Technical questions : to Koichi Hayashi OYO Corporation () Tsukuba Technical Research and Development Center, Engineering Geophysics R&D Dept.
#Downhole seisimager install
For Windows NT : Install then install Start from from within the at first, to your PC. Installation For Windows 2000 : Install For Windows95&98 : Install at first, then install of the CD. Layered model Layered model PlotRefa Tutorial 1 Final result5 PickWin95 PlotRefaTime-term method Reciprocal methodĬhecking traveltime curves Initial model Tomographic analysis Automatic correction Smooth model : analysis with borehole and tunnel data, modeling (model generation, raytracing). Tomographic nalysis : generating initial model, inversion based on non-linear least square method, conversion into layerd model. Automatic correction for layered model : non-linear least square method, correction for layer thickness, correction for layer velocity. Comparison of observed and calculated traveltimes Raytracing : based on Huygens principle, comparison of observed and calculated data, raypaths view. Reciprocal method : layer assignment, reduced traveltime curves, delay time calculation, delay time view, generating velocity model. Time-term method : linear least square method for two-layer velocity model. Seismic Refraction Analysis with SeisImager/2DSeismic refraction analysis : PlotRefaMaximum data : source 200 * receiver 1000 * layer 50 Traveltime checking : traveltime correction with a mouse, traveltime difference curve, Raytracing based on Huygens principle automatic correction for reciprocal traveltime. : Show traveltime curves on waveform data Waveform view : wiggle/variable view, normalize, clipping. Wave processing : power spectrum, band pass filter, stacking, notch filter, velocity filter, correlation.
#Downhole seisimager manual
Picking first arrival : automatic picking, manual picking with a mouse. Seismic Refraction Analysis with SeisImager/2DPicking first arrival : PickWin95Waveform data : SEG2, OYO McSEIS-170 170f SX,SX-48ch. It can handle surface data as well as the data obtained from sources and receivers in boreholes or tunnels. 3:Tomographic analysis The tomographic analysis can image velocity model almost automatically. Sometimes, it is called GRM, or Hagiwaras method. The timeterm method is a simple linear least square method for two-layer velocity model 2:Reciprocal method (Hagiwaras method) If the number of layers is larger than three, you can use reciprocal method. 1:Time-term method If the velocity model is a simple horizontal two-layer model, you can use the time-term method. Following analysis approach can be used in the PlotRefa.
#Downhole seisimager software
Plotrefa is a software for seismic refraction analysis. PickWin95 is a software for picking first arrival. It consits of two-software, named PickWin95 and PlotRefa. SeisImager/2D is the two-dimensional seismic refraction analysis software. Seismic Refraction Analysis with SeisImager/2D PickWin95 (Picking first arrival) PlotRefa(Seismic refraction analysis) OYO CorporationTsukuba Technical Research and Development Center Engineering Geophysics R&D Dept.1
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