Repeatability indicator based on shot illumination for seismic acquisition

Patent metadata

Field	Value
Publication number	US-9733374-B2
Application number	US-201314102592-A
Country	US
Kind code	B2
Filing date	Dec 11, 2013
Priority date	Dec 17, 2012
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

Methods and systems for similarity indicator calculation associated with seismic data acquisition are described. A similarity indicator value can, for example, be based on a normalized partitioned intensity uniformity (PIU) metric. In another aspect, shot imprints are compared by mapping a base (reference) shot imprint onto a current sample of a shot imprint before calculating the similarity indicator value. The similarity indicator value is associated with the shot imprint location used in the calculation and allows re-shooting of only the areas where an insufficient quality of shot data is detected based on a preconfigured threshold value for the similarity indicator.

First claim

What is claimed is:

1. A method, performed in at least one processor, for generating a similarity indicator between seismic datasets acquired over a survey area, said method comprising:
obtaining a first seismic dataset collected at a first time and a second seismic dataset collected at a second time;
processing with the at least one processor said first seismic dataset and said second seismic dataset as first and second images, with pixels in said first and second images being associated with reflection points;
calculating a first image registration metric based on said first image and said second image;
calculating a second image registration metric based on one of said first image and said second image;
generating a similarity indicator between said first seismic dataset and said second seismic dataset using said first and second image registration metrics; and
reshooting at one or more positions in the survey area determined based on the similarity indicator.

2. The method of claim 1 , wherein said first seismic dataset is a first shot imprint, said second seismic dataset is a second shot imprint, and said reflection points having intensity values associated with illumination amplitudes.

3. The method of claim 2 , wherein said calculation of said first image registration metric further comprises:
partitioning said first shot imprint into iso-intensity datasets; and
mapping said iso-intensity datasets on said second shot imprint.

4. The method of claim 2 , wherein intensity data associated with said first shot imprint, said second shot imprint, and a mapped shot imprint is based on illumination.

5. The method of claim 2 , wherein said first image registration metric is:

PIU
⁢

⁢

(

base
,
monitor

)

=

∑
b

⁢

⁢

n
b

N

⁢

σ
b

⁡

(
monitor
)

μ
b

⁡

(
monitor
)

where N is the total number of pixels in the first and second shot imprints, n b is the number of pixels within iso-intensity set b, μ b is the mean measured on the second shot imprint within each mapping b T of set b and σ b is the standard deviation measured on the second shot imprint within each mapping b T of set b as:

μ
b

⁡

(
monitor
)

=

1

n
b

⁢

∑

x
∈

b
T

⁢

⁢

I
monitor

⁡

(
x
)

σ
b
2

⁡

(
monitor
)

=

1

n
b

⁢

∑

x
∈

b
T

⁢

⁢

(

I
monitor

⁡

(
x
)

-

μ
b

⁡

(
monitor
)

)

2

where the first shot imprint corresponds to a base and the second shot imprint corresponds to a monitor,
and wherein the second image registration metric is:

PIU
⁢

⁢

(

base
,
base

)

=

∑
b

⁢

⁢

n
b

N

⁢

σ
b

Assignees

• Cgg Services Sa
• Cgg Services Sas

Inventors

• Svay Julie
• Bousquie Nicolas
• Mensch Thomas
• Siliqi Risto

Classifications

• G01V1/34 Primary

  Displaying seismic recordings {or visualisation of seismic data or attributes} · CPC title

• G01V1/308 Primary

  Time lapse or 4D effects, e.g. production related effects to the formation (fluid flow per se E21B47/00) · CPC title

• G01V2210/612

  Previously recorded data, e.g. time-lapse or 4D · CPC title