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The programme is designed to familiarise geologists, geophysicists, engineers and all
other personnel involved in using log, core and test data to evaluate the commercial
potential of a reservoir. The participants will take an active part in going through
the relative importance of geological, geophysical and engineering parameters and
their inter-relationships. Emphasis will be placed on log interpretation in shaly
sands, although other types of reservoirs will also be included. Interpretation
techniques will be discussed that can be used for the evaluation of older suites of
logs. Guided hands-on evaluation is part of the course. The participants will be
guided to applying state-of-the-art technology for the interpretation of modern
suites of logs.
On completion of the course, the participants will know how to:
- Evaluate old and recent sets of well logs.
- Select the most cost-effective suite of logs to be requested for a well.
- Integrate log, core and test data to make a valid evaluation of a reservoir.
- Arrive at a well-balanced judgment about a reservoir’s prospectivity.
- Present a report based on which management decisions can be based.
Contents
Petrophysical measurements and their significance – Borehole environment.
Review of the fundamentals of petrophysics. The acquisition of petrophysical data.
The importance of scale factor. Data quality control and data integration.
Presenting petrophysical data.
Basic well log interpretation – Well site log evaluation. Detailed log interpretation.
The importance of water salinity chemical composition. The SP curve and its major
applications. The measurement of natural gamma rays. The spectralog. Resistivity
responses from well logs.
Detailed well log interpretation – Porosity responses from well logs. The
interpretation and integration of core data. The integration of test data. The
determination of lithology and depositional environment. Shaly sand analysis and
evaluation in other types of reservoirs. The determination of fluid saturations.
Potential reservoirs – Irreducible water saturation. The estimation of
permeabilities. Initial water cut determination. Moveable hydrocarbon studies. The
effect of changes in grain size, sorting and hydrocarbon type.
Hands-on work with suites of logs – Case studies using log, core and test data
presented by the participants or case studies prepared by the course presenter..
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