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@TECHREPORT{Zwach:136108,
      author       = {Zwach, Christian and Institut für Erdöl und Organische
                      Geochemie (Jülich, 4) and Universität (Kiel)},
      title        = {{D}iagenesis and temperature history of the cadotte
                      sandstone, {A}lberta deep basin, {C}anada: integration of
                      reservoir quality analysis and basin modeling},
      volume       = {3082},
      number       = {Juel-3082},
      address      = {Jülich},
      publisher    = {Forschungszentrum},
      reportid     = {PreJuSER-136108, Juel-3082},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {XIV, 173 S.},
      year         = {1995},
      note         = {Record converted from JUWEL: 18.07.2013},
      abstract     = {An integrated approach was applied to study how reservoir
                      quality has evolved in one of the major gas reservoirs in
                      the Alberta Deep Basin, the Albian Cadotte Sandstone. The
                      study area lies in the northern part of the basin close to
                      the Elmworth gas field. Porosity and permeability of the
                      Cadotte Sandstone is very low and decreases generally with
                      the burial depth. However, detailed analyses show that
                      formation porosity decreases much more regularly with the
                      estimated maximum burial depth than with the present burial
                      depth. Geostatistical analysis exhibits a spatial anisotropy
                      of formation porosity in that porosity varies more in strike
                      direction than in dip direction ofthe formation. Porosity
                      and permeabilityofthe Cadotte is mainly affected by early
                      formation of pore filling kaolinite, and later
                      grain-surface-dissolution of rock fragments, and quartz
                      cementation. Kaolinite formation resulted from the breakdown
                      of muscovite and K-feldspar under the influence of meteoric
                      water with low [I1]/[K+] ratio. Rock fragments such as chert
                      grains were affected by grain-surface-dissolution due to
                      surface reactions between illitic clay minerals and
                      microcrystalline quartz. This process resulted in the
                      formation of stylolitic grain-to-grain contacts and thick
                      solution seams containing mainly illite. The released silica
                      precipitated selectively on detrital monocrystalline quartz
                      grains with lower specific surface area. The overall process
                      of silica redistribution can be regarded as grain
                      coarsening, analogous to Ostwald ripening. Best reservoir
                      quality is therefore found in well-sorted, coarse-grained
                      sediments with low amounts of pore filling kaolinite.
                      Critical factors for the redistribution of silica, besides
                      the maximum burial depth of the formation, are the amount of
                      detrital quartz grains, the illite content of the rock
                      fragments, the crystal size of the quartz in the fragments,
                      and the presence of kaolinite between the grains. Basin
                      modeling applied to the study area shows that the maximum
                      temperature in the Cadotte Sandstone was reached in Early
                      Tertiary times when deepest burial occurred. A comparison of
                      quartz cementation temperatures derived from fluid inclusion
                      studies of the Cadotte with the reconstructed temperature
                      history of the formation showed a close match of the maximum
                      burial temperature with the maximum cementation
                      temperatures. Fluid inclusion data of quartz cements may
                      therefore be used to some extent for further calibration of
                      basin models. Coupled chemical reaction and fluid flow
                      modeling using the reconstructed temperature history of the
                      Cadotte Sandstone as input showed that advective fluid flow
                      can not account for the widespread occurrence of quartz
                      cement in the formation. This indicates the importance of
                      internal redistribution processes during deep burial
                      diagenesis. Sensitivity analyses of the basin model showed
                      that the effect of heat insulation of the gas emplacement in
                      the Alberta Deep Basin is a critical factor in determining
                      the accurate temperature and heat flow history in addition
                      to lithological parameters such as coal percentages in
                      formations. Gas filling of pore space may therefore result
                      in a feed back effect, where increased heating of source
                      rocks due to heat insulation causes additional hydrocarbon
                      generation. An enhanced understanding of the history of
                      reservoir quality results from the integration of reservoir
                      quality analysis and basin modeling and is thus important
                      for reservoir quality prediction in the exploration and the
                      production of gas, oil and water from sedimentary
                      formations.},
      cin          = {ICG-4},
      cid          = {I:(DE-Juel1)VDB793},
      shelfmark    = {GHHF - Sedimentary basins},
      typ          = {PUB:(DE-HGF)29},
      url          = {https://juser.fz-juelich.de/record/136108},
}