Geophysical logs are a
primary means for interpretation of sedimentology and stratigraphy of subsurface
aquifers and reservoirs. This contribution by Farrell et al. illustrates
the techniques and application of a process-based method of graphic logging and
stratigraphic interpretation, independent from composition, cementation, and
geologic environment. The utility of this texturally-based classification of
clastic sediment is evidenced by four examples of shelf to shoreface
successions, including steps of identifying rock units (facies) independent of
composition, and interpreting environments, facies associations, boundaries and
systems tracts. In these successions, gamma logs indicate grain size and spikes
in radiation are associated with coarse lags at sequence boundaries, not high
mud content. This process-based technique, interpreted to integrate facies
analysis and sequence stratigraphy, should be broadly applicable to capturing
and interpreting heterogeneity in reservoir or aquifer quality in subsurface
systems.
Graphic logging for interpreting process-generated stratigraphic sequences and aquifer/reservoir potential: with analog shelf to shoreface examples from the Atlantic Coastal Plain Province, U.S.A. by Kathleen M. Farrell, W. Burleigh
Harris, David J. Mallinson, Stephen J. Culver, Stanley
R. Riggs, John F. Wehmiller, Jessica Pierson Moore, Jean
M. Self-Trail, and Jeff C. Lautier
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