N054 Skilled Petrophysical Methods for Conventional Reservoirs

Course Facts

Course Code:
N054
Duration:
5 days
Type:
Classroom
CEU:
4.0 Continuing Education Units
PDH:
40 Professional Development Hours
Certificate:
Certificate Issued Upon Completion

Summary

Business Impact: Application of the learnings of this course will empower participants to better understand reserve estimation and reservoir characterization of conventional reservoirs.

This intermediate level petrophysics course explains the physical properties of rocks and their constituent fluids, how their properties are measured and how this information is used in reserve estimation and reservoir characterization of conventional reservoirs. Particular emphasis is given to the interactions between rock and fluid volumes which are explained and then illustrated with real examples. The course explores some of the newer generation tools and methods used in formation evaluation. The class consists of both lectures and exercises which are demonstrated with petrophysical software.

Duration and Training Method

This is a three-day course consisting of a mixture of classroom lectures, short exercise-based discussions, log based interpretation exercises. Computers will be provided. The ratio of classroom to computer time is approximately 70/30.

Participants will learn to:

  1. Evaluate the petrophysical properties of conventional reservoirs and the fluids contained within them.
  2. Evaluate through logs and core the key petrophysical properties such as lithology, porosity, Archie parameters, water saturation, permeability and net to gross.
  3. Generate a comprehensive petrophysical evaluation of a drilled section using an appropriate workflow to integrate available petrophysical data from logs and core.
  4. Assess the different modes of shale distribution, estimate shale volume from logs, appraise the different shaly sand interpretation models and understand the difference between effective and total porosity. 
  5. Estimate hydrocarbon reserves in a thinly bedded sand/shale sequence using industry crossplot methods and resistivity anisotropy principles. 
  6. Judge the advantages and limitations of nuclear magnetic resonance measurements for porosity, saturation and permeability. 
  7. Develop a permeability model from nuclear magnetic resonance data by calibrating industry relationships to core data.
  8. Assess the different rock typing methods and develop a saturation-height model of a heterogeneous reservoir using capillary pressure data and J-functions.
  9. Consider the primary causes of Low Resistivity Pay and recommend the appropriate tools and measurements for evaluation. 


This is an integrated practical petrophysics course, not just another log interpretation session.Topics covered include: physical rock properties, fluid distribution, capillary pressure, log measurements and interpretation, rock typing for reservoir characterization, Low Resistivity Pay. This course does not consider unconventional reservoirs.

The application of petrophysical analysis to subsurface projects will be emphasized, and the value of this approach will be illustrated with case studies and exercises. Participants will be taught how petrophysical tools measure parameters related to both lithology and fluids, highlighting the strengths and pitfalls of petrophysical measurements and interpretation.

The course covers:

Introduction

  • What is petrophysics? The role of the Petrophysicist.
Petrophysical Properties: Definitions and Controls
  • Definition of rock physical properties ( porosity, permeability, saturation, capillary pressure, relative permeability), and consideration of their measurement.
Petrophysical Properties: Estimation and Interpretation (Logs)

  • Interpretation principles and workflows: determination of lithology and matrix identification from crossplots, porosity from nuclear and acoustic logs, determination of water resistivity (Rw) and Picket plots, Archie exponents, water saturation.

Shaly Sands and Thin Beds

  • Shale distribution and clay types.  Volume of shale estimation from logs. Effective and Total Porosity. Shaly sand models (Vsh, cation exchange capacity, Juhasz)
  • Thomas Stieber crossplot methods, multicomponent induction tools and resistivity anisotropy. 

Nuclear Magnetic Resonance (NMR) measurements

  • Tool theory, T2 principles and measurements
  • Porosity, saturation and permeability from NMR measurements.

Permeability and Rock Typing

  • Porosity-permeability crossplot interpretation from quantile curves.
  • Industry rock typing methods (Flow zones, Thomeer, Winland R35, J-Functions)

Low Resistivity, Low Contrast Pay (LRLC)

  • Definitions and Causes of Low Resistivity Pay
  • LRLC examples from Gulf of Mexico and Mid Continent US

Who should attend

The course targets geoscientists and engineers with 4 or more years of industry experience who work with petrophysicists in regional evaluations, prospect generation and development studies, as well as petrophysicists with 1 to 2 years of experience seeking to enhance their interpretation skills.

Prerequisites and linking courses

Prerequisites - Participants should have a basic understanding of petrophysical evaluation, as presented in N083 (Introduction to Petrophysics and Formulation Evaluation), N121 (Modern Petrophysical Well Log Interpretation) or N003 (Geological Interpretation of Well Logs), as well as practical experience working with well logs.

Linking petrophysics courses include N187 (Low Resistivity Low Contrast Pay, US only), N267 (Petrophysics for Shale Gas, US only) and the field course N030 (Rocks and Fluids: Practical Petrophysics, Isle of Wight, UK)

Related courses at Basic Application Competence Level are N004 (The Essentials of Rock Physics for Seismic Amplitude Interpretation) and N013 (Overpressure in Petroleum Systems and Geopressure Prediction) and at Skilled Application Competence Level courses N032 (Professional Level Rock Physics for Seismic Amplitude Interpretation) and N411 ( Fractures, Stress and Geomechanics).

Click on a name to learn more about the instructor

David Eickhoff

Related Subjects

Great course and instructor. Good amount of hands-on exercises and did a good job of explaining what we were doing and why we were doing it. Definitely helped solidify my understanding of petrophysics.