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微测井和小折射是低、降速带测量的常规方法,实际施工中,视地表条件按一定的间隔进行测量。在低、降速带较稳定的前提下,这种方法能得到可靠的低、降速层的物性参数,作为分层内插的控制点。控制点间的低、降速层的参数由控制点延拓。若表层结构较简单,且横向速度差异不大的情况下,能得到较好的结果;而当表层速度和厚度变化大且低、降速带的底界又起伏较大时,不但不能获得准确的地表延迟时,消除低高频静校正的影响,而且还会产生新的长波长静校正。用FOCUS系统中的剩余静校正处理系统,能够提高地震资料品质,概述了FOCUS系统几种静校正方法的使用前提和条件,通过实例说明了应用这些静校正方法所取得的良好效果。
Micro-logging and small refraction are common methods for measuring low-velocity belts. In actual construction, surface conditions are measured at regular intervals. Under the precondition that the stability of low speed and deceleration zone is stable, this method can obtain the reliable physical property parameters of low and deceleration layers as the control points of the hierarchical interpolation. Control points between the low, deceleration layer parameters from the control point extension. If the surface structure is simple, and the lateral velocity difference is not big case, get better results; and when the surface velocity and thickness changes and low, the bottom of the deceleration zone and ups and downs, not only can not get accurate Of the surface delay, eliminating the effects of low-frequency static correction, but also produce a new long-wavelength static correction. The residual static correction system in FOCUS system can improve the quality of seismic data. The preconditions and conditions of several static correction methods in FOCUS system are summarized. The good effects of applying these static correction methods are illustrated by examples.