有效压力对岩石纵横波速度的影响
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摘要
在济阳坳陷下第三系地层采集了不同岩性的51块典型岩心样品。在不同有效压力情况下测试了岩石的超声波纵横波速度,分析了有效压力对岩石速度的影响。实验结果表明,岩石速度随着有效压力的增加呈非线性增加,在低压力段增加较快,在高压段增加缓慢。通过对实测数据的分析,提出了定量表述这种速度对有效压力的依赖关系,可用于速度压力校正、压力趋势分析,时移地震监测分析和AVO分析。
The ultrasonic compressional and shear wave velocities in rock were measured under different effective pressure conditions in laboratory on 56 samples of four different lithologies from the Tertiary formation in Jiyang Sag. The effect of different effective pressures on compressional and shear wave velocities were analyzed. The experimental results show that rock velocity increases nonlinearly with effective pressure. The velocity increases faster in the range of low pressure than in that of high pressure. Based on the analysis of experiment data, a quantitative dependency of velocity on effective pressure was put forward, which can be used to velocity pressure correction, pressure trend analysis, 4-D seismic monitoring, and AVO a nalysis.
The ultrasonic compressional and shear wave velocities in rock were measured under different effective pressure conditions in laboratory on 56 samples of four different lithologies from the Tertiary formation in Jiyang Sag. The effect of different effective pressures on compressional and shear wave velocities were analyzed. The experimental results show that rock velocity increases nonlinearly with effective pressure. The velocity increases faster in the range of low pressure than in that of high pressure. Based on the analysis of experiment data, a quantitative dependency of velocity on effective pressure was put forward, which can be used to velocity pressure correction, pressure trend analysis, 4-D seismic monitoring, and AVO a nalysis.
引文
1 Wang Zhijing. Fundamentals of seismic rock physics [J]. Geophysics, 2001,66(2):398-412
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3 King M S. Wave velocities in rocks as a function of changes in overburden pressure and pore fluid saturants [J]. Geophysics,1966,31(1): 50-73
4沈联蒂,史訶．岩性、含油气性、有效覆盖压力对纵横波 速度的影响[J]．地球物理学报,1994,37(3):391-398
5韩文功,李红梅,杨云岭等．济阳坳陷岩心弹性和物性参 数的实验室测量及分析[J]．石油物探,1997,36(1): 21-27
6史耨,沈联蒂．根据波速-压力关系评价岩石岩性、物性 的实验研究[J]．地球物理学报,1990,33(2):21-29
7 Faust L. Velocity function including lithologic variation [J]. Geophysics,1953,18(2): 271-287
2 Wyllie M R J, Gregory A R, Gardner G H F. An experimental investigation of factors affecting elastic wave velocities in porous media[J]. Geophysics, 1958, 23(3): 459-493
3 King M S. Wave velocities in rocks as a function of changes in overburden pressure and pore fluid saturants [J]. Geophysics,1966,31(1): 50-73
4沈联蒂,史訶．岩性、含油气性、有效覆盖压力对纵横波 速度的影响[J]．地球物理学报,1994,37(3):391-398
5韩文功,李红梅,杨云岭等．济阳坳陷岩心弹性和物性参 数的实验室测量及分析[J]．石油物探,1997,36(1): 21-27
6史耨,沈联蒂．根据波速-压力关系评价岩石岩性、物性 的实验研究[J]．地球物理学报,1990,33(2):21-29
7 Faust L. Velocity function including lithologic variation [J]. Geophysics,1953,18(2): 271-287
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