Target-oriented least-squares reverse-time migration with Marchenko redatuming and double-focusing: Field data application

Abstract

Recently, the focus of reflection seismologists has shifted to applications where a high-resolution image of the subsurface is required. Least-Squares Reverse-Time Migration (LSRTM) is a common tool used to compute such images. Still, its high computational costs have led seismologists to use target-oriented LSRTM for imaging only a small target of interest within a larger subsurface block. Redatuming the data to the upper boundary of the target of interest is one approach to target-oriented LSRTM. Still, many redatuming methods cannot account for multiple scatterings within the overburden. This paper presents a target-oriented least-squares reverse time migration algorithm which integrates Marchenko redatuming and double-focusing. This special redatuming method accounts for all orders of multiple scattering in the overburden for target-oriented LSRTM. Additionally, the paper demonstrates that a double-focusing algorithm can further reduce the size of the data by reducing both spatial and temporal dimensions. This algorithm is applied to field data acquired in the Norwegian Sea.Comment: This preprint has been submitted to Geophysics journal for peer-revie