Seismic Variable Velocity Maping Technology And Applicating In KATAKE Area Of Tarim Basion

structural diagram by current variable velocity field can get a structural diagram to image structural form, it is very easy to image sructural form and top position of target stratum. When the stratum of workarea had been cut in a different stage ,the layer suffered stress and fold at a same time.result in the transverse change for the lithology vary.transfer time to depth by Using custom maping way,always result in error.developing and using a variable velocity to get a correct constucture map, it is a researc way to to a geophysicist for all time,The KaTaKe area is a risk explore region which contacted with HeNan oil field in the tarim basin. In Many year its explore degree is very low for only two denmension seismic data collected by different company and rare detecting well.igeological status is very complicate,the layer suffer stress,fold,truncation at different degree,result a huge risk in identify and describe to a trap.in the article analy the main factor which effect the sesmic velocity by understand these sesmic velocity idea,contrast the theory and compute way betwteen the DIX formula and the the ray track.build a seismic volocity field with stack velcity of a 2 demension seismic post-data,using the ray track technology in 3 dimensional space,gain more high precision than the rude stack velocity.sure to get the rule of underground velocity distributing,transfer structure into the map by add a precision of internal velocity and average velcity.Model chromatography is consisted of multi-theories of horizon control,ray track and wave equations,the ray track is to conduct it in a 3 dimensional space,calculate interval velocity and simultaneously calculate the spatial offset of reflection point deflecting incident point ,establish a velocity field and spatial geology model to carry out migration reversion .geodetic inclination angle,large scale of velocity distortion caused by tectonic wings are eliminated,thus an accurate structural diagram is obtained. At last look out a suit maping way which fit survey geological fact,offer a scientific evidence to directe oil and gas explore plan.