Transcript Well Log Image Calibration

Well Log Image Calibration
Jim Theriot
[email protected]
+1 713 267 5109
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 crosssections 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
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version
source
producing_application
comments
Parameters
WellboreInformation
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well_uwi, wellbore_uwi
well_name, wellbore_name
operator
field_name
comments
Parameters
LogInformation
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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
Questions?
Jim Theriot
[email protected]
+1 713 267 5109