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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
Sequence
-stratigraphic Study of Mudstone Heterogeneity: A Combined Petrographic/Wireline
Log
Investigation of Upper Jurassic Mudstones from the North Sea (U.K.)
from:Well
Logs
Chapter 10
A Sequence
-stratigraphic Study of Mudstone Heterogeneity:
A Combined Petrographic/Wireline Log
Investigation of
Upper Jurassic Mudstones from the North Sea (U.K.)
Joe H. S. Macquaker
Department of Earth Sciences, University of Manchester
Manchester, U.K.
Clive R. Jones
Exxon Production Research
Houston, Texas, U.S.A.
ABSTRACT
log
signatures (gamma-ray, neutron-porosity, and density logs).
The data demonstrate that in these relatively monotonous, mudstone-dominated successions:
(1) mudstone lithofacies vary greatly, particularly with respect to their detrital
component; (2) individual mudstone lithofacies have distinctive electrofacies; (3) there
are systematic fining- and coarsening-upward grain-size trends on a 3- to 10-m scale; (4)
there were significant breaks in sediment accumulation a short distance above or below
where the stacking patterns change; and (5) mudstone successions such as these, whose
internal variability is usually interpreted in terms of changing bottom-water oxygen
concentrations and surface productivity (primary organic productivity that occurs in the
surface layers of the sea), should also be considered in terms of varying rates of local
siliciclastic sediment supply.
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