Well Log Image Calibration

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Well Log Image Calibration

• Jim Theriot
• Jim.Theriot_at_POSC.org
• 1 713 267 5109

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Registration Error SourcesWhy do I need image
calibrations?
Traces calibrated on grid, but
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Usage Scenario Evaluate newly acquired field

• Get available well log data
• Scan and calibrate all well logs
• Generate cross-sections of selected wells,
  perform initial analysis, develop initial model
  of field
• Digitize key wells, perform detailed analysis,
  refine model of field

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Current Process

• hire contractor to Scan and calibrate all wells
• convert well log image calibration formats
• use applications to Generate cross-sections of
  selected wells, perform initial analysis, develop
  initial model of field

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Improved ProcessWhy do I need a standard?

• hire contractor to Scan and calibrate all wells
  per standards
• convert well log image calibration formats
• use standards-based applications to Generate
  cross-sections of selected wells,

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Well Log Calibration
document
wellbore
log
image
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WellLogDepthRegistration

• DocumentInformation about the calibration
  document
• WellboreInformation about the welbore
• LogInformation about the well log
• Image the calibration data

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DocumentInformation

• version
• source
• producing_application
• comments
• Parameters

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WellboreInformation

• well_uwi, wellbore_uwi
• well_name, wellbore_name
• operator
• field_name
• comments
• Parameters

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LogInformation

• LogName, LogType
• service_company_name, date_logged
• Total_depth, TDDate
• KBElev, DFElev, GLElev
• logged_interval
• curves
• name, uom, sections_recorded, scale,
  depthRangeRecorded,

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Image

• Name, nameType reference to image file
• Mimetype, filesize, imagPixelGeometry,
  ImageMargins
• HeaderSections, AlternateSections, LogSections
• checksum

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LogSection

• SequenceNumber, type, name
• logMatrix
• Scale, indexType, indexUom, indexReference
• Interval
• Upper/LowerCurveScaleRect
• Calibrations

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CalibrationLine

• index
• calibration points
• x,y image pixel coordinates
• role e. g. left edge
• track e. g. depth

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Calibration
CalibrationLine depth 6600 points
CalibrationLine depth 6725 points
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Delivery FrameworkHow do I get my (pairs of)
files?

• File data placed on detachable media or on
  local file system
• Internet data placed under web server, pulled
  via HTTP
• Web Service data provided via web service,
  pulled via SOAP, WITSML,
• Database storage is out of scope

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Taking it forward

• A fast-track project
• Participants A2D, ExxonMobil, IHS, Neuralog,
  Oilware, POSC
• Looking for more oil and vendor participants
• Schedule
• Publish for public review Jan 2005

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Questions?

• Jim Theriot
• Jim.Theriot_at_POSC.org
• 1 713 267 5109