US 10,295,685 B2Granted

Generating common image gather using wave-field separation

AssigneeSaudi Arabian Oil Company

InventorsDongliang Zhang, Tong Wang Fei, Yi Luo

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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.

Claims7

Dependent claims

A method for generating subsurface common image gathers, comprising:

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, by the data processing apparatus, a receiver wavefield based on the receiver signal data at the respective time step;
separating, by the data processing apparatus, 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, by the data processing apparatus, an optical flow process on the first direction receiver wavefield to calculate wavefield directions;
generating, by the data processing apparatus, an Angle Domain Common Image Gather (ADCIG) based on the wavefield directions;
and
analyzing the ADCIG to determine at least one of a trap or a structure of hydrocarbon accumulation in the subsurface region.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/480,708Filed 6 Apr 2017
Published: US 2018/0292554 A111 Oct 2018
Granted: 21 May 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G01V 1/303
Analysis: for determining velocity profiles or travel times
G01V 1/32
Processing seismic data, e.g. for interpretation or for event detection: transforming one recording into another or one representation into another
G01V 1/28
Seismology; Seismic or acoustic prospecting or detecting: processing seismic data, e.g. for interpretation or for event detection
G01V 1/36
Processing seismic data, e.g. for interpretation or for event detection: effecting static or dynamic corrections on records, e.g. correcting…