高速屏蔽层下煤层反射波能量正演模拟
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摘要
根据Snell定理和Zoeppritz方程,采用数值模拟方法进行了6层水平介质模型的正演模拟,研究了反射地震波能量与入射角的关系,煤层反射振幅随入射角的变化情况,发现地震反射波能量在入射角接近临界角处突然增强。基于该规律,采用大炮检距接收屏蔽层下的能量可有效地削弱屏蔽层的影响,达到提高屏蔽层下反射波能量的目的。
Based on the Snell theorem and Zoeppritz equation,to use the numerical simulation carried out forward modeling for 6 layered horizontal medium models.Studied the relation between reflection wave energy and incident angle,coal seam reflection amplitude changing along with incident angles,have found that seismic reflection energy buildup abruptly when incident angle is close to the critical angle.Based on this regulation,to use longer geophone offset to receive energy below the shielding layer can weaken shielding impact and gain the point to enhance reflection wave energy.
Based on the Snell theorem and Zoeppritz equation,to use the numerical simulation carried out forward modeling for 6 layered horizontal medium models.Studied the relation between reflection wave energy and incident angle,coal seam reflection amplitude changing along with incident angles,have found that seismic reflection energy buildup abruptly when incident angle is close to the critical angle.Based on this regulation,to use longer geophone offset to receive energy below the shielding layer can weaken shielding impact and gain the point to enhance reflection wave energy.
引文
[1]李可恩,熊晓军,杨俊.高速屏蔽层下地震数据的采集[J].天然气地球科学,2006,17(4):527-531.
[2]陆基孟.地震勘探原理[M].东营:石油大学出版社,1993:14-15.
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[4]王志,贺振华,黄德济,等.高速屏蔽层下弱反射层地震勘探[J].勘探地球物理进展,2002,25(5):23-27.
[5]董守华,马彦良,周明.煤层厚度与振幅、频率地震属性的正演模拟[J].中国矿业大学学报,2004,33(1):29-32.
[6]Dong S H,Yun J H.Forward modeling of the relationship between reflection coefficient and incident angle of the P-wave in a coal seam[J].Journal of China University of Mining&Technology(English Edition),2006,(1):5-7.
[7]Zhang J G,Dong S H,Yun J H.Forward modeling of azimuthal anisotropy to the reflected P-wave of coal seam[J].Journal of China University of Mining&Technology(English Edition),2006,(3):321-324.
[8]Liu Y,Wei X C.Fracture detection using the travel time of 3-Dreflected compressional wave[J].Oil Geophysical Prospecting,1999,34(6):607-613.
[9]Fruehn J,White R S,Fliedner M,et al.Large-aperture seismic:Imaging beneath high-velocity strata[J].World oil,1999,220(1):109～113.
[10]Brittan J,Warner M.Wide-angle seismic velocities in heterogeneous crust[J].Geophysics Journal International,1997,129(2):269～280.
[11]Zillmer M,Gajewski D,Kashtan B M.Reflection coefficients for weak anisotropic media[J].Geophysics Journal International,1997,129(2):389～398.
[2]陆基孟.地震勘探原理[M].东营:石油大学出版社,1993:14-15.
[3]董守华.地震资料煤层横向预测与评价方法[M].徐州:中国矿业大学出版社,2004:46-47.
[4]王志,贺振华,黄德济,等.高速屏蔽层下弱反射层地震勘探[J].勘探地球物理进展,2002,25(5):23-27.
[5]董守华,马彦良,周明.煤层厚度与振幅、频率地震属性的正演模拟[J].中国矿业大学学报,2004,33(1):29-32.
[6]Dong S H,Yun J H.Forward modeling of the relationship between reflection coefficient and incident angle of the P-wave in a coal seam[J].Journal of China University of Mining&Technology(English Edition),2006,(1):5-7.
[7]Zhang J G,Dong S H,Yun J H.Forward modeling of azimuthal anisotropy to the reflected P-wave of coal seam[J].Journal of China University of Mining&Technology(English Edition),2006,(3):321-324.
[8]Liu Y,Wei X C.Fracture detection using the travel time of 3-Dreflected compressional wave[J].Oil Geophysical Prospecting,1999,34(6):607-613.
[9]Fruehn J,White R S,Fliedner M,et al.Large-aperture seismic:Imaging beneath high-velocity strata[J].World oil,1999,220(1):109～113.
[10]Brittan J,Warner M.Wide-angle seismic velocities in heterogeneous crust[J].Geophysics Journal International,1997,129(2):269～280.
[11]Zillmer M,Gajewski D,Kashtan B M.Reflection coefficients for weak anisotropic media[J].Geophysics Journal International,1997,129(2):389～398.
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