Abstract

Estimating deep subsurface reservoir properties from surface seismic data is a challenging task. This challenge becomes even larger when a target area is situated below a complex overburden. In this paper, we demonstrate a noval process called JMI-res, based on Joint Migration Inversion (JMI), to estimate the reservoir elastic parameters from the surface seismic elastic data for a complex subsurface scenario. In JMI-res, we first obtain the accurate local impulse responses at the target depth level and then we apply a localized inversion scheme on the estimated impulse responses to get the reservoir elastic parameters. Moreover, the velocity estimation is an integral part of JMI, thus, we do not require an accurate pre-estimated velocity model in JMI-res. We also show that the redatuming step of JMI-res provides much more reliable impulse responses, compared to standard redatuming based on time reversal of recorded data, because multiple scattering and transmission effects are fully accounted for.