Optimized strategy for obtaining reservoir responses via Proximity Transformation

The reservoir-oriented local inversion schemes, where surface data is first transformed to local reflection data, are highly sensitive to the given input dataset and their success is directly linked to the accuracy and reliability of this data. In this paper, we demonstrate an optimized strategy to accurately estimate the down- and upgoing wavefields at the subsurface target depth level. The proposed optimized scheme is an extension to the standard Joint Migration Inversion implementation in which we propose to include the upgoing wavefield update at the target depth level at the later stages of the inversion algorithm. It is being embedded as a part of the first step, of a two-step procedure, i.e. Joint Migration Inversion followed by Proximity Transformation, to estimate the impulse response from the target area below a complex overburden. The paper also highlights the importance of correctly handling the internal multiples in the inversion scheme.