2005-04-05 geophysical site surveys, hydrofest 2005 - 5th april

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