摘要
地震时间剖面的数字偏移程序不但要有较好的偏移效果,还要求运算速度快,否则其应用要受到限制.为提高基于几何地震学的二维射线偏移效果,除要求原始资料质量高、测线垂直走向外,还需选择合适的偏移方法,采用相应的速度坐标形式、有准确的偏移速度和较准确地计算偏移范用.这样就能较准确地截取反射时距曲线与绕射时距曲线切点附近的能量进行叠加.实线证明这种偏移具有讯噪比高、无偏移弧噪声和运算速度高等特点.
Abstract
For the digital migration program of time section, it is required not only the better results but also the high speed of calculation, or its application will surely be restricted. In order to produce a better effect of 2-D rays migration based on geometric seismology, besides the high quality raw data and the parallel-with-inclination line, a suitable choice of migrating method, an adoption of corresponding form of velocity coordinate, the accurate migration velocity and the accurate calculation of the limit of migration are required. Thus, it would be possible to taper the energy near the point of tangency of reflection T-X curve and diffraction T-X curve for stack. It has been proved that this method of migration has a lot of merits- high signal to noise ratio, no arc noise of migration and the high speed of calculation.
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