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Architecture of fluvio-deltaic sandbodies: the Namurian of Co. Clare, Ireland, as an analogue for the Plio-Pleistocene of the Nile Delta

By Eleanor Jane Stirling

Abstract

Understanding and predicting the size, shape and internal architecture of sandbodies is of fundamental importance in hydrocarbon exploration. High quality hydrocarbon reservoirs are often formed in deltaic environments where there is a complex interplay between changes in relative sea level, sediment input and climate. When combined with the intrinsic sedimentary variability of deltas, this makes prediction of the internal facies distributions and architectures of deltaic sandbodies a challenging task. The aim of this thesis is to conduct a detailed qualitative and quantitative field study of fluvial and deltaic sandbody architecture and facies distribution, and to assess the usefulness of the data thus obtained in predicting the\ud architecture and sedimentary characteristics of reservoir sandstones in the subsurface.\ud \ud The El Wastani Formation of the Nile Delta, Egypt, has previously been identified as an interval of reservoir quality sandstones within the Plio-Pleistocene deltaic succession. Limited core data, and poor seismic imaging due to gas seepage effects, hindered past attempts to assess the internal architecture and facies of the sandbodies. Therefore it was considered appropriate to use an outcrop analogue to aid understanding of the El Wastani Formation reservoir characteristics. From a review of literature, the Upper Carboniferous fluvial and deltaic sandstones of the Central Clare Group, County Clare, western Ireland,\ud were found to be suitable analogues for the El Wastani Formation sandstones. Controls on the two sedimentary systems were similar; both were fluvial-dominated and wave-influenced, and both show evidence for fluctuating relative sea-level. Comparisons of facies observed in outcrop (Co. Clare) and interpreted from image logs (Nile Delta) show similar facies and sedimentary successions in the two systems, improving confidence in the choice of analogue.\ud \ud Fieldwork carried out on the Upper Carboniferous (Namurian) coastal outcrops of Co. Clare produced detailed measurements of facies distributions and bed geometries, which, together with sedimentary logs, palaeocurrent studies and outcrop-scale photomontages, enabled\ud interpretation and quantification of channel dimensions, internal architectures and stacking patterns. Based on these data, the Tullig Sandstone, a major sandbody within the Central Clare Group, is interpreted to be a low-sinuosity, braided fluvial system that flowed to the\ud north-northeast. This sandbody shows decreasing amounts of erosion and conglomeratic facies in both downstream and vertical directions, interpreted to reflect the combined effects of delta subsidence and sea-level rise over time, influencing the downstream reaches of the system first. The mean sand to non-sand ratio for the Tullig Sandstone is 97% by area, and connectivity of sandstone facies within this sandbody is 93%. In contrast, mouthbar sandbodies that were studied have a mean sand to non-sand ratio of 90%, and greatly reduced sandstone connectivity, at 65%. The data that characterise the field outcrops can be taken as\ud indicative of the probable characteristics of the El Wastani sandbodies.\ud \ud The data generated from the quantitative field studies were used to construct computer models of the outcrops, in order to see how well the modelling software was able to reproduce the outcrop architectures and facies distributions, and also to test the sensitivity of the models to different scales of data. One large-scale model was built to include all the Tullig Sandstone outcrops along the coastline, with a vertical resolution (cell height) of 1m. A second smaller model was constructed to cover just the Trusklieve outcrop, and was built using a vertical cell height of O.1m. Each model was designed to fit the sedimentary log data, and was conditioned to reflect the facies percentages and channel dimensions measured and calculated respectively from the outcrops. The results showed that although the larger modelling grid,\ud with lower vertical and horizontal data resolution, showed significant differences in finegrained facies distribution from the outcrops, it was reasonably successful at reproducing the channel shapes and stacking patterns seen in outcrop. In addition, the high sand to non-sand\ud ratio meant that sandstone connectivity was not reduced compared with either the outcrops or the small, high-resolution model. The small model was better at reproducing the geometries of beds of fine-grained facies, but lacked the ability to accurately simulate the channel architectures and stacking patterns.\u

Publisher: Earth Sciences (Leeds)
Year: 2003
OAI identifier: oai:etheses.whiterose.ac.uk:1398

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  1. 1992a. Discussion of: ''The Millstone Grit (Namurian) ofthe southern Pennines viewed in the light of eustatically controlled sequence stratigraphy" by
  2. 1992b. Sequence stratigraphy of the Upper Yeadonian of northern England.
