REMOTE SENSING APPLIED TO

SEISMIC PLANNING

REMOTE SENSING O&G STUDYGENERAL INFORMATION

CONTACT :

Remote sensing could reduce errors and optimize operations

Remote Sensing These cost effective technics and image processing methodologies combined with expertise on surface conditions and geomorphology help reducing risks and provide good pre-analysis assessments.

REMOTE SENSING O&G STUDYGENERAL WORKFLOW CONCEPT

Seismic Position Signal(SPS)

Theoretical planning

Field control of SPS

Design possible Design impossible

Point positioning GPS survey

Design to mobileUnit

Source shot points

QC

Data acquisition

Point removal in SPS

Simulation

Line pre-plotpre-planning

Scouting for designand camp sites

Line cutting and access clearing

Seismic acquisition

Dynamite Vibroseis

ESBS - ESIA

Site inventory

Ecologicalsensitivity

Socio-culturalsensitivity

Pollution

Demobilization

Recommendations

Remote sensing applicability

REMOTE SENSING O&G STUDYREMOTE SENSING IMAGES

Satellite date resolution (pixel size)

LR : Low Resolution (> 15 m)MR : Middle Resolution (10 - 15 m)HR : High Resolution ( 2-5 – 5 m)VHR : Very High Resolution (0.5 – 1 m)

Digital mapping with MR gives large coverage 1:50000 to 1:100000 maps at low cost.

Digital mapping with VHR gives details maps at 1:1500 to 1:5000 for field operation.

REMOTE SENSING O&G STUDYNEW PROJECTSHOT DESERTHOT DESERT

COLD DESERTCOLD DESERT

JUNGLEJUNGLE

SHALLOW WATERSHALLOW WATER

REMOTE SENSING SUITABILITY FOR GROUND SURFACE PARAMETERS

REMOTE SENSING O&G STUDYSATELLITE IMAGERY FOR ACCESS STDUDIES

CHALLENGE OBJECTIVESCHALLENGE OBJECTIVES PROPOSED SOLUTIONSPROPOSED SOLUTIONS

Access routing and soils types

Type of vibrators

Topography

Radio antenna location

Cover signal for radio devices

Mapping of Facilities

Rock and soils classification

Height variations classes

Geomorphic parameters

3D viewing

Access mapping

Height variations classes

Vegetation mapping

Combination of different parameters to represent an accessibility map for complex area

REMOTE SENSING O&G STUDYLOGISTICS PARAMETERS

HOT DESERT CHALLENGEHOT DESERT CHALLENGE

SHALLOW SHALLOW WATERWATER

CHALLENGECHALLENGE

Risk assessment

Camp site settlement

Available water Resources

Loosed or compacted soils

Access mapping

Slope of dunes

Geomorphic parameters

Dunes movementsIdentification of main access waterways for seismic operations.

Waterways type : width, settlement, banks type, sensitivity

Incidence of network during seismic operations : waterways (rather straight) / natural network (more sinuous).

Analysis of meteorological conditions / Flooding risk

Bathymetry parameters

REMOTE SENSING O&G STUDYENVIRONMENT AND SECURITY

JUNGLE CHALLENGEJUNGLE CHALLENGE

Line and corridor opening

Impact on wildlife (fauna and flora)

Risk assessment

Near shore pollution

Vegetation mapping

Vegetation indices and classification

ENVIRONMENT BASELINE STUDY (EBS) ENVIRONMENT BASELINE STUDY (EBS)

• Initial inventory that will be used as a reference for impact study

• Impact of openings for track access :

o Minimize distances and detourso Presence of pre-existing access and seismic

lines for reuse.

• Impact on soils (drainage and erosion)

• Natural reserve and compliance with local laws

• Identify ecological sensitive sites

• Identify any pre-existing damage / pollution resulting from industrial activities, past or present.

• Position of the camps for teams security

REMOTE SENSING O&G STUDYFIELD BOOK FOR OPERATION TEAM

rock limestone sandATLAS AND GIS DATABASE:

Providing help to select model of geophone and vibro-sourc vs type of terrain

Providing high resolution satellite image and land use interpretation.

