煤层Love型槽波数值模拟及其频散特征分析
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摘要
槽波地震是探查采煤工作面内部小断层或其他地质异常中的有效手段,但以往对槽波中蕴含的频散信息利用不足。采用二维高阶交错网格法模拟了煤层槽波的波场发育特征,激发震源采用横波震源,模型边界吸收采用完全匹配层法。从模拟结果可以看出:与传统槽波理论认识不同,槽波的能量不仅分布在基阶模式,高阶部分的能量也很强,这对于今后的煤矿井下槽波勘探具有一定的参考意义。
In-Seam Seismic(ISS) is effective means to detect the small faults or other geological anomalies within the coal mining face,but the dispersive information in the channel waves could not be fully utilized in the previous application.The 2D high order staggered network method was applied to simulate the development features of the seam channel wave field.The horizontal wave seismic source was applied to the excitation sources.The Perfectly Matched Layer(PML) method was applied to the boundary absorption of the model.The simulation results showed that in comparison with the different understanding to the traditional channel wave theory,the channel wave energy could distribute in the basic model and the energy of the high order part would be also high and could provide the certain references to the underground mine channel wave exploration in the future.
In-Seam Seismic(ISS) is effective means to detect the small faults or other geological anomalies within the coal mining face,but the dispersive information in the channel waves could not be fully utilized in the previous application.The 2D high order staggered network method was applied to simulate the development features of the seam channel wave field.The horizontal wave seismic source was applied to the excitation sources.The Perfectly Matched Layer(PML) method was applied to the boundary absorption of the model.The simulation results showed that in comparison with the different understanding to the traditional channel wave theory,the channel wave energy could distribute in the basic model and the energy of the high order part would be also high and could provide the certain references to the underground mine channel wave exploration in the future.
引文
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[14]Berenger J P.A Perfectly Matched Layer for the Absorption ofElectromagnetic Waves[J].Journal Computation Physics,1994,114:185-200.
[2]刘天放,潘冬明,李德春,等.槽波地震勘探[M].徐州:中国矿业出版社,1994.
[3]Evison F F.A Coal Seam as a Guide for Seismic Energy[J].Nature,1955,176:1224-1225.
[4]Krey T C.Channel Waves as a Tool of Applied Geophysics inCoal Mining[J].Geophysics,1962,28:701-714.
[5]潘冬明,刘天放.拉夫型榜波的有限差分合成[J].中国煤田地质,1990,2(2):54-59.
[6]裴正林,董玉珊,彭苏萍.裂隙煤层弹性波场方位各向异性特征数值模拟研究[J].石油地球物理勘探,2007,42(6):665-672.
[7]Greenhaigf S A,King D W.Dispersive Characteristic of Love-type Channel Waves in Australian Coal Seams[J].Bull AustSoc Explore Geophys,1981,12(1/2):5-9.
[8]董良国,马在田,曹景忠,等.一阶弹性波方程交错网格高阶差分解法[J].地球物理学报,2000,43(3):411-419.
[9]牟永光,裴正林.三维复杂介质地震数值模拟[M].北京:石油工业出版社,2005.
[10]董良国,马在田,曹景忠.一阶弹性波方程交错网格高阶差分解法稳定性研究[J].地球物理学报,2000,43(6):856-864.
[11]裴正林.三维各向异性介质中弹性波方程交错网格高阶有限差分法模拟[J].石油大学学报:自然科学版,2004,28(5):23-29.
[12]Oprsal I,Zahradnik J.Elastic Finite-Difference Method for Ir-regular Grids[J].Geophysics,1999,64(1):240-250.
[13]Nordstorm J,Carpenter M H.High-Order Finite DifferenceMethods,Multidimensional Linear Problems and Curvilinear Co-ordinates[J].J Comput Phys,2001,173(1):149-174.
[14]Berenger J P.A Perfectly Matched Layer for the Absorption ofElectromagnetic Waves[J].Journal Computation Physics,1994,114:185-200.
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