Well Logging and Formation Evaluation
Covering all aspects of well logging and formation evaluation, this comprehensive guide offers practical techniques that will be valuable to petrophysicists and engineers in their day-to-day jobs.
TABLE OF CONTENTS Well Logging and Formation Evaluation
Chapter 3: Full Interpretation
OVERVIEW
Once the final data and prints have been received from the logging contractor, the digital data should be stored within a corporate database. Normally at this point the petrophysicist will do a full interpretation, which might be revised as further core analysis or information from offset wells becomes available.
In some cases the quicklook Archie model might be completely set aside in favor of a more advanced model, as described later in this book. In other cases it is sufficient merely to refine the conventional Archie interpretation. In this chapter the ways the Archie model may be refined will be discussed.
3.1 NET SAND DEFINITION
If core data have been acquired, it is essential that the petrophysicist pay a visit to the core shed at the earliest opportunity to inspect the slabbed core. This will provide a check that there are not anomalous zones that have been wrongly allocated to reservoir or nonreservoir status in the interpretation. Where reservoir can be easily identified, one should make measurements of the core to ascertain the exact net sand footage that can be checked against the calculations made on the logs.
In order to match the net sand footage calculated from the logs with that seen on the core, the shale volume ( V sh) cutoff may be varied. Core photographs will be taken under both normal and UV light, which can also assist in the determination of net reservoir. Once the conventional core analyses have been completed, one will have...
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