well log image calibration jim theriot [email protected] +1 713 267 5109
TRANSCRIPT
Registration Error Sources:Why do I need image calibrations?
Traces calibrated on grid, but …
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
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
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, …
Well Log Calibration
document
wellbore
log
image
WellLogDepthRegistration
• DocumentInformation– about the calibration document
• WellboreInformation – about the welbore
• LogInformation– about the well log
• Image – the calibration data
DocumentInformation
• version
• source
• producing_application
• comments
• Parameters
WellboreInformation
• well_uwi, wellbore_uwi
• well_name, wellbore_name
• operator
• field_name
• comments
• Parameters
LogInformation
• LogName, LogType• service_company_name, date_logged• Total_depth, TDDate• KBElev, DFElev, GLElev• logged_interval• curves
– name, uom, sections_recorded, scale, depthRangeRecorded, …
Image
• Name, nameType– reference to image file
• Mimetype, filesize, imagPixelGeometry, ImageMargins
• HeaderSections, AlternateSections, LogSections
• checksum
LogSection
• SequenceNumber, type, name
• logMatrix
• Scale, indexType, indexUom, indexReference
• Interval
• Upper/LowerCurveScaleRect
• Calibrations
CalibrationLine
• index
• calibration points– x,y – image pixel coordinates– role e. g. ‘left edge’– track e. g. ‘depth’
Calibration
CalibrationLine depth: 6600 points
CalibrationLine depth: 6725 points
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
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
