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Well Log Image Calibration

Well Log Image Calibration. Jim Theriot Jim.Theriot@POSC.org +1 713 267 5109. ________scanner________. _________printer_________. _______logging camera_______. Registration Error Sources: Why do I need image calibrations?. Traces calibrated on grid, but ….

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Well Log Image Calibration

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  1. Well Log Image Calibration Jim Theriot Jim.Theriot@POSC.org +1 713 267 5109

  2. ________scanner________ _________printer_________ _______logging camera_______ Registration Error Sources:Why do I need image calibrations? Traces calibrated on grid, but …

  3. 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

  4. 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

  5. Improved Process:Why 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, …

  6. Well Log Calibration document wellbore log image

  7. WellLogDepthRegistration • DocumentInformation– about the calibration document • WellboreInformation – about the welbore • LogInformation– about the well log • Image – the calibration data

  8. DocumentInformation • version • source • producing_application • comments • Parameters

  9. WellboreInformation • well_uwi, wellbore_uwi • well_name, wellbore_name • operator • field_name • comments • Parameters

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

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

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

  13. CalibrationLine • index • calibration points • x,y – image pixel coordinates • role e. g. ‘left edge’ • track e. g. ‘depth’

  14. Calibration CalibrationLine depth: 6600 points CalibrationLine depth: 6725 points

  15. Delivery Framework:How 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

  16. 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

  17. Questions? Jim Theriot Jim.Theriot@POSC.org +1 713 267 5109

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