公开(公告)号：US20210239879A1

公开(公告)日：2021-08-05

申请号：US17247528

申请日：2020-12-15

Applicant: ExxonMobil Upstream Research Company

Inventor： Valeriy V. Brytik ,  Junzhe Sun ,  Carey M. Marcinkovich ,  Hong Zhao ,  Erik R. Neumann

IPC: G01V99/00 ,  G06F30/20 ,  G06F17/18

Abstract: A method for partitioning a search direction when using least squares reverse time migration (LSRTM) is provided. LSRTM may be used iteratively in order to improve imaging accuracy. As part of LSRTM, multiple local line searches may be performed. In particular, image space may be partitioned, such as by using a set of masks. The search direction, such as the gradient, may be partitioned using the set of masks. Local line searches may be performed for each partition of the search direction, resulting in finding respective line search constants. The respective line search constants may then be used for iterating the model in order to improve imaging accuracy.