Kriging方法在初至层析静校正中的应用
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摘要
西部地区地震勘探工作多是在山地、山前带、沙漠、沟壑纵深区等低降速带变化大的复杂地区进行,静校正问题成为制约勘探成效的瓶颈问题。如果在数据采集时,考虑到地学断面空间结构横向上存在的相关性,引入地质统计学的克里格(Kriging)方法估计整个区域内的静校正值,根据静校正值估计分布图合理布置炮点与接收点的位置,从而可以获得静校正量变化更加平稳的数据,提高地震初至波的分辨率,最终得到高质量的地震剖面。根据这一思路,编制了初至层析克立格静校正软件。
Since seismic exploration in the northwestward area is mainly carried out in mountainous region,foothill belt,gobi and desert,where the variation of low velocity layer is rapid,so static correction has become a bottleneck restricting the effect of exploration.Considering the horizontal coherency of spatial structures in physiographic fractured surfaces,the Kriging method of geostatistics was introduced to correct the whole region static correction.According the distributing of the static correction value,we can reasonable arrangement the position of the shot and receiver,which will improved the resolution of the first arrival wave,alleviated the rise and fall or vary irregularly of the static correction value.
Since seismic exploration in the northwestward area is mainly carried out in mountainous region,foothill belt,gobi and desert,where the variation of low velocity layer is rapid,so static correction has become a bottleneck restricting the effect of exploration.Considering the horizontal coherency of spatial structures in physiographic fractured surfaces,the Kriging method of geostatistics was introduced to correct the whole region static correction.According the distributing of the static correction value,we can reasonable arrangement the position of the shot and receiver,which will improved the resolution of the first arrival wave,alleviated the rise and fall or vary irregularly of the static correction value.
引文
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[2]王靖波,潘懋,张绪定.基于Kriging方法的空间散乱点插值[J].计算机辅助设计与图形学学报,525(5)
[3]包世泰,廖衍旋,胡月明,等.基于Kriging的地形高程插值[J].地理与地理信息科学,28(5)
[4]王银宏,彭润民,翟裕生.基于Windows克立格算法的可视化编程与应用[J].地质与勘探,88(4)
[5]申立中,刘先荣,刘宗亮.西部地区静校正方法研究[J].内蒙古石油化工,2005,60(2)
[6]李德华,程怡,沈骥千,等.初至层析静校正在复杂山地三维地震勘探中的应用[J].中国煤炭地质,44(3)
[7]吴杰,苏勤,王建华.层析静校正技术在柴北缘地区的应用[J].岩性油气藏,79(4)
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