Goodarzi, Fariborz (FG&Partners Ltd, 219 Hawkside Mews, NW, Calgary, Alberta, Canada, T3G 3J4) | Ardakani, Omid Haeri (Geological Survey of Canada - Calgary) | Pedersen, Per-Kent (Department of Geoscience, University of Calgary, Calgary, Alberta, Canada, T2N 1N4) | Sanei, Hamed (Geological Survey of Canada - Calgary, Department of Geoscience, University of Calgary, Calgary, Alberta, Canada, T2N 1N4)
Canada has vast oil shale resources (estimated at 180 billion barrels proved recoverable oil shale reserve) similar to the estimated Canadian oil reserve of 179 billion barrels. These deposits consist of various oil shale types deposited in terrestrial, lake, and marine environments. These Canadian oil shale deposits are assessed under auspices of Canada/Israel Industrial Research and Development Program and Geological Survey of Canada for their possible use for extraction of hydrocarbon. The organic rich oil shale deposit with thickness of 60m are suitable for this purpose. This paper reviews the oil shale deposits of Arctic Canada from Ordovician to Carboniferous age. Ordovician shale of Baffin Island, Southampton Island, and Akpatok Islands consist of organic lean, calcareous deposits with variable thickness.
Seismic intepreters already use the principles of sequence stratigraphy to help interpret the geometry and sedimentary facies of the sedimentary bodies seen on seismic data. Linking seismic interpretation to a well database containing information on bathymetry and lithology, by using ultra-rapid algorithms simulating sediment transport, can help the interpreter to rapidly test and modify the stratigraphic scenario inherently present in the geometry and nature of the surfaces that have been picked. This "on the fly" stratigraphic modelling should make seismic stratigraphic interpretation easier and simpler to perform.
Various image-processing techniques can also be of help to the interpreter, both in determining depositional environment from seismic textural analysis and in a more rapid identification of the key toplap, onlap, downlap and truncation surfaces present in the seismic data. Again, linking the textural information with the well database can lead to a better use of both types of data.
The above techniques have been applied to seismic and well data of the National Petroleum Reserve Alaska, as a structured workflow involving the construction of a detailed geomodel and time-to-depth conversion cube. For each of the sequences picked on the seismic, the direction and composition of the principal sources of clastic supply are determined, and paleobathymetrical maps are generated, all of which are coherent with the well data (interpreted lithology and depositional environment) and the picked thickness of the sequence on seismic. The interpreter can then choose to view the seismic data of the next sequence in Â« true stratigraphic position Â» by shearing to fit the modelled bathymetrical profile of the underlying sequence. He or she may also choose to review and reinterpret the well data or repick the seismic surfaces in the light of the realistic paleogeographical scenario generated by the stratigraphic modelling.
The aim of the present work was to test the application of algorithms designed to assist seismic interpretation for petroleum exploration by using the principles of forward stratigraphic basin modelling. We used a data set from the North Slope, Alaska which is freely available online from the United States Geological Survey (see below). The data to be fitted by the stratigraphic forward modelling included the thickness of stratigraphic intervals between markers picked on seismic data, the bathymetry and the lithological content of these interval identified in wells.
POTENTIAL PETROLEUM BASINS OF GREENLAND T. C. R. Pulvertaft, Senior Geologist, Geological Survey of Greenland. Abstract. Large sedimentary basins with petroleum potential are found along the periphery of Greenland, both onshore and offshore. Onshore basins: (1) The Franklinian Basin of North Greenland (80"-82"N), where oil source rocks were deposited in the outer shelf during the Early-Middle Cambrian and Early Silurian. (2) Post-Caledonian rift and thermal subsidence basins of East and Northeast Greenland (70"-76"N). Good lacustrine and marine source rocks for oil occur at five different levels in the Upper Palaeozoic and Jurassic, and there are several levels with reservoir lithologies. Play types involve both tilted fault blocks and strati- graphic traps. (3) Cretaceous-Tertiary basin of West Greenland (69"-72"N). A substantial live oil showing in vesicular Paleo- cene basalts has recently been discovered in this basin, proving that it has a potential for oil. Offshore basins: East Greenland (1) Northeast Greenland shelf (75"-80"N; ca. 125000 km'): Extrapolation from the adjacent onshore area, the northern North Sea, the Norwegian shelf, and the southwest Barents Sea suggests that this area has con- siderable petroleum potential. A seismic reconnaissance of this area has been initiated. (2) Liverpool Land basin (70"-72"N; ca. 13 500 km2): Up to more than 6 km of Tertiary Sediments unconform- ably overlying several km of block-faulted Upper Palaeozoic-Mesozoic Sediments. (3) Blosseville Kyst basin (68"-70"N; ca. 28000 km?): More than 6 km of Eocene-Recent Sediments overlying Late Paleocene-earliest Eocene basalts. West Greenland (1) Southern West Greenland (ca. 63"-68"N; ca. 90000 km3): Up to more than 4 km of Cretaceous Sediments in block-faulted structures, some of them very large, overlain by slightly faulted Palcocene and poorly struc- tured Eocene-Recent Sediments. Transpressional structures are superimposed on extensional structures in the west. Source rock intervals are interpreted near the base of a regional Cenomanian/Turonian- Campanian mudstone unit and within the Paleocene. (2) Northwest Greenland (73"-77"N; ca. 66 000 km2): Major, very thick (> 10 km) sedimentary basin@) with very large block-faulted structures. Anticipated age of sedimentary fill Cretaceous-Recent, with likelihood of older Sediments in places. The first seismic data from this area have recently been acquired. The poster will present graphic summaries of stratigraphy, structure, basin development, surce rock data and play types of each basin insofar as these are known and are not confidential, together with summaries of exploration history and current activities. In 1969 the Geological Survey of Greenland began petroleum-geological studies of the onshore sedimen- tary basins of Greenland, and in recent years these studies have been intensified while at the same time the Survey has acquired new seismic data offshore both central East and sou