Patent ID: 9562983
Date: 2017-02-07
CPC Classifications: G01V

Claim:
1. A computer-implemented method comprising: receiving, by data processing apparatus, vertical seismic profile (VSP) data of a subterranean region, the VSP data comprising ray paths of incident rays from a surface source to a reflector and from the reflector to a borehole receiver, and comprising locations of the surface source, the reflector and the borehole receiver; computing, by the data processing apparatus, four angle attributes for each image point based on the received VSP data; generating, by the data processing apparatus, five-dimensional (5D) angle-domain common-image gathers (ADCIG) according to a ray-equation method based on the four angle attributes; and migrating mode-converted energy PS-data in a time domain to avoid depth-to-time conversion in a post-processing process.