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

2. 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