Changes in reservoir quality determined from the diagenetic evolution of Triassic and Lower Lias sedimentary successions (Balazuc borehole, Ardèche, France)
Marine and Petroleum Geology(1996)
摘要
Diagenetic mineral sequences in Triassic and Lower Lias sedimentary successions studied in the Balazuc borehole are seen to have modified the initial reservoir qualities of the formations. The upper part of the Triassic Lower Sandstone unit and the Hettangian Lower and Upper Calcarenite units were initially good quality reservoirs, whereas the Triassic Upper Sandstone unit and the Rhaetian Sandstone unit were initially average quality reservoirs, temporarily improved by pedogenesis. Early burial induced partial plugging of the initially porous bodies as a result of fluid exudation from proximal sediment bodies; the circulation of these fluids brought about alteration, dissolution and mineral deposition. Tectonic events associated with the formation of the Southeast Basin palaeomargin caused movement along the Uzer Fault and imparted a fracture porosity to the buried sedimentary formations. However, increasing subsidence and burial reactivated fluid circulation, dissolution and mineralization with further plugging of pore spaces.
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关键词
reservoir quality,diagenesis,mineral sequences,depositional environments,burial,tectonism,porosity,geometry of sedimentary bodies
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