advances of agg technology in cgg

Advances of AGG technology in CGG Exploration 17, October 25, 2017

Tianyou Chen*, Mark Dransfield

Six Falcon® AGG Systems are in Operation Globally

Einstein

Galileo

Feynman

Cavendish

Newton Newton

2

Kepler

… keep improving sensors and processing

3

Falcon

Falcon Plus

Full Spectrum Falcon

sGrav Enhanced processing

FTG Plus

½ noise

both ends of the spectrum

20 x more sensitive, 10 x more resolution

Falcon Plus – noise floor

10m 100m 1km 10km 100km0.01E

0.1E

1E

10E

Low-passFilterCutoffWavelength

VerticalGravityGradient

FixedWingAGGRMSNoiseFloors

FalconFalconPlus

Enhanced Processing

§  Exploits how data is acquired

§  Spatial frequency of noise from acquisition different from spatial frequency of geologic signal

§  Enhancements are achieved by designing filters to remove acquisition noise while retaining geologic signal

5

Enhanced Processing

6

Standard Processing

Enhanced Processing

Acquisition Noise Removed

Standard Processing Noise Power: •  1.15 E √km

Enhanced Processing Noise Power: •  0.56 E √km

Enhanced Falcon – noise floor

10m 100m 1km 10km 100km0.01E

0.1E

1E

10E




FalconFalconPlusEnhancedFalcon

Long Wavelength Augmentation

Long Wavelength Gravity - sGrav

§  First commercial strapdown gravimeter

§  Able to acquire quality data in typical Falcon survey conditions –  Drape flying –  Moderate levels of turbulence

§  No moving parts

§  Small, light weight and simple installation

9

Full Spectrum Falcon

10

Full Spectrum Falcon – noise floor

10m 100m 1km 10km 100km0.01E

0.1E

1E

10E




FalconFalconPlusFullSpectrumFalcon

FTG Plus

FTG Plus development

•  A new FTG Plus non-rotating accelerometer architecture

•  Under development at Lockheed Martin

•  Seeks to provide sub-Eö airborne performance. •  Performance goals for FTG Plus are 0.25 E ö↑2 /

Hz over a pass band from 0.1 mHz to 1.5 Hz (5 Hz)

! sensor noise so low as to be irrelevant

13

FTG Plus in AS350 B3

FTG Plus – noise floor

10m 100m 1km 10km 100km0.01E

0.1E

1E

10E




FalconFalconPlusFullSpectrumFalconFTGPlus

Summary

§  Falcon Plus – Halves the noise of the standard Falcon technology

§  Full Spectrum Falcon –  Enhanced processing reduces acquisition noise

–  Improves resolution for line spacing up to 200m – Decreases noise power for line spacing greater than 250m

–  sGrav provides long wavelength gravity §  FTG Plus

–  20 times more sensitive, 10 time more resolution

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Thank you

advances of agg technology in cgg

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