Prediction of lateral variability in fracture intensity using multicomponent shear-wave surface seismic as a precursor to horizontal drilling in the Austin Chalk

摘要: Summary A method of multicomponent multisource shear-wave interpretation, utilizing the output Alford rotation for separating fast and slow particle motion stacks in azimuthally anisotropic media, yielded a qualitative prediction lateral fracture intensity variation prior to horizontal drilling. The exploits fundamental difference between two when vertical, aligned fractures are source splitting. shear wave (S1) section is insensitive since its parallel fractures; hence, reflectivity on S1 CDP-stacked should be likewise fractures. (S2) section, however, possesses perpendicular planes, so will affect velocity reflectivity. Examination sections seismic line reveals laterally consistent reflector strength Austin Chalk, horizon interest, but inconsistent same S2 study area. Reflector dimming was interpreted as indicating maxima. Horizontal drilling confirmed both azimuth predictions, resulted significantly higher initial hydrocarbon production than surrounding wells.