1、 CPS/SEG Beijing 2009 International Geophysical Conference Allen B, 1980; Liming Wang, Qingchun Li, 2006; Hongxun Pan and Wubao Fang, 2008). There are velocity analysis modules in enterprise software such as Vista, most of which can only be used to do velocity analysis on PP data. They are limited b
2、y software package, and cannot be planted. They are not easy to be operated, so the operators must have more professional knowledge and be trained on the software. And most of those are developed to process seismic reflection data in oil exploring, without the function of velocity analysis on conver
3、ted wave. This paper develops an interactive velocity analysis module on the basis of being used easily, being operated flexibly and being planted conveniently. It is an open module which can be planted in other software. It is mainly designed to be used to do velocity analysis on PP and PSV data in
4、 shallow and well and tunnel seismic geologic conditions with high frequency and high resolution. The module does velocity analysis by the use of theory on velocity analysis with selected-correlation method (Liming Wang, Qingchun Li, 2006). We realize interactive velocity analysis by combining graph
5、ic user interface (GUI) provided by C# and strong algorithmic function provided by Fortran. It improves efficiency and accuracy of velocity analysis by setting parameters and reading stacking velocity files repeatedly and interactive dialog with user. THEORY AND TECHNIQUE Interactive velocity analys
6、is module mainly includes spectrum and real-time gather. Meanwhile, the routine of selected-correlation method is embedded in the software. We pick up velocity by the way of constant velocity scan, and then judge whether information picked up such as velocity ,time and gather number is correct accor
7、ding to real-time gather. Finally, the datum picked up are exported in a stacking velocity file . Velocity spectrum Spectrum in general includes stacking velocity spectrum K, correlation spectrum A and semblance spectrum cS , and the corresponding expressions are as follows(Deji Huang, Zhenhua He, J
8、ishan Bao, 1990): =+=+=+=+=+=MjNirjijrjijrjiMjNirjijrjiliiiiifffffVtK012,M02N1i,cM02N1i,012,M02N1i,0(3) /)(S (2) )(A(1) )(),(where irjif+,is sample at trace number i and time j+ri,ri is time window, M is sample points, N is total traces. In this module, another method of velocity spectrum with high accuracy, selective- correlation method, is used. It calculates value of energy according to selected-correlation-sum approach (given in Formula 4)( Valmore Celis and Ken Larner, 2002): Main Menu ID: 1197 CPS/SEG Beijing 2009 International Geophysical Conference . 9 m . : , 2004
