008,47(4):346～351
[5]He Tao et al.Laboratory study of fluid viscosity in-duced ultrasonic velocity dispersion in reservoir sand-stones.Applied Geophysics,2010,7(2):114～126
[6]Winkler K W.Estimates of velocity dispersion be-tween seismic and ultrasonic frequencies.Geophysics,1986,51(1):183～189
[7]Wang Z.Fundamentals of seismic rock physics.Geo-physics,2001,66(2):398～412
[8]Batzle M and Wang Z.Seismic properties of pore flu-ids.Geophysics,1992,57(11):1396～1408
[9]任科英等.莺琼盆地高温高压地层岩石地球物理特征和模型正演研究.广东湛江:中海石油(中国)有限公司湛江分公司,内部研究报告,2009
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