立陡状金属矿随机介质地震正演模拟研究
|
摘要
地震勘探对于陡倾角地层探测效果通常不好,但有很多金属矿成高陡或立陡产状。金属矿成层性不好,岩性变化大,矿体内部具有一定的随机特征。针对这个特点,建立一个垂直和水平构造的矿体模型,在均匀介质模型的基础上加入随机参数形成随机介质模型。经过对方差大小的试验,发现当矿体方差远大于围岩方差时,矿体的反射和绕射非常明显。所以在符合这种条件时,可以开展立陡状金属矿地震勘探试验。
The seismic exploration effect is usually bad for the detection of steep formation, but many metal ores are steep slope attitude. The deposit strata is not layered, lithology changes largely, and the inner of orebody appears some random characteristics. For this feature, we set up a vertical and horizontal structure of the orebody model, based on the homogeneous medium model by adding random parameters. After many experiments of the variance, it is discovered that the orebody's reflection and diffraction are obvious when the variance of orebody is much larger than the surrounding's. We can carry out some seismic exploration tests of the steep slope attitude metal ore which meets such conditions.
The seismic exploration effect is usually bad for the detection of steep formation, but many metal ores are steep slope attitude. The deposit strata is not layered, lithology changes largely, and the inner of orebody appears some random characteristics. For this feature, we set up a vertical and horizontal structure of the orebody model, based on the homogeneous medium model by adding random parameters. After many experiments of the variance, it is discovered that the orebody's reflection and diffraction are obvious when the variance of orebody is much larger than the surrounding's. We can carry out some seismic exploration tests of the steep slope attitude metal ore which meets such conditions.
引文
[1]PRETORIUS C C,JAMISON A A,IRONS C.Seismicexploration in the Witwatersrand basin[J].Republic ofSouth Africa,1987,3(87):241.
[2]BERND MILKEREIT,DAVID EATON,WU J.,et al.Seismic imaging of massive sulfide deposits;Part II,Reflection seismic profiling[J].Economic Geology,Aug,1996,91:829.
[3]SALISBURY M H,MILKEREIT B,BLEEKER W.Seismic imaging of massive sulfide deposits:Part I.rock properies[J].Economic Geology,1996,91(5):821.
[4]IKELE L T,YUNG S K.2-D random media with el-lipsoidal autocorrelation functions[J].Geophysics,1993,58(9):1359.
[5]奚先,姚姚.二维随机介质及波动方程正演模拟[J].石油地球物理勘探,2001,36(5):546.
[6]奚先,姚姚.随机介质模型的模拟与混合型随机介质[J].地球科学—中国地质大学学报,2002,27(1):67.
[7]姚姚,奚先.随机介质模型正演模拟及其地震波场分析[J].石油物探,2002,41(1):31.
[8]奚先,姚姚,二维弹性随机介质中的波场特征[J].石油地球物理勘探,2004,39(6):679.
[9]奚先,姚姚.非平稳随机介质模型[J].石油地球物理勘探,2005 40(1):71.
[2]BERND MILKEREIT,DAVID EATON,WU J.,et al.Seismic imaging of massive sulfide deposits;Part II,Reflection seismic profiling[J].Economic Geology,Aug,1996,91:829.
[3]SALISBURY M H,MILKEREIT B,BLEEKER W.Seismic imaging of massive sulfide deposits:Part I.rock properies[J].Economic Geology,1996,91(5):821.
[4]IKELE L T,YUNG S K.2-D random media with el-lipsoidal autocorrelation functions[J].Geophysics,1993,58(9):1359.
[5]奚先,姚姚.二维随机介质及波动方程正演模拟[J].石油地球物理勘探,2001,36(5):546.
[6]奚先,姚姚.随机介质模型的模拟与混合型随机介质[J].地球科学—中国地质大学学报,2002,27(1):67.
[7]姚姚,奚先.随机介质模型正演模拟及其地震波场分析[J].石油物探,2002,41(1):31.
[8]奚先,姚姚,二维弹性随机介质中的波场特征[J].石油地球物理勘探,2004,39(6):679.
[9]奚先,姚姚.非平稳随机介质模型[J].石油地球物理勘探,2005 40(1):71.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心