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Surface Deformation Monitoring (environmental and production related)

Surface deformation (Source: TRE)

PRODUCT DESCRIPTION

Category

Component products

 

Surface Motion

  • N/A

 

Uses

  • Subsidence monitoring - Land motion relating to fault lines or other causes
  • Subsidence monitoring - Reservoir management
  • Subsidence monitoring - Infrastructure monitoring
  • Surface Geology Mapping - Structural interpretation
  • Logistics planning and operations - Facility siting, pipeline routing and roads development

Geo-information requirements

  •  Surface and ground motion
  • Terrain information

Description

Surface movement can be accurately determined by processing SAR imagery acquired over an area of interest with the same geometry using advanced interferometric techniques. Surface movement information is typically visualised using ground movement maps or in GIS systems, where movement due to oil & gas production (including related activities) or to natural phenomena can be identified and analysed.

Resulting movement maps can be used to determine the impact of reservoir production, enable efficient reservoir management and improve understanding of reservoir dynamics, for example: reservoir compartmentalisation, subsurface fluid dynamics and fault reactivation.

Surface movement is identified for the entire period of SAR acquisitions, where satellite imagery is tasked to acquire for specific periods (short- or long-term), depending on the requirements of the Client.

SAR imagery is processed at discrete intervals for the production of ground movement information and depending on the satellite(s) used, update maps of surface movement can be provided on a weekly, monthly or annual basis. Typical SAR acquisition repeat cycles are every 4 to 24 days.

Surface movement measurements are provided along the satellite’s line-of-sight and, with the availability of both ascending and descending geometry SAR datasets, in the vertical and horizontal directions.

Known restrictions / limitations

  • Accuracy and density of measurements dependent on a number of factors, including the wavelength of SAR sensor and repeat time of the satellite
  • North-south movement cannot be identified
  • Processing for high-accuracy ground movement can be performed only after acquiring a minimum number of SAR images (approximately 15-20 SAR images with same geometry)
  • No surface movement information achievable over water bodies
  • Density of measurement points identified over vegetated / swampy areas decreases
  • Surface movement is a combination of all active layer deformation contributions

Lifecycle stage and demand

Pre-licensing

Exploration

Development

Production

Decommissioning

 

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Exploration & Development:

  • Baseline mapping of natural ground movement pre-production phase and ground movement related to production activities for improved reservoir management
  • Critical current ground movement information for the identification of stable ground to support effective and safe land seismic surveys and for the planning of infrastructure, pipelines, wellheads and area development
  • Analyses of surface movement to provide information on subsurface features including compartmentalisation, fault reactivation, fluid dynamics, etc.
  • Identification of stable ground for the safe and effective planning of ground surveys and infrastructure

Production:

  • Surface subsidence / uplift associated directly with reservoir production can be determined and quantified. Resulting maps can be used to improve reservoir management.
  • Ground movement over infrastructure, e.g. wellheads, pipelines, etc. can be monitored in order to identify potential stability issues

Decommissioning:

  • Same as production. Once the well is closed, remediation monitoring will confirm the stabilisation of the site before transfer to regulator/Crown.

Geographic coverage and demand

Demand and coverage is globally onshore or on offshore platforms.

CHALLENGES ADDRESSED

OTM:001 Identifying effect of fault reactivation
OTM:002 Tracking fluid migration in the subsurface
OTM:003 Subsidence from reservoir draw-down
OTM:004 Regulatory verification relating to injection of fracking fluids
OTM:005 Monitoring natural fault movement
OTM:006 Technical verification relation to injection of fracking fluids
OTM:007 Identify communication between producing zones
OTM:010 Monitoring ground movement along pipelines
OTM:011 Surface infrastructure movement relative to sub-surface
OTM:014 Forecasting sand dune migration
OTM:020 Tracking groundwater tables
OTM:051 Identification of fault lines
OTM:060 Forecasting landslide locations

 

HC:1105 Identify permafrost zone for data analysis

HC:2501 Characterization of surface/near-surface structural geological properties for infrastructure planning

HC:2504 Identification of slope instability

HC:2505 Identify geophysical properties of the subsurface

HC:3101 Baseline and monitoring of areas with active faults and subsidence

HC:3201 Assessment of infrastructure placement and effects to the surrounding environment

HC:3203 Management of surface impacts due to ground deformation from operations

HC:3204 Monitor stability of surface reservoirs such as settling ponds

HC:3302 Assessing ground deformation to support enhanced recovery operations

HC:3303 Monitoring effectiveness of steam assisted gravity drainage (SAGD) operations

HC:4201 Remediation and reclamation monitoring

HC:4208 Identification of groundwater table to reduce potential issues during seismic activity
HC:4301 Map and monitor induced seismic hazards

HC:5201 Monitoring assets for risk management

HC:5306 Assessing terrain stability for infrastructure planning in permafrost environments

PRODUCT SPECIFICATIONS

Input data sources

Radar: VHR2, HR1, HR2

Spatial resolution and coverage

Spatial resolution: 20x5 m / 3x3 m / 1x1 m pixel size

Coverage: 250x150 km / 100x100 km / 40x40 km / 30x50 km /  10x10 km

Minimum Mapping Unit (MMU)

Related to pixel size of satellite imagery used. One ground measurement point can be identified for each pixel in satellite image.

Accuracy / constraints

Thematic accuracy:  Ground movement can be determined to millimetre accuracy (with a sufficient number of SAR images)

Spatial accuracy: In ideal conditions, one measurement point is identified in each SAR image pixel

Accuracy assessment approach & quality control measures

MonteCarlo statistical approach

Frequency / timeliness

Observation frequency:  Constrained by satellite repeat cycle, typically 4-24 days. Appropriate satellites can be chosen in terms of spatial and temporal resolution.

Timeliness of delivery: Depends on the requirements of the Client and processing required

Availability

Basic analysis can be performed quickly (24-48 hours) whilst integrated products require detailed analysis (2 weeks).

Delivery / output format

Data type:

  • Vector formats
  • Raster formats (depending on client requirements)

File format:

  • Geotiff or GIS shapefile (standard - any other OGC standard file formats)
          

 Download Product Sheet

 

Lead Author:TRE
Peer Reviewer:Hatfield Consultants

Author(s):

Alastair Belson

Document Title:

Surface Deformation Monitoring (environmental and production related)

# of Pages:

5

Circulation:

Internal – Project consortium and science partners

 

External – ESA

 

 

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