Providing of geographic database in digital format with DEM XYZ.

As lithology type is very important to evaluate the contact between the ground and vibrator: providing information to optimize material and methodology.

REMOTE SENSING O&G STUDYCASE STUDY – QUICK-LOOK PRE-ANALYSIS

Statistic analysis of geomorphology

> Methodology of seismic acquisition

Flat reg soilsHabitats and culturesSand dunes

Folded bedrocksFlat surfacesSebkhasSand dunes

7-9°10-14°15-25°

Slopes30 m DEM (SRTM)

High cuestasSandstones

Slope analysis to plan seismic surveys

REMOTE SENSING O&G STUDYCLUSTER POSITIONING & VALIDITY

Cluster positioning by selected criterion

> slope and hydrographic network distance

Cluster validity automatically processed using GIS

Pattern: regular and rectangular kernel of 2500m x 900m, Must be aligned on the N110E direction.

Cluster: Ideally situated in the center of the pattern. Smaller than the pattern: 100m x 150m and floating in a buffer zone of 500m x 300m into the pattern

Validation must fulfill at least 2 criteria

2nd criterion: Hydrography

Simulated GIS cluster pattern

Validated cluster

No validated cluster in pattern

BufferPattern

Cluster

1st criterion: Slope

REMOTE SENSING O&G STUDYLINES POSITION OPTIMISATION

Design of seismic lines:

•Theoretical and optimized position for geophones•Use of existing roads & tracks•Calculation of valley Length and mid-height left and right of the river channel.

• Selection of upper cuesta line of valleys by threshold on slopes automated digitization and extraction

• Processing of asymmetry of valley indices (Ratio W/H)• GIS processed attributes table related to point and

lines

REMOTE SENSING O&G STUDYGEOLOGY ANALYSIS

Dip and thickness calculation

Geologic mapping

=> Help for seismic planning

Geostatistics

Orientation

Length

Density

Connectivity

Spacing

Data strips extraction along topographic sectionSub-Surface modelisation

Photo-interpretation of fault/fracture network Detection of morphologic scarps from DEMClassification of faults (orientation, length, type)Calculation of spacing between faults within orientation classes

=> Guides for line positioning

REMOTE SENSING O&G STUDYACCURATE TOPOGRAPHIC PRODUCTS

DEM ALOS PRISM 5m

DEM SRTM / GDEM 30m

DEM SRTM 90m

SATELLITE ALOS DEM PRODUCT :

XY accuracy: 5mZ accuracy: 2,5 to 3m

Maximum scale analysis is 1/8500Optimized scale analysis is 1/12000

Easy to produce on areas cloud freeon all continents

REMOTE SENSING O&G STUDYALTERNATIVE DEM PRODUCTS

BETTER DEM FOR :

Orthorectified productsStereoscopic photo-analysisDEM processingAnaglyph products

Geological mapping, Tectonic GeomorphologyDip processingTopographic profilesHypsometry

Minimizing distortion on steep slopes - Orthorectifaction Adjusted mapping of photo-horizonsAccurate Z values for accessibility mapping

30m SRTM DEM 1m LIDAR

ALTERNATIVE DEM :

•Best than GLOGAL DEM•Quickly and low cost than LIDAR

REMOTE SENSING O&G STUDYSEMI-AUTOMATED PRODUCTS

Topographic correction for Geophysics

3D viewing

Topographic profile

Slope map

Morphometry

Hydrography

AccessibilityImproved DEM XYZ accuracy:

1cm to 10m depending on technics

PRE-ANALYSIS

GIS DATABASE

REMOTE SENSING O&G STUDYSUMMARY

Planning and design of seismic surveys face several challenging constraints for quality acquisition:

Field accessibilityLogisticsEnvironment and SecurityAppropriate seismic sourcesStrike and dip positioning of linesSeismic velocity and topographic correctionsDemobilization of sitesCoastal sensitivityNatural hazards and risks assessment

Satellite imagesDigital Elevation Model

Topography

Geology

Land use

Environment

Pre Analysis

Topography

Campaign planning

Survey