一次中尺度波速测量结果
IN-SITU VELOCITY MEASUREMENTS
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摘要: 1982年底在吉林油田的一组深约400m的井孔中作了一次中尺度声波测量,指出岩层P波的波速表现出明显的各向异性.根据现场地质情况,对岩心的观察及渗透性的各向异性指出,波速的各向异性主要是断层和具有优势取向的宏观裂纹引起的,而裂纹的取向与构造应力场是有关的.Abstract: In-situ velocity measurements which were carried out at a set of wells about 400 meters deep in the Jilin provincial oil field in 1982 indicate that anisotropy of P-wave velocity is distinct. Based on in-situ geological study in the field, analysis of rock samples and the anisotropy of permeability of cores, it is pointed out that the anisotro-py of P-wave velocity is mainly caused by faults and directional of cracks; and the orientation of cracks is correspondent with the stress state in the Song Liao basin.
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[1] Nur,A., G. Simmons,水饱和对低孔隙率岩石速度的影响,地震理论与实验译文集,115——124地震出版社,1979.
[2] Hadly, K, Azimuthal variation of dilatancy, J. Geophys. Res., 80, 4845一4350, 1975.
[3] Nur. A, G. Simmons, Stress——induced velocity anisotropy in rock: an experimental study, J, Gtophys.Res., 74, 6667——6672, 1969,
[4] Crampin. S., E. M. Chesonkov, R, C. Hipkin, Seismic anisotropy一一the state of art II, Geophys,J. R. astr. Soc., 76, 1——16, 1984,
[5] Hudson, J. A., Wave speeds and attenuation of elastie waves in material containing cracks, Gcophys,J. R. aser. Soc., 64, 133——150, 1981.
[6] 汪素云、许忠淮,中国东部大陆的地震构造应力场,地震学报,7,17——31,1985.[1] Nur,A., G. Simmons,水饱和对低孔隙率岩石速度的影响,地震理论与实验译文集,115——124地震出版社,1979.
[2] Hadly, K, Azimuthal variation of dilatancy, J. Geophys. Res., 80, 4845一4350, 1975.
[3] Nur. A, G. Simmons, Stress——induced velocity anisotropy in rock: an experimental study, J, Gtophys.Res., 74, 6667——6672, 1969,
[4] Crampin. S., E. M. Chesonkov, R, C. Hipkin, Seismic anisotropy一一the state of art II, Geophys,J. R. astr. Soc., 76, 1——16, 1984,
[5] Hudson, J. A., Wave speeds and attenuation of elastie waves in material containing cracks, Gcophys,J. R. aser. Soc., 64, 133——150, 1981.
[6] 汪素云、许忠淮,中国东部大陆的地震构造应力场,地震学报,7,17——31,1985.
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