Mem Moreover, a High Resolution Biostratigraphy summary including micropaleontology, nannopaleontology and palynology distributions relating to each offshore basin is needed for sequences correlations and entire harmonization of the stratigraphic nomenclature of these offshore basins. Selon Pothin et al. The porosity may be related to diagenesis after being dessoluted. Le sommet est essentiellement argileux. By against certain layers are poorly penetrable and show the presence of fluid. Scanning electron microscopy allowed to highlight the depositional environment of the stone-line.
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Mem Moreover, a High Resolution Biostratigraphy summary including micropaleontology, nannopaleontology and palynology distributions relating to each offshore basin is needed for sequences correlations and entire harmonization of the stratigraphic nomenclature of these offshore basins. Selon Pothin et al. The porosity may be related to diagenesis after being dessoluted. Le sommet est essentiellement argileux. By against certain layers are poorly penetrable and show the presence of fluid.
Scanning electron microscopy allowed to highlight the depositional environment of the stone-line. The thickest deposits, and most of the oil and gas, occur in the westward thickening and deepening depocentre called the Peace River Embayment.
The sonic log has two phases in the marl and limestone interval. A Stratigraphic Nomenclature Comparison. Schlumberger — Log interpretation. Thus, the solid materials constituting stone-line observed in the superficial levels of the tertiary-quaternary sedimentary sequence of the east of the onshore sedimentary basin come from the disintegration of the subjacent sediment levels of the same litho logical nature. Exploration plays consist of stratigraphic and stratigraphic-structural combination traps, with reservoirs in aeolian, shoreline, tidal channel, and shallow marine sandstones, coquinas, and tidal flat and marine shelf carbonates.
Calcareous layers generally have a shorter time of wave propagation, suggesting that they are indurated, recrystallized and homogeneous. Expected potential in-place gas volumes nassin mature, immature and conceptual plays unencumbered by economic constraints total x m3, indicating that over 50 per cent of the total in-place resource remains to be discovered. The gamma ray log varies significantly in limestone phases reflecting the heterogeneity of deposits.
For the first time, a correlation of stratigraphic charts of each basins and a schematic cross section showing their lithostratigraphic units, especially the Cretaceous-Paleocene interval which is sedimenttaire, are proposed. Scientific Research An Academic Publisher. Based mainly on available lithological, biostratigraphic and paleoenvironmental data, this paper summarizes the stratigraphic succession of theses basins and attempts a comparison of these stratigraphic nomenclatures.
A PDF file should load here. The sonic log fluctuations in the limestone stage reflect the heterogeneity of deposits. International Journal of GeosciencesVol. Geological Survey of Canada, Bulletin, pages, https: Received 18 th June, ; Sedimentqire in revised form 19 th July, ; Accepted 24 th August, ; Published online 30 th September, This radioactivity recorded in clays would be linked to the low organic matter content and leaching reworked elements. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The stratigraphy of the Offshore Benin Basin was established later and considering lithological and paleontological similarities with formations of various southern Nigeria basins, the stratigraphic chart adopted for this basin was a mixed variant of various Southern Nigerian basins nomenclatures. The installation of these sediments was carried out in an oxidizing environment. Fluctuations result from long-term changes in submarine hydrothermal flow and may indicate significant sevimentaire in facies crystalline limestone, marl and clay.
Statistical analysis of the mature plays indicates that a total of 13 plays are likely to exist. Three of these plays are predicted to contain over one half of the remaining gas potential: Schlumberger Educational Service, Houston Texas: The limestone is fractured, so more porous than clay and marl.
Les couches argileuses ont une vitesse sonique faible. Through the gamma ray logs, it appears that the clay sedimdntaire have low radioactivity, which often progress to average values. In marls, relatively high propagation velocity implies that they are less penetrable as clays because of the presence of fluid.
To know the petrophysical characteristics associated with sedimentary facies gammay ray logs providing information on the natural radioactivity of sedimentary rocks and the sonic logs which document on facies and petrophysical variations rocks were studied. This publication supercedes Geological Survey of Canada; It reveals that two deposits phases occurred during the carbonate sedimentation.
Contribution de Sonatrach, Division Exploration: The Benin and Western Nigeria Offshore Basins, which are parts of an extensive basin called the Dahomey Benin Embayment, were formed during the Early Cretaceous under similar tectonic conditions and continental sedimentary environments.
Triassic strata belong to a platformal succession of mixed siliciclastic, carbonate, and evaporite sediments deposited along the western portions of the basin. In the marl phase, the acoustic wave velocity is almost constant, but in the limestone phase velocities fluctuate. Sur la palynoflore Maestrichtienne et Tertiaire du bassin sedimentaire littoral du Cameroun Natural gas resource potential of Triassic strata in the Western Canada Sedimentary Basin excluding the Foothills Belt was evaluated using a combination of geological play analysis and statistical estimation.
Statistical analysis of the ten established mature plays suggests they contain a sedimentaure potential of x m3. The first phase of sedimentation is at the origin of the deposit of the extra formational sediments and the second phase is responsible for the deposition of intraformational sediments. Analyse lithostratigraphique et comparaison avec le log gamma ray Chadelle, European Scientific JournalNov The petrographic correlative analyzes of the bsasin material in stone-line allowed to determine their origin.
There are more or less dolomitised layers alternating with more homogeneous chemical limestone benches, biogenic limestone debris of organisms and past clay.
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