By Walter H. Fertl
Petroleum formation pressures
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Extra resources for Abnormal Formation Pressures: Implications to Exploration, Drilling, and Production of Oil and Gas Resources
18. 18. A. (after Murray, 1961). 19. Development of three types of contemporaneous fault systems (after Bruce, 1973). 19, with differentiation based on rates of deposition of sandy sediments upon unconsolidated clay surfaces. According to Bruce (1973): “Two of these types are considered t o be associated with sea floors which were relatively flat at time of deposition, and the third appears to be formed in areas of slope environments where sea-floor subsidence exceeded the rate of deposition. 19a) represents faults formed during a regressive sequence of deposition (progradation locally), when the amount of sediment available for deposition was greater than the space available for accumulation.
14 ABNORMAL FORMATION PRESSURE ENVIRONMENTS Abnormally high formation pressures (surpressures) Abnormally high pore fluid pressures are encountered worldwide in formations ranging in age from the Cenozoic era (Pleistocene age) to as old as the Paleozoic era (Cambrian age). e. permeable, fluid communicating formations allow establishment and/or reestablishment of hydrostatic conditions. Conversely, abnormally high formation pressure systems are essentially “closed”, preventing, or at least greatly restricting, fluid communication.
Types of fault seals necessary to preserve abnormal-pressure environments (after Dickinson, 1953). e. sand to shale contact across a fault) are overpressured. 17. Schematic section showing stratigraphic rise of overpressures in relation to prograding sedimentation modified by growