Generating common image gather using wave-field separation

US11041970B2 · kind B2 · utility

Assignee

• SAUDI ARABIAN OIL COMPANY · SA

Inventors

• Dongliang Zhang · Suzhou, CN
• Tong Wang Fei · Dhahran, SA
• Yi Luo · Dhahran, SA

Key dates

• Filing date: Feb 14, 2019
• Grant date: Jun 22, 2021
• Expiry date: Jun 30, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V2210/48
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present disclosure describes methods and systems, including computer-implemented methods, computer program products, and computer systems, for generating Angle Domain Common Image Gathers (ADCIGs). One computer-implemented method includes receiving, at a data processing apparatus, a set of seismic data associated with a subsurface region wherein the set of seismic data includes receiver signal data at a plurality of time steps; for each time step in the plurality of time steps: calculating a receiver wavefield based on the receiver signal data at the respective time step; separating a first direction receiver wavefield and a second direction receiver wavefield of the receiver wavefield using Hilbert transformation of the receiver signal data at the respective time step; and applying an optical flow process on the first direction receiver wavefield to calculate wavefield directions; and generating an Angle Domain Common Image Gather (ADCIG) based on the wavefield directions.