Simultaneous prediction of velocity and angle-dependent reflectivity in time domain FWI

Ziguang Su, Daniel O. Trad, Da Li

We present an iterative non-linear inversion method to simultaneously predict both velocity and amplitude-preserved angle-domain-common-image-gathers (ADCIGs). The key aspect of our technique is the extraction of angle information from the solution of a direction-vector-based wave equation in acoustic with density media.The extraction is based on wave propagation direction only and independent of acquisition coordinates, which makes it appropriate for blended acquisition, also known as simultaneous seismic source acquisition. The time domain FWI using nonlinear conjugate-gradient method is used as our iterative inversion method. The velocity model is updated at each reflection angle sequentially inside each iteration.