Structural evolution and sequence formation offshore South Gabon during the Tertiary
作者： Erik S. Rasmussen
DOI: 10.1016/S0040-1951(96)00236-3
关键词: Geology 、 Neogene 、 Sequence stratigraphy 、 Structural geology 、 Salt tectonics 、 Subsidence 、 Slumping 、 Middle Miocene disruption 、 Paleontology 、 Structural basin
摘要: Abstract The present investigation of the Tertiary succession offshore South Gabon is based on seismic surveys 1985–1989 vintage and wells covering southern part Gabonese waters. In general, basin off evolved during two structural stages. During Paleocene Early-Middle Eocene, a trough-like subsided slowly towards west. this period there was cyclic development which consists up to four sequences mostly bounded by Type 2 sequence boundaries. sequential changes were induced eustatic sea-level changes. This pattern changed Neogene when evolution characterized continental crustal flexuring in Miocene times. resulted strong subsidence western uplift eastern part. Consequently, exposed erosion thick Middle deposited west shelf (approximately present-day shelf), especially slope. clinoformal lens-shaped Middle-Late 1 boundaries has been controlled sea level. addition overall pattern, salt tectonics modified external internal architecture local scale. Canyon formation connection with slumping results establishment well developed fan systems lower slope floor area.
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