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Practical Well Log Standards for Acquisition Curves

Practical Well Log Standards for Acquisition Curves. Paul Maton, POSC Jim Theriot , POSC Alan Doniger, POSC April 2005. Outline. Business Drivers, Challenges Phase 1 outcomes Phase 2 approaches, results, examples Next Steps. Well Logs: Business Issues.

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Practical Well Log Standards for Acquisition Curves

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  1. Practical Well Log Standardsfor Acquisition Curves Paul Maton, POSCJim Theriot, POSCAlan Doniger, POSCApril 2005

  2. Outline • Business Drivers, Challenges • Phase 1 outcomes • Phase 2 approaches, results, examples • Next Steps

  3. Well Logs: Business Issues Huge numbers of curves (information overload) • Most oil company customers only load a small sub-set of curves into their data stores Complex naming at BOTH Curve and Tool level • Confusing even to petrophysicists • Others got lost years ago! Hard to find up to date information in public domain • Isolated lists, complex language Expert (petrophysicist) and generalist users have different requirements

  4. Information Overload - Business Value Note: Business Value does not take account of usage. It deals with the ‘average’ case Load Frequency High Business Value Most oil company customers only load a small sub-set of curves into their data stores Most Commonly Loaded Medium Business Value Loaded for specialist applications Rarely Loaded Loaded Curve Names

  5. Log Data Management: Challenges • Nomenclature • Logging companies’ Vocabularies • Oil companies’ Dictionaries • Classification for • Tools • Curves • Value • Who uses ... • Which logs... • How often ... • For what ...

  6. PWLS Version 1 • Classified ~2500 curves for ~100 tools from 3 logging companies • Defined business value – high, medium, low

  7. PWLS Version 2 Objectives • Clarify and refine Version 1 results • Initial focus on two primary use cases: • Classify acquisition curve instances based on logging company mnemonics • Use curve classifications to search for relevant acquisition curve instances • Additional areas of work • Recommended mnemonics for oil company generated curves: joined and interpreted • Classification of well log services and tools, e.g. for log header classification

  8. Generic Service/Tool Class: Generic Curve Class: Company: Service Class: Company Channel: Tool Series: Service-Channel Xref:

  9. Company Channel Class Property Class Well Log Curve Class RP66 Org codeCo. MnemonicDescription Business valueClassificationQuantity & UoM Generic Name----------------- ObjectPropertyTechniqueModifier(s)Function NameParent Class Description Channel, Curve and Property ‘Industry’ nomenclature ‘Company’nomenclature Maps to Subset of

  10. Curve Class Attributes • What is the object (or thing) whose properties we are measuring? • Formation, casing, cement, wellbore, acquisition, etc. • What (pure) property of the object are we measuring? • Density, porosity, velocity, etc. • What technique are we using to make the measurement (with the tool)? • Neutron, acoustic, etc. • Modifiers (or qualifiers) qualifying the (pure) Property • Deep / shallow; maximum / average / minimum, etc. • Function • Mathematical derivation / calculation, e.g. ratio, std. Deviation • Generic Curve Name • Composite “tag” based the most important attribute value used only for the small subset of highest value types of curves, e.g. neutron, resistivity

  11. Some Company Curve Classes

  12. More Company Curve Classes

  13. Channel, Curve Example 1 ‘Industry’ nomenclature ‘Company’nomenclature Company Channel Class Curve Class Maps to Generic Name: Gamma_Ray-------------------------------------------- Object: Formation Property: Gamma Ray Technique: -Modifier(s): -Function: - RP66 Org code: 150Co. Mnemonic: GRDescription: Gamma RayClassification: Gamma_Ray Units Class: API_Gamma_Ray

  14. Channel, Curve Example 2 ‘Company’ nomenclature ‘Industry’ nomenclature Company Channel Class Curve Class Maps to Generic Name: Electromagnetic_Caliper--------------------------------------------------- Object: Borehole Property: Caliper Technique: Electromagnetic Modifier(s): - Function: - RP66 Org code: 440Co. Mnemonic: PCALDescription: Caliper from Phase Shift Imbalance Business Value: HighClassification: Electromagnetic _Caliper Units Class: Cylinder_Diameter

  15. Links • PWLS General Web Link • Property Type Browser • Company Data Views • Industry Data Views • Channel to Curve Class Browser • Schema for PWLS Reference Data

  16. Current Focus: Usage • Users • Oil companies • Log analysts, Consultants • Data management repositories, companies • Suppliers • Logging contractors (Acquisition, Processing …) • Software developers and vendors • Evolve • User communities use PWLS and provide feedback • Revise specifications and implementations • Maintain Property, Curve and Tool catalogues

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