层析反演静校正技术在宁夏YL地区地震资料处理中的应用

Application of Tomography Inversion Stat ics Technology on Data Processing in YL Area, N ngx ia

(中原油田分公司物探研究院)

Geophysical Research Institute,
Zhongyuan O ilf ie ld Company, SINOPEC, Puyang
457001, China

Surface m ode l tomog raphy inve rs ion is the techno logy
about non- linear m ode l inversion, w hich applies the m ed ia
ve locity structure built by the invers ion o f trave l time and path
o f se ism ic first arr iva l ray, w ithout be ing restricted by
long itud inal and latitud inal d iversifica tion o f surface and near
surface structure. Based on the tim e errors betw een forward
first a rr iva l tim e and actua l first arr iva,l ve loc itym ode l keeps
to be m odified by the m eans o f repea t iterative un til the
precision o f erro rs m eets the requ irement. Because o f the
mu ltip licity of sur face layer structure in YL area, N ingx ia,
and the comp lex ity o f the surface layer struc tures, the veloc ity
va ries rapid ly in latitude, and strong no ise near the surface
appears there, show ing the serious prob lem s o f the m idd lew
avelength, long-wave leng th and sho rt-w ave leng th sta tics in
the se ism ic sections. A fte r be ing applied tom ography
inversion statics in th is area, the sta tics problem for all
w avelengths w ere se ttled, the e ffect o f processing w as
im proved clear ly.