2005-04-05 geophysical site surveys, hydrofest 2005 - 5th april
TRANSCRIPT
HYDROFEST 2005A FAMILIARISATION COURSE
GEOPHYSICAL SITE SURVEY
HYDROFEST 2005A FAMILIARISATION COURSE
GEOPHYSICAL SITE SURVEY
Presented by Øyvind Ruden.Geophysics Project Manager
Fugro Survey Limited
Presented by Øyvind Ruden.Geophysics Project Manager
Fugro Survey Limited
• INTRODUCTION• PRINCIPLES, METHODS AND TOOLS• SITE SURVEY OPERATIONS• FUTURE DEVELOPMENTS
• Exploration Surveys• Rig Site Surveys• Platform Site Surveys• Pipeline Route Surveys• Cable Route Surveys• Field Development Surveys• Clearance, Abandonment and
Inspection
TYPES OF SURVEYS
JACK UP RIGS SEMI SUBMERSIBLES
PLATFORMS
PRINCIPLES, METHODS AND TOOLS
Use of geophysical ‘remote sensing’techniques, calibrated by some limited
‘ground truth’ sampling.
BASIC PRINCIPLE
ACOUSTIC PRINCIPLES
• Source• Receiver• Recorder• Interfaces and Media
THE EARTH AS A BANDPASS FILTER
ACOUSTIC METHODS
• Echo SoundingSingle BeamMulti Beam
• Side Scan Sonar
ECHO SOUNDERS
ECHO SOUNDERS
ECHO SOUNDERS
SIDE SCAN SONAR
SIDE SCAN SONAR
SIDE SCAN SONAR
SIDE SCAN SONAR
SEISMIC PRINCIPLES
SEISMIC PRINCIPLES
SINGLE CHANNEL METHODS
• Pingers• Boomers• Mini-airguns• CHIRP• Sparkers
SINGLE CHANNEL METHODS
SINGLE CHANNEL METHODS
SINGLE CHANNEL METHODS
SINGLE CHANNEL METHODS
SINGLE CHANNEL METHODS
SINGLE CHANNEL METHODS
MULTI CHANNEL METHODS
MULTI CHANNEL METHODS
MULTI CHANNEL METHODS
MULTI CHANNEL METHODS
HIGH-RESOLUTION 2D SEISMIC
HIGH-RESOLUTION 2D SEISMIC
DATA PROCESSING
EDITING
Demultiplexed
Edited
TEST/MAIN PROCESSING
Geometry Specification
Deconvolution
Sorted into CMP’s
Filtered
Amplified
Velocity Analysis
NMO
Stacked
FINAL PROCESSING
Migration
3D SEISMIC
3D SEISMIC
GEOTECHNICAL SAMPLING
• Grab Samplers
• Gravity Corers
• Vibrocorers
• Cone Penetrometers
• Boreholes
INTERPRETATION AND PRESENTATION
SOIL PROVINCES
MAP
ALIGNMENT SHEET
FORMAT
SEABED VISUALISATION
3D perspective
Shaded relief
Colour coded seabed gradient
3D VISUALISATION
SITE SURVEY OPERATIONS
THE SURVEYORS ROLE
• Construction of Survey Programme
• Positioning of Vessel
• Positioning of Sensors
• Quality Control of Bathymetry data
SURVEY DESIGN
• Water Depth
• Type of Installation
• Expected Hazards
• Flexibility of Location
• Environmental Conditions
• Time and Cost
SURVEY DESIGN
• Dual Pass Survey
• Integrated Surveys
• Dual Streamers
• High Resolution 3D
THE SURVEY PLATFORMVessel antenna
position
(reference point)Back deck where side scan sonar, boomer and digital
seismic equipment is launched
Bridge
Instrument room
(below water line)Living quarters
FUTUREDEVELOPMENTS
FUTURE DEVELOPMENTS
• High Resolution 3D
• Integrated Surveys
• AUV
• GAMBAS (Seismic Refraction)
COMPARISON WITH EXPLORATION 3D DATA
GAMBAS SYSTEMR
FUTURE DEVELOPMENTS: AUV
• Max Working Depth:3000 m
• Max Speed: 8 knots
• Min Speed: 1.5 knots• Survey Speed: 3-6 knots
• Length: 5.5 m• Width: 1.27 m
• Bottom Time: 20 hours• Battery: 42 kwh NMH
AUV Platform
FAQ’sSpecifications
FUTURE DEVELOPMENTS: AUV