  3. 1993.Interpreting the dimensions of ancient fluvial channel bars, channels, and channel belts from wireline-Iogs and cores.
  4. (1961). A mid-Carboniferous (Namurian) basin in parts of the counties of Limerick and Clare,
  5. (1994). A prototype procedure for stochastic modelling of facies tract distribution in shoreface reservoirs. In: Yarus,
  6. (1970). A quantitative model of climbing ripples and their crosslaminated deposits.
  7. (1977). A review of the braided river depositional environment.
  8. (1972). A theoretical and experimental study of climbing-ripple crosslamination, with a field application to the Uppsala esker.
  9. (1993). A theoretical study of fluvial sandstone body dimensions. In:
  10. (1993). Alluvial architecture in a sequence stratigraphic framework: a case history from the Upper Cretaceous of southern
  11. (1986). Alluvial Sediments. In:
  12. (1991). An integrated approach to exploration in the 90's: well log - seismic sequence stratigraphic analysis. Transactions of the Gulf Coast Association of Geological Societies.ยท
  13. (1972). An interpretation and analysis of recumbent folded deformed cross-bedding.
  14. (1989). Anatomy of an avulsion.
  15. (1991). Application of global sea-level and sequence-stratigraphic models in Southern Hemisphere Neogene strata from New Zealand.
  16. (1985). Architectural-element analysis: a new method of facies analysis applied to fluvial deposits.
  17. (1988). Architecture of the Castissent fluvial sheet sandstones, Eocene, South Pyrenees,
  18. (1996). Aspects of reservoir potential of the Miocene-Pliocene sequences in north Alexandria 266 and surrounding areas offshore Nile Delta, Egypt.
  19. (1978). Bed-form distribution and internal stratification of coarse-grained point bars, Upper Congaree River,
  20. (1996). BG TCM internal report.
  21. (1987). Brahmaputra River: channel migration and deposition.
  22. (1993). Braided Rivers: perspectives and problems.
  23. (1993). Braided stream and flood-plain deposition in a rapidly aggrading basin: the Escanilla formation, Spanish Pyrenees. In:
  24. (1930). Building of the Mississippi delta.
  25. (1987). Channel formation and migration by mass-flow processes in the Lower Carboniferous fluviatile Fell Sandstone Group, northeast England.
  26. (1991). Characterization of delta front sandstones from a fluvial-dominated delta system.
  27. (1987). Chronology of fluctuating sealevels since the Triassic.
  28. (1990). Classification of large-scale subaqueous bedforms; a new look at an old problem.
  29. (1986). Coarse-grained non-marine volcaniclastic sediment: tenninology and depositional process.
  30. (1998). Combining sequence stratigraphy, geostatistical simulations, and production data for modelling a fluvial reservoir in the Chaunoy field (Triassic,
  31. (1991). Construction of a reservoir model by integrating geological and engineering information; Bell Creek Field, a barrier/strandplain reservoir.
  32. (1989). Controls on internal structure and architecture of sandstone bodies within Upper Carboniferous fluvial-dominated deltas, County Clare,
  33. (1988). Controls on sedimentation in the Rough Rock Group. In: Besly,
  34. (1999). Correlation techniques, perforation strategies, and recovery factors: an integrated 3-D reservoir modelling study, Sirikit field,
  35. (1968). Current ripples.
  36. (1970). Deep channels, massive beds and turbidity current genesis in the Central Pennine Basin.
  37. (1977). Deep distributary channels and giant bedforms in the Upper Carboniferous of the Central Pennines, northern England.
  38. (1981). Deltaic coals of Ferron Sandstone Member ofthe Mancos Shale: predictive model for Cretaceous coal-bearing strata of the Western Interior.
  39. (1984). Deltaic morphology and sedimentology, with special reference to the Indus River delta.
  40. (1981). Deltas: processes and models of deposition for exploration.
  41. (1987). Depositional and syn-sedimentary deformation processes in Namurian deltaic sequences 0/ West County Clare, Ireland. Unpublished PhD thesis,
  42. (1975). Depositional environments as interpreted from primary sedimentary structures and stratification sequences.
  43. (1978). Depositional models in coal exploration and mine planning in the Appalachian region.
  44. (2001). Detailed internal architecture of a fluvial channel sandstone determined from outcrop, cores, and 3-D ground-penetrating radar: example from the middle Cretaceous Ferron Sandstone, east-central Utah.
  45. (1989). Detailed sedimentology and gamma-ray characteristics of a Namurian deltaic succession I: Sedimentology and facies analysis.
  46. (1985). Determination of widths of meander-belt sandstone reservoirs from vertical downhole data,
  47. (1999). Dimensions of paralic sandstone bodies.
  48. (1987). Discontinuous vertical penneability barriers: a challenge to engineers and geologists.
  49. (1992). Discussion of: ''The Millstone Grit (Namurian) of the southern Pennines viewed in the light of eustatically controlled sequence stratigraphy" by
  50. (1991). Early fill of the Western Irish Namurian Basin: a complex relationship between turbidites and deltas.
  51. (1971). Effluent expansion and interfacial mixing in the presence of a salt wedge, Mississippi River Delta.
  52. (1996). Egypt - Nile Delta and North Sinai Cenozoic tectonic evolutionary model: a proposal.
  53. (1998). Evolution and hydrocarbon occurrence in the Plio-Pleistocene succession ofthe Egyptian Mediterranean margin: examples from the Nile Delta basin.
  54. (1976). Evolution of Eocene-Miocene sedimentation patterns in northern Egypt.
  55. (1997). Facies and fluvial architecture of a high-energy braided river: the Upper Proterozoic Seglodden Member, Varanger Peninsula,
  56. (1998). Facies architecture and sedimentology of a meandering fluvial system: a Palaeogene example from the Weisselster Basin,
  57. (1989). Field guide to the Western Irish Namurian Basin. Sedimentary Research Associates.
  58. (1994). Field-based testing of high resolution sequence stratigraphic concepts; the Campanian Eagle Fonnation, Mesaverde Group, Bighorn basin, northwestern Wyoming,
  59. (1988). Flow, sediment transport and bedfonn dynamics over the transition from upper-stage plane beds: implications for the fonnation of planar laminae.
  60. (1983). Flume experiments on bedfonns and structures at the dune plane bed transition. In:
  61. (1983). Fluvial distributary channels in the Fletcher Bank Grit (Namurian R2b), at
  62. (1991). Fluvial facies model of the Ganga River sediments,
  63. (1982). Fluvial facies models and their
  64. (1978). Fluvial processes and facies sequences in the sandy braided South Saskatchewan River,
  65. (1973). Fluviatile fining-upwards cycles and the magnitude of palaeochannels.
  66. (1990). Framework for constructing clastic reservoir simulation models.
  67. (1994). Geochronometry and geochemistry of the European midCarboniferous boundary global stratotype proposal,
  68. (1994). Geomorphology and Quaternary History of the Lower Mississippi Valley. Mississippi River Commission,
  69. (1983). Gravel overpassing on humpback bars supplied with mixed sediment: examples from the Lower Old Red Sandstone,
  70. (1993). Ground penetrating radar: application to sandbody geometry and heterogeneity studies.
  71. (1978). Growth faults in Carboniferous of Western Ireland.
  72. (1996). Ha'py field: the result of Pliocene exploration in the Ras EI Barr concession, Nile Delta.
  73. (1991). Heterogeneity of Upper Cretaceous Gallup Sandstone regressive facies, Gallup sag,
  74. (1975). Hierarchical attributes and a unifying model of bed forms composed of cohesionless material and produced by shearing flow.
  75. (1994). High resolution sequence stratigraphy of an Upper Carboniferous basin-jill succession, County Clare, western Ireland. County Clare field guide.
  76. (1986). Holocene evolution of the northeastern comer of the Nile Delta.
  77. (1982). Hummocky stratification: significance of its variable bedding sequences.
  78. (1985). IEOC internal report,
  79. (2000). Integrated reservoir characterisation and uncertainty analysis using stochastic methods and streamline simulations. SPE 65178: paper prepared for presentation at the Society of Petroleum Engineers European Petroleum Conference,
  80. (1974). Interdistributary bay sequences and their genesis.
  81. (1993). Large fluvial systems: the Atane Fonnation, a fluvio-deltaic example from the Upper Cretaceous of central Greenland.
  82. (1976). Large scale ripples of the lower Wabash River.
  83. (1987). Late Quaternary stratigraphy and palaeogeography of the eastern Nile Delta,
  84. (1978). Lithofacies types and vertical profile models in braided river deposits: a summary.
  85. (1995). Magnetic crustal character in central Ireland.
  86. (1974). Mass movement of the Mississippi river delta sediments.
  87. (1983). Massive sandstone facies in the Hawkesbury Sandstone, a Triassic fluvial deposit near Sydney,
  88. (1972). Mechanics of sediment transport.
  89. (1999). Methodology for integrating analog geologic data in 3-d variogram modelling.
  90. (1986). Microorganisms, concretions and diagenetic cements. In: Sediments down-under: 12th international sedimentological congress; abstracts.
  91. (1985). Migration of glacial centres across Gondwana during the Palaeozoic era.
  92. (1988). Millstone Grit cyclicity revisited. In: Besly,
  93. (1990). Mini-permeameter-based study of permeability trends in channel sand bodies.
  94. (1964). Minor sedimentary structures in a prograding distributary.
  95. (1974). Mississippi River mouth processes: effluent dynamics and morphologic development.
  96. (1998). Modelling of fluvial reservoirs with object models.
  97. (1975). Modem river deltas: variability of processes and sandbodies.
  98. (2000). Morphological evolution and dynamics of a large, sand braid-bar,
  99. (1981). Morphology and dynamic sedimentology of the eastern Nile Delta shelf.
  100. (1995). Morphostructure, growth patterns, and tectonic control of the Rhone and Nile deep-sea fans: a comparison.
  101. (1998). Nile Delta hydrocarbon potentiality.
  102. (1989). Nile Delta: a review of depositional and geological history. In: Whateley, M.K.G. and Pickering, K.T. (eds) Deltas: sites and traps for fossil fuels.
  103. (1978). Nile Delta: nature and evolution of continental shelf sediments.
  104. (1976). Nile suspended load and its importance for Nile Delta morphology.
  105. (1986). Notes on stochastic shales; from outcrop to simulation model.
  106. (1994). Numerical facies modelling combining deterministic and stochastic methods.
  107. (2000). Object and pixel-based reservoir modelling of a braided fluvial reservoir.
  108. (1972). On the velocity distribution of the flow carrying sediment in suspension.
  109. (1985). Palaeochannel patterns inferred from alluvial deposits: a critical evaluation.
  110. (1973). Penneability-porosity patterns and variations in some Holocene sand bodies.
  111. (1984). Pennian-early Mesozoic tectonism and continental margin fonnation in Israel and its implications for the history of the eastern Mediterranean. In:
  112. (1936). Physiography of the lower Mississippi River Delta.
  113. (1998). Plio-Pleistocene clastic reservoirs of the offshore Nile Delta, Arab Republic of Egypt.
  114. (1967). Pliocene and Pleistocene deposits of the Nile Valley in Nubia and Upper Egypt.
  115. (1993). Predicting reservoir sandbody orientation from dipmeter data: the use of sedimentary dip profiles from outcrop studies. In:
  116. (1964). Primary current lineation in the Lower Old Red Sandstone (Devonian), Anglo-Welsh Basin.
  117. (1994). Prospectivity and play assessment of Abu Qir Bay area,
  118. (2001). Quantitative interpretation of sedimentary structures formed by river dunes.
  119. (2000). Quantitative outcrop data for flow simulation.
  120. (1991). Quaternary geology of the lower Mississippi valley.
  121. (1953). Rational theory of delta formation.
  122. (1988). Recent development in description of sedimentary bodies in a fluvio deltaic reservoir and their 3D conditional simulations. SPE 18310: paper prepared for presentation at the 63 rd
  123. (1994). Reservoir architecture of turbidite sheet sandstones in laterally extensive outcrops, Ross Formation, western Ireland. In: Submarine fans and turbidite systems.
  124. (1986). Reservoir characterization for simulation, Hartzog Draw Field,
  125. (1976). Reservoir geometry of a fluvial sheet sandstone.
  126. (1992). Ripple/dune to upper stage plane bed transition: some observations from the ancient record.
  127. (1985). River deltas.
  128. (1986). River meanders and channel size.
  129. (1991). River- and wave-dominated depositional systems of the Upper Cretaceous Dunvegan Fonnation, northwestern Alberta.
  130. (2003). Rivers andjloodplains.
  131. (2003). RMS Version 7.0.2.1: Introduction to 3D geological modelling.
  132. (1990). Sandbody dimensions and infill sequences of stable humid climate delta plain channels.
  133. (1984). Sandy fluvial systems.
  134. (1997). Scour in large braided rivers and the recognition of sequence stratigraphic boundaries.
  135. (1982). Sediment gravity flows, II. Depositional models with special reference to the deposits of high density turbidity currents.
  136. (1994). Sediment transport and depositional processes.
  137. (1990). Sedimentary architecture of field analogues for reservoir information (SAF ARJ): a case study of the fluvial Escanilla Formation, Spanish Pyrenees. In:
  138. (1986). Sedimentary environments and facies.
  139. (1954). Sedimentary framework of the modem Mississippi delta.
  140. (1996). Sedimentary rocks in the field (second edition).
  141. (1993). Sedimentary structures exposed in bar tops in the Brahmaputra River,
  142. (1982). Sedimentary structures. George Allen and Unwin,
  143. (1979). Sedimentological aspects of oil fields of the Niger delta.
  144. (1969). Sedimentological studies in the West Clare Namurian, Ireland and the Mississippi River delta. Unpublished PhD thesis,
  145. (1999). Sedimentology and sedimentary basins: from turbulence to tectonics. B1ac~ell Science,
  146. (1987). Sedimentology of large braided rivers ancient and modern. Unpublished PhD thesis,
  147. (1982). Sedimentology: process and product (sixth impression).
  148. (1997). Seismic stratigraphy of the Nile Cone sediments.
  149. (2002). Slump-initiated and controlled syndepositional sandstone remobilisation: an example from the Namurian of County Clare,
  150. (1977). Some new Namurian bivalve faunas and their significance i.n the origin of Carbonicola and in the colonisation of Carboniferous deltaic environments.
  151. (1996). Spectral gamma ray characterisation of high resolution sequence stratigraphy: examples from the Upper Carboniferous fluvio-deltaic systems,
  152. (1992). Stratigraphic correlation of Neogene sediments in the eastern Nile Delta and Gulf of Suez, Egypt.
  153. (1978). Stratigraphy and sedimentation of a Neogene-Quaternary section in the Nile Delta area.
  154. (1997). Stratigraphy of the Plio-Pleistocene sequence of the Mediterranean coastal belt of Israel and its implications for the evolution of the Nile Cone. In:
  155. (1977). Structure and sedimentary history of southeastern Mediterranean Sea - Nile Cone area.
  156. (1970). Studies in fluviatile sedimentation: a comparison of finingupward cyclothems, with special reference to coarse-member composition and interpretation.
  157. (1983). Studies in fluviatile sedimentation: bars, bar-complexes and sandstone sheets (low sinuosity braided streams) in the Brownstones
  158. (1996). Submarine landslides.
  159. (1973). Summary of seismic studies in the eastern Mediterranean. In: Selection of papers on the eastern Mediterranean region (23 rd Congress of the CIESM,
  160. (1988). Suspended-load fallout rate as an independent variable in the analysis of current structures.
  161. (1979). Syndepositional sliding and slumping in the West Clare Namurian Basin,
  162. (1991). Tectonic framework and petroleum potential of the Celtic Sea,
  163. (1984). Tectonics and sedimentary history of the NE African margin (Egypt - Libya). In:
  164. (1953). Terminology for stratification and crossstratification in sedimentary rocks.
  165. (1996). Terrigenous clastic depositional systems (second edition).
  166. (1997). The application of sequence stratigraphy to Upper Carboniferous fluvio-deltaic strata of the onshore UK and Ireland: implications for the southern North Sea.
  167. (1954). The beds above the Carboniferous limestone in north-west county Clare,
  168. (1997). The Carboniferous of Western Europe: the development of a petroleum system.
  169. (1995). The Clare Basin: a geological and geophysical
  170. (1963). The classification of cross-stratified units with notes on their origins.
  171. (1981). The evolution of plants andjlowers. Peter Lowe.
  172. (1993). The evolution of the Nile Delta. In:
  173. (1995). The Evolving Continents (third edition).
  174. (1981). The Geological Evolution of the River Nile.
  175. (1996). The Geological Interpretation of Well Logs (second edition). Whittles Publishing, Caithness,
  176. (1988). The geology and seismic stratigraphy of the offshore Nile Delta.
  177. (1992). The geology of Abu Madi gas field.
  178. (1996). The geology offluvial deposits: sedimentary facies, basin analysis and petroleum geology.
  179. (1993). The interaction between channel geometry, water flow, sediment transport and deposition in braided rivers. In:
  180. (1992). The morphology and dynamics of low amplitude bedwaves upon upper stage plane beds and the preservation of planar laminae.
  181. (1974). The Namurian of West County Clare.
  182. (1976). The Nile Cone: submarine fan development by cyclic sedimentation.
  183. (1996). The Pliocene play in the Mediterranean offshore: structural setting and growth faults controlled hydrocarbon accumulations in the Nile Delta basin, a comparison with the Niger Delta basin.
  184. (1993). The River Nile. Geology, Hydrology and Utilisation.
  185. (1998). The Rosetta field: a fast track development case study,
  186. (1969). The sedimentology ofa braided river.
  187. (1986). The stratigraphic framework of the Nile Delta and its implications with respect to the region's hydrocarbon potential.
  188. (1977). The stratigraphy and sedimentology of the Skipton Moor Grits (Namurian E/J and their lateral equivalents.
  189. (1993). The use oflength distributions in geological modelling. In:
  190. (2000). The Western Irish Namurian Basin Reassessed.
  191. (1977). Threshold of sediment motion under unidirectional currents.
  192. (1994). Topics in spatial statistics.
  193. (1983). Towards the field classification of alluvial architecture or sequence. In: Collinson,
  194. (1985). Trace fossil assemblages and their occurrence
  195. (1967). Trace fossils from two upper Pennsylvanian sandstones in Kansas. Paleontological Contributions -
  196. (1990). Transgressions and regressions: a model for the influence of tectonic subsidence, deposition and eustasy, with application to Quaternary and Carboniferous examples.
  197. (1991). Turbidite, slope and deltaic depositional systems in the Namurian basin of western Ireland. Sedimentary Research Associates.
  198. (1980). Unifonnity in marine invertebrate ichnology.
  199. (1981). Updated 1999. Course notes "Geol 135 Sedimentation",
  200. (1987). Upper Carboniferous (Silesian) basin subsidence in
  201. (1973). Variations in morphology of major river deltas as functions of ocean wave and river discharge regimes.
  202. (1979). Vertical and lateral buildings of river sandstone bodies, Ebro Basin,
  203. (1992). West Abu Qir discovery, its exploration significance and case history as part of the Nile Delta exploration tasks.
  204. (1994). West Abu Qir field, an interactive geoscientific model,
  205. (1994). Worldwide initiation of Holocene marine deltas by deceleration of sea-level rise.

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