High-precision near-surface velocity modeling and application in complex mountainous water-land mixed seismic survey
The ZQX seismic work area has favorable petroleum geological conditions,but its near-surface is very complex with farmlands and villages,mountains,gobi gravel,reservoirs,etc.And for the first time,we adopted air gun excitation and streamer reception for seismic acquisition in the water area.In order to establish a high-precision velocity model for the water-land mixed seismic survey,we have proposed to pick a take-off point and double-constrained inversion with water and uphole.First,pick up the accurate first break peak time under different excitation and reception modes.Next,calculate the time differ-ence from peak to jump using high signal to noise ratio channels.Finally,interpolation solves the transition time from peak to jump in low S/N trace.On this basis,a tomographic inversion method is adopted using water velocity hard constraint and up-hole soft constraint and solved the problem of high-precision near-surface velocity modeling in the ZQX survey,which has re-sulted in a much better image.
water-land mixed seismic acquisitionturning peak time to first-arrival timedouble constrainttomographic inversionstatic correction
万方数据
维普
