摘要
随着大排列地震勘探的发展,2次项NMO动校正技术已不能满足大排列的动校正精度要求,但高阶方程的求解具有参数复杂、计算量大的问题。本文在分析Tariq方程的基础上,根据Tsvankin等人提出的方法,介绍一种计算速度快、方程参数简明的时距曲线表达式——NMO校正6次项优化方程。由于该方程展开截断误差比泰勒6次项小,因此精度更高。通过理论记录和地震数据测试结果表明,采用优化6次项方程对大排列地震数据进行NMO校正的效果比泰勒6次项好,可使地震同相轴在不同炮检距处更具相关性,避免了混波现象,改善了叠加剖面的分辨率和连续性。
Along with development of scismic explo-ration by longer spread , the NMO corrcction by second order term doesn't meet the needs of NMO precision of longer spread, but high-order equa-tions face with the problems that have complicated parameter and large computational efforts. On thc basis of analyzing Tariq equation and according to the method presented by Tsvankin et al,the paper introduced time-distance curvc expression-NMO correction equation with optimized sixth-order term, which has rapid computational speed and simplified equation parameters. Because of smaller truncation errors of expansion equation than sixth-order term of its Taylor series,so it has higher pre-cision. The results from synthetic records and seismic data show that adopting the equation with optimized sixth-order term has better effects than that of sixth-order Taylor series in NMO correction for seismic data with longer spread,which has good correlation for seismic events of different off-sets,avoiding smear and making stack section have higher resolution and continuity.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2003年第6期603-607,共5页
Oil Geophysical Prospecting
关键词
地震勘探
优化
地震波
NMO校正方法
地震数据处理
seismic data,processing,longer spread, NMO correction with sixth-order term, truncation error
