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Manual of Kirchhoff depth migration on GPU by overlapping ray tracing and imaging kernel Contents 1.Introduction .......................................................................................................................... 2 2.Computer operation system and hardware........................................................................ 2 3. How to compile the code ..................................................................................................... 2 4. Parameters introduction ..................................................................................................... 3 5. Run the examples................................................................................................................. 6 1 1.Introduction This code is designed to run the Kirchhoff depth migration on GPU, in that the ray tracing and imaging kernel can be ran overlapped to save more time, you can download this code and use it after a little adjustment to computer environment. 2.Computer operation system and hardware (1). The user needs a computer with GPU that supports CUDA with computer ability >3.0 (2).This code run on Linux operation system, the original codes were compiled on Centos 6.4, so we highly recommend that the user run this code on the same level system or some higher version. The CUDA version is CUDA 9.0 and the Seismic Unix version is 4.3. 3. How to compile the code (1) down load, the code and examples, unzip it with tar –zxvf kpsdm.tgz (2) go to the src directory, change some include and library detail in Makefile for the CUDA and Seismic Unix, then run: make in the command line. (3). Go to the examples director , run the code by ./cudakpsdm par=mar.par (4). The imaging result is marmig.0, this is a sub file, you can display by : 2 suximage < marmig.0 perc=99 4. Parameters introduction (1) .The user can put all the parameters in a *.par file, like outflag=1. The necessary parameters are as follows: Table 1. the parameters of this program Number 1 Parameters Introduction of this parameters Infile su format seismic data for imaging 2 project directory of this imaging project 3 status name tell the status when running 4 inner number of traces in the infile 5 slineXY where the subline is : 1 in x direction, 2 in y direction 6 outflag 1: output stack 2. Output gather 7 weightflag if with amplitude preserve :1 yes 0 : no 8 mute if with mute ,please write 0 9 vpickf velocity file ,format introduced below 10 TTTdir where the ray path files in 11 TTToldnew if ray tracing with new velocity,1: no 2 : yes 3 12 gridfile geometry of this project ,introduced below 13 vsubmin min velocity subline 14 vsubmax max velocity subline 15 vsubinc interval of subline velocity 14 vcrsmin min velocity crsline 15 vcrsmax max velocity crsline 16 vcrsinc interval of crsline velocity 17 submin,sbumax,subinc imaging region of subline 18 crsmin,crsmax,crsinc imaging region of crsline 19 off= output offset bin if outflag=2 20 maxoff maximum offset in su infile 21 daperture , xaperture provide the aperture of imaging process 22 maxapertue the maximum aperture 23 nz imaging point in depth 24 dz interval of imaging point in depth 25 fz first imaging point in depth 26 device_list the GPU number of running the GPU code 27 verbose 28 maxmem show information when running maximum memory of used GPU 4 (2) The velocity format The velocity format should be like this: HANDVEL cdpnmber subline crsline 5(depth) 3000(velocity) 10 32000 HANDVEL cdpnmber2 subline2 crsline2 5(depth) 3200(velocity) 10 32000 (3) The Geometry format(take example of 2D marmousi ) 1 1 minimum subline of project 2 10 maximum subline of project 3 1 increased of subline 4 1 minimum of crstline 5 737 maximum of crsline 6 1 increased of crsline 7 0 x coordinate of minimum subline and crsline points 8 0 y coordinate of minimum subline and crsline points 5 9 0 subline increasment in x direction 10 12.5 subline increasment in ydirection 11 12.5 crsline increasment in x direction 12 0 crsline increase in direction 5. Run the examples The examples are to test the code by Marmousi model, you can run the code after compiling the source code. Goto the examples directory and run : ./ cudakpsdm par=mar.par After finished, you can display by : suximage < marmig.0 perc=99 you can change the parameters to further test of this code. 6
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