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EAPG/AAPG Special Conference on Chalk
- Conference date: 07 Sep 1994 - 09 Sep 1994
- Location: Copenhagen, Denmark
- ISBN: 978-94-6282-130-9
- Published: 09 September 1994
21 - 36 of 36 results
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Imaging immiscible two phase flow in low permeability chalk - Emphasis on recovery mechanisms and scaling
Authors A. Graue and B. G. ViksundA nuclear tracer imaging technique, ref. 1,2, is used to study in-situ local saturation developments
in spontaneous imbibition and waterflood experiments in chalk. Due to lack of reservoir material
outcrop chalk from the Dania outcrop near Älborg, Denmark, has been used.
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The East Hod Chalks - A new play or played out?
Authors R. D‘Angelo, M. Brandal, K. Rorvik, N. Gravdal, A. Alasker and S. CampbellEast Hod Field is one of two small oil accumulations located in Block 2/11, in the Central Trough
of the Norwegian North Sea. Although exploratory drilling was initiated in 1969, the East Hod
discovery weIl, 2/11-3a, was not drilled until 1977. Disappointing appraisal and delineation drilling
merely confirmed that the Hod Fields with a combined recoverable reserve of 25 mmstb. oil
equivalent, were of marginal economic value.
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Shallow upper Cretaceous Niobrara Gas Fields in the Eastern Denver Basin, Colorado, USA
More LessThe discovery of gas from the Cretaceous Niobrara chalk in
eastern Colorado's Yuma County was made by a local rancher in
about 1919. A weIl drilled with cable tools in what was to become
the Beecher Island field was completed for a reported flow of
2,000 MCFGPD.
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Porosity modelling of Danish chalk
Authors O. Nykjær and M. R. ØdumPorosity models have been generated for a number of Danish North
Sea chalk fields in order to improve the porosity mapping for
resource evaluation and reservoir simulation models in conjunction
with field development planning.
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The regional compaction pattern for the North Sea Chalk Group estimated from a normal velocity-depth trend
By P. JapsenThe Late Cretaceous-Danian Chalk Group is buried at depths varying from 0 to more than 3 km in the
North Sea Basin. Nature has thus conducted a dramatic experiment that allows us to study the effect of this
large depth variation on the seismic velocity and hence on the compaction of the chalk.
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A neural network application in integrated biostratigraphy of the Norwegian Sector, North Sea
Authors J. Yang-Logan, J. M. Hornell and C. R. YoungA neural network developed at Phillips Petroleum Company helps to characterize chalk
reservoirs to support chalk exploration, production, and modeling. The neural network is trained
trom samples for which fossil counts, age, zonation, paleoenvironment, biofacies, and mode of
deposition have already heen determined. The neural network training is used to identify
inconsistencies and possible finer zonations for the training examples. The trained neural network
is used to make determinations for new weIl biostratigraphic data.
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Synchronous variations in nannofossils assemblages and petrophysical parameters of North Sea chalks
Authors C. R. Young and E. A. SpinlerThe correlation between the ratio of reworked nannoplankton / total
nannoplankton population and chalk porosity has been routinely documented, in North
Sea wells, by Phillips biostratigraphers since the early 1980's.
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Well inflow phenomena in chalk gas condensate reservoirs - Effect of fluid sampling
Authors H. F. Fabricius and J. ReffstrupFluid flow and thermodynamic processes in saturated gas condensate reservoirs is complicated because
the composition of the saturated gas flowing to the weIl in the reservoir is altered during the production.
The pressure draw down at the well will cause heavy components to drop out of solution. When producing
from low permeability reservoirs as the chalk reservoirs in the Danish sector of the North Sea,
thermodynamic processes at the weIl are especially pronounced, because of the large pressure draw down
required to maintain production.
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A multidisciplinary approach to reservoir subdivision
Authors L. Kristensen, T. Dons, K. Maver and P. SchiølerCorrelation of wireline log data from North Sea chalk reservoirs is frequently hampered by
rather subtle log patterns in the chalk section. The present study deals with a correlation
technique based on an integration of biostratigraphic dating, seismic interpretation and
wireline log correlation.
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Porosity, permeability and specific surface of chalk from the Gorm Field, Danish North Sea
Authors J. Mortensen and I. LindThe Gorm Field of the Danish North Sea is an oil field with a reservoir In Danian and
Maastrichtian chalk. Core porosity and permeability data show that the chalk can be divided
into intervals with different relations between porosity and permeability.
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Chalk lithofacies, fractures, petrophysics and paleontology - An interactive study of chalk reservoirs
Authors W. T. Siemers, C. D. Caldwell, H. E. Farrel, C. R. Young, J. Yang-Logan and J. J. HowardInterpretation and integration of multidisciplinary data sets are essential for a better
interpretation of the internal geometry and architecture of the North Sea chalk reservoirs to better
support chalk exploration, production, and subsidence modeling.
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The mechanics of time-dependant strain in high porosity North Sea chalk
By D. W. RhettThe Ekofisk Field is a giant oil and gas field located in the southern region of the
Norwegian Sector of the North Sea. Since the Field went on production in 1971 it has produced
more than 1 boe.
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Nuclear magnetic resonance measurements of wettability and fluid saturations in chalk
By J. J. HowardThe surface-sensitive nature of proton NuclearMagnetic Resonance (NMR) relaxation makes it
an ideal probe to determine changes in wettability and fluid saturations of both experimentally altered
outcrop chalk and preserved-state reservoir chalk. The transformation of standard
NMR inversion-recovery data into a distribution of relaxation times clearly indicates the effect
of altering original wettability by significant shifts in the populations of relaxation times
observed in samples saturated with either water or hydrocarbon phases. Population densities
for the relaxation time components associated with both fluids correlate quantitatively with more
traditional volume displacement measures of fluid saturation.
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Modelling of fracture systems and fluid flow from analogue field studies
More LessPredicting fluid transport and mechanical properties of fractured formations is difficult because
of the complex spatial, geometrical and mechanical properties of three-dimensional fracture
networks, all of which must be inferred from well bore data or geophysical surveys.
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Fault patterns in the Eldfisk Field, central North Sea
Authors E. Rykkelid, A. Fritsen, P. Henriksen, D. C. Kitson, B. O. Korsfur and M. MartinesThe productivity of oil fields in the Central Graben depends on
an open fracture network: which enhances the effective
permeability of the chalk reservoirs.
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Chalks and chalk reservoirs of Tunisia with specific reference to the fractured reservoir of Sidi el Kilani
Authors A. B. Brahim and R. T. J. MoodyChalks and chalky limestones are recorded from the Upper Cretaceous and Lower Eocene of
Tunisia. The Cretaceous chalks are referred to the Abiod Formation and are of Campanian-
Lower Maastrichtian age (Figure 1).
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