Well Log Analysis and Formation Evaluation

Course Duration: 5 days, including lecture-based modules and hands-on exercises. Shorter versions of course are more typically in a workshop format to emphasize hands-on training. Log Analysis Workshop 1 is a 3 day course focused on triple-combo (GR/SP, Res, and N–D logs) and Log Analysis Workshop 2 is a 2 day course focused on additional logs such as acoustic, dielectric, NMR, etc.

Specific Client Customization: In-house versions of this course can be customized to fit specific client needs, including course duration, in-person or online, topics coverage, and workshop component using in-house data if available.

Who Should Attend: Geologists, Geophysicists, and Log and/or Core Analysts, Exploration & Production Managers, and Reservoir Engineers

About the Course:

Log analysis remains a vital component to many facets of the petroleum industry, from quantification of hydrocarbon reserves, developmental strategies, to real-time decision making for reservoir navigation. This 5 day course addresses the fundamental tenets of log analysis and its role in petrophysics and formation evaluation, using integrative perspective of multiple datasets, including geological, geophysical, logging and core data. You will learn the latest logging technologies and analyses to understand better petrophysical analysis, formation evaluation, and reservoir characterization. Pros & cons of key log types will be addressed, with emphasis on need for integrative studies and selection of tool combinations to resolve key issues. You will learn quick-look qualitative techniques as well as quantitative aspects such as volume of shale/clay, porosity, permeability, and water saturation determinations. Significant worldwide case histories are included, as well as several exercises designed to provide hands-on experience.

Course Topics:

• Welcome and Introduction – Discussion of the “need” for petrophysical analysis and formation evaluation, including integrated core and log analysis with worldwide case examples, illustrating their importance to hydrocarbon exploration and production.
• Rock and Fluid Properties – Classification and identification of clastic and chemical sedimentary rocks; Impact of weathering, burial, and lithification on sedimentary rocks; Cement types and origin; Porosity and permeability; Impact of grain arrangements, matrix materials, and fluid types; Water saturation determination (basic Archie analysis and complex modifications); Pressure analysis.
  • Well correlation (exercise).
  • Flow anisotropy and well placement (exercise).
• Data Types and Integration – Mud logging; Core acquisition and interpretation; Formation fluid testing; Wireline and LWD logging and imaging; Seismic and other geophysical techniques; Analogue studies.
  • Integrated well and core analysis (exercise)
  • Well data and seismic interpretation (exercise)
• Nuclear Log Analysis – Gamma ray log analysis, including spectral GR; Volume of shale (Vsh) analysis (exercise); Density log analysis, including bulk density calculation; Photoelectric effect log analysis; Neutron porosity log analysis; Lithology/porosity determination; Neutron capture spectroscopy.
  • Shale volume analysis using gamma ray and neutron/density (exercise)
  • Lithology/porosity determination (exercise)
• Resistivity Log Analysis and Water Saturation – Resistivity log types (esp. induction, lateralog, propagation resistivity); Invasion profile (microresistivity and array resistivity); Water saturation (Sw) models and determination; Calculation of Archie parameters; Resistivity anisotropy and laminated sequences; Azimuthal resistivity and reservoir navigation.
  • Water saturation (Sw) determination (exercise)
  • Determination of “n” parameter (exercise)
  • Clay conductivity and Sw (exercise)
  • Laminated sequences (exercise)
• Spontaneous Potential Log Analysis – Basic concepts and theory; Shale effect; Hydrocarbon response; Bed thickness effect; Invasion effects; Correlation and sedimentologic analysis; Interpretation examples.
  • Integrated Rw analysis (exercise)
• Acoustic Log Analysis – Compressional, shear, and Stoneley waves; Mode conversion; Acoustic porosity; Vp/Vs ratio; Synthetic seismic.
  • Porosity and bulk volume hydrocarbons (exercise)
• Nuclear Magnetic Resonance Log Analysis – NMR principles; hydrocarbon and water typing; NMR permeability.
  • Hydrocarbon and water typing (exercise)
• Azimuthal (Image) Log Analysis – Introduction to image log analysis; Wireline electric and acoustic images; LWD gamma ray, resistivity, acoustic, density, and photoelectric effect image logs; Log presentation and visualization; dip analysis; Role of images in structural/stratigraphic analysis, wellbore stability, reservoir navigation, azimuthal petrophysics, etc.
  • Dip determination (exercise)
  • Reservoir navigation (exercise)
• Integrative Analysis of Multiple Log Types – Cross-plotting porosity log types; Tri-porosity analysis; Water saturation and water cut determination; Pickett crossplot; Hingle crossplot; Probabilistic petrophysics.
  • Pickett crossplot (exercise)
• Formation Test and Pressure – Wireline and LWD formation testers; Pressure determination and application; Mobility and permeability; Sample collection and analysis; Fluid gradient analysis.
  • Fluid gradient analysis (exercise)
• Log Analysis of Unconventional Reservoirs – Laminated sequences; Oil and gas shales; Coal bed methane; Fractured basement.
  • Laminated sequence analysis (exercise)
  • Reservoir navigation in an oil shale (exercise)
• Quality Assurance/Quality Control – Review of common log issues during acquisition and problems; Cross-check comparison to other log and data types
  • QA/QC (exercise)
• Summary and Concluding Remarks – The present state and future role of petrophysical analysis and formation analysis; Final Q&A session.