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Petrophysical Evaluation of Unconventional Reservoirs (PPH43)

    Description

    This comprehensive course explores how the physical and chemical nature of mudstones and tight formations constrains our petrophysical approach, and how core, log, image, and laboratory data can be integrated to develop appropriate evaluation workflows. Unconventional reservoirs are typically dual porosity and dual permeability systems, requiring advanced modelling techniques including multi-mineral stochastic inversion to handle complex lithologies and quantify uncertainties.
    The analysis methodologies taught can be applied to pilot wells for identifying favourable horizontal drilling zones, and to horizontal wells for optimising completion intervals and identifying flow units.

    Course Level: Skill
    Duration: 4 days

    Designed for you, if you are...

    • A geologist, geophysicist, petrophysicist or engineer involved in the petrophysical evaluation of shale and tight reservoirs
    • A professional in the oil and gas industry seeking to develop intermediate-level formation evaluation skills for unconventional reservoirs

    How we build your confidence

    • This course employs proven adult learning techniques ensuring maximum understanding and retention.
    • Sessions include visual, auditory, and kinesthetic elements covering different learning modalities.
    • Daily sessions are highly interactive and participatory, featuring regular discussions of real-world applications and case studies from major unconventional plays worldwide. This involves regular discussion of the applications, as well as practical exercises that will be solved manually and/or using Microsoft Excel

    The benefits from attending

    By the end of the course you will be confident to:
    • Analyse fluid distribution in unconventional dual-porosity reservoirs
    • Determine how maturation affects pore distribution and connate water salinity
    • Distinguish geologic environments that require special logging tools
    • Develop special core analysis approaches to calibrate or validate petrophysical models
    • Apply multi-mineral stochastic inversion techniques to determine complex mineralogy with uncertainty quantification
    • Integrate probabilistic modelling approaches with deterministic methods for comprehensive reservoir characterisation
    • Evaluate total organic carbon (TOC) using multiple calibrated approaches
    • Accurately quantify clay-bound water and free water volumes
    • Select the most appropriate interpretation approach for a specific reservoir

    Topics

    The Physics of Log Measurements
    • Introduction to well logging
    • Physical principles and theories behind log measurements
    • Basic and advanced logging tools and their applications in unconventional reservoirs

    Log Normalisation, QC, and Measurement Error
    • Normalisation techniques for well logs
    • Quality control procedures for log data
    • Understanding measurement errors and their impact on resource evaluation

    Mineralogy Determination from Logs
    • Log responses related to mineralogy
    • Interpretation methods for mineralogical analysis from logs
    • Multimineral stochastic interpretation
    • Quantitative mineralogy estimation using log and core data

    Clay Responses and Clay Bound Water
    • Clay mineral identification from well logs
    • Clay responses in different formations, clay evaluation tools for unconventional reservoirs
    • Clay-bound water estimation from log and core data

    TOC Models
    • Introduction to Total Organic Carbon (TOC)
    • TOC estimation methods using well logs and various core measurements
    • Application of TOC models
    • Porosity in unconventional reservoirs

    Porosity Determination
    • Porosity determination with several logging tools, what do they measure?
    • Estimating secondary porosity with well logs
    • Different porosity models, their assumptions, and NMR log and core measurements

    Fluid Saturation Models and Measurements
    • Introduction to fluid saturation and its significance
    • Interpretation methods for fluid saturation using standard and specialty well logs
    • Unconventional reservoir saturation models

    Permeability from Core, Logs and Formation Tests
    • Core analysis techniques for permeability determination
    • Log-based permeability estimation models
    • Permeability from formation tests
    • Integration of multiple measurements for dual permeability evaluation

    Rock Mechanics
    • Introduction to rock mechanics and its importance in field development
    • Logging tools for rock mechanical analysis
    • Interpretation of rock mechanical properties and its different applications in vertical and horizontal wells


    Exercises
    The course includes several exercises distributed during the different topics, to help complement and better assimilate the theoretical concepts, such as:
    • Determine key petrophysical properties for reservoir characterisation, e.g., Kerogen Volume, PHIT, VSHALE, VCBW, PHIE
    • Calibrate logs by determining PHIT and PHIE at specific depths using logs and core analysis information
    • Reconstruct wireline logs from XRD, lab data and Pyrolysis information
    • Perform a multimineral stochastic analysis with wireline logs to determine reservoir mineralogy
    • Calculate water saturation and effective porosity under various conditions using several saturation equations, select the most appropriate for the reservoir
    • Do a complete well evaluation in a complex lithology reservoir (group exercise)


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