DVD
of digital maps and pre-drift reconstruction using microplates.
This study consists of a series of digital geological
and geophysical maps of the Central Atlantic. They can be
used as a basis for posting information relevant to regional
hydrocarbon exploration, or as predictive tools for deep water
and other frontier areas. The maps improve regional understanding
of the Central Atlantic geology, especially where there is
little information currently available on one part of the
margin, but more data available on the opposing conjugate
margin, or in the adjacent basin on the same margin.
The digital maps are being continually updated and now include
350 sections and 250 wells along the Atlantic margins which are hot linked into the Arcview project.
| |
|
Digital
Format
The maps combine all of the geologically relevant data
in a GIS format, which has been digitised in Arcview.
The digitised layered data can be brought into GIS database
systems such as Geoquest, Landmark, Geographix, Satlegger,
ER Mapper and other systems as flat ASCII files.
Fitting procedure
A Lambert conic projection was chosen to minimise distortion.
Separate projections were used for each continental plate
with the central meridian and latitude placed over the
centre of each individual map. This further minimises
the distortion, enabling a better geometric fit between
the continental margins.
A new approach to fitting the continents has been employed
by identifying internal deformation zones, which moved
during, or after Central Atlantic break-up. Zip zones
are identified as red tracks on the maps. These zip zones
can be strike-slip basement shears, extensional rift basins,
fold and thrust belts, or dyke swarms. They are not necessarily
real geological structures, for instance a zip line would
be drawn along the central axis of an extensional rift.
These cumulative movements of microplates add up several
hundred kilometres. |
The accompanying report summarises the hydrocarbon
potential of all the basins along the Central Atlantic
Margins. A series of play fairway maps summarising source,
reservoir, maturity and seal along the NW African margin
highlight the remaining potential. A sereis of detailed
stratigraphic coumns has been compiled for all of the basins
where source, seal and reservoir horizons are summarised. All
the diagrams are available in PDF format and in a hard-bound
volume.
Our principal fitting procedure was to remove the Mesozoic
to Recent intra-plate movement in order to correlate structures
and geology across the Central Atlantic rift at the end of
late Triassic-early Jurassic rifting. The detailed fit has
then been achieved by starting at the points along the margins
where the best correlations of fracture zones across the Central
Atlantic occur (accuracy = + 50 km).
Lists of figures: 1.1
- 5.5 / 6.1 - 7.21
/ 8.1 - 13.4 /
14.1 - 16.25
Central Atlantic Margins
Introduction
Contents
Examples
Our
Clients / Multiclient
Reports
|
