N362 Petrophysics for Low Resistivity, Low Contrast Reservoirs
N362 Petrophysics for Low Resistivity, Low Contrast Reservoirs
This intermediate level practical petrophysics course will provide a proven methodology to identify and evaluate hydrocarbon reservoirs with a particular emphasis on Low Resistivity, Low Contrast (LRLC) pays. Methods to evaluate LRLC pay from both old log suites and the newer generation logging tools will be discussed. Reservoir characterization procedures for creating saturation height models on heterogeneous reservoirs from capillary pressure data will be illustrated with examples.
A five-day course consisting of a mixture of classroom lectures, spreadsheet calculations and log-based interpretation exercises. Lectures are interspersed with practical exercises (spreadsheet and PC-based interpretation software). Participants are encouraged to bring their own non-proprietary examples for end-of the-day group discussion/evaluation. Computers will be provided. The ratio of classroom to computer time is approximately 70/30.
Participants will learn to:
This is an integrated practical petrophysics course and will provide a proven methodology to identify and evaluate LRLC pays as seen in modern wells or as potential bypassed pays in old wells. Topics covered include: physical rock properties, shaly sand analysis, causes of low resistivity pay, evaluation of thinly laminated sand-shale reservoirs, nuclear magnetic resonance interpretation, capillary pressure and saturation height functions.
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.
The course covers:
Petrophysical Properties: Estimation and Interpretation (Logs)
Interpretation principles and workflows; Determination of Rw and Pickett plots, Archie exponents including anomalies, influence of wettability; Archie saturation; Saturationheight
Shaly Sand Analysis
Clay properties, volume of shale from logs; Effective and Total Porosity; Vsh, Double Layer (CEC) and Normalized (Juhasz) models for shaly sand interpretation.
Identifying Low Resistivity Pay from Conventional Log Suites
Tool resolution and responses. Mudlogging specifi cations. Core acquisition. Case studies from Gulf of Mexico.
Geologic Causes of Low Resistivity Pay
Non-Archie type reservoirs. Laminated sand/shale sequences, fresh formation waters, conductive minerals, silt and lower very fi ne sized grains, internal and superfi cial (clay
Shale Distribution in Clastic Reservoirs and Resistivity Anisotropy
Laminar, Dispersed and Structural Shale/Porosity Models, Thomas-Steiber Crossplots, net-to-gross in thin bedded environments, scaler vs. tensor measurements, multicomponent induction tools, interpretation methods.
Theory and Interpretation of Magnetic Resonance (NMR) Data
Measurement principles, porosity and saturation methods and limitations, pore size distribution and permeability models (Coates and SDR), fl uid identifi cation, thin bed
response, T2 measurement on cores, challenges with carbonates.
Using Capillary Pressure Data for Reservoir Models
Air-Hg, Centrifuge and Porous Plate Core Methods, converting lab data to reservoir conditions, Leverett-J cap pressure models, saturation-height models, FWL-OWC
Principles of Dielectric and Spectroscopy Logging
The course targets geoscientists and engineers with four or more years of industry experience who work with petrophysicists in regional evaluations, prospect generation and development studies, as well as petrophysicists with two or more years of experience seeking to enhance their interpretation skills. A major aspect of the course is discussion of petrophysical concepts and how these can be applied.
Participants should have a basic understanding of core properties, logging measurements and 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).
For more advanced treatment of petrophysical topics, consider N314 (Advanced Petrophysics Topics in Conventional Reservoir Evaluation), which builds on the material presented in N054. 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 N266 (Stress and Geomechanical Analyses).
Click on a name to learn more about the instructor
David joined Shell Offshore in New Orleans, Louisiana as a petrophysicist where he had various assignments in production and exploration, covering all areas of the Gulf of Mexico. He worked for Pecten International, Shell’s global affiliate, in 1994, and focused on exploration in West Africa. In 1996, he moved to Shell’s South Texas Gas Asset team and worked on the development of Wilcox tight gas sands. From 1999 to 2011, David worked with Marathon Oil Corporation where he had exploration/operations assignments for Gulf of Mexico and Angola and a field development assignment for a Sirte Basin discovery in Libya. David retired from Marathon in 2011 and is now working as a consultant.
David has a broad range of interests within petrophysics, but specializes on the elastic properties of rocks and how seismic attributes can be used to explore for and develop hydrocarbon reservoirs. Other areas of interest are compaction and quartz cementation modeling of clastics for reservoir quality prediction. He has extensive experience in log and core data acquisition as well as reservoir characterization.
Affiliations and Accreditation
BSc California Polytechnic State University - Mechanical Engineering
Society of Petrophysicists and Well Log Analysts
Society of Petroleum Engineers
American Association of Petroleum Geologists
N054: Intermediate Petrophysics for Conventional Reservoirs
N187: Low Resistivity Low Contrast Pay
N314: Advanced Petrophysics for Conventional Reservoirs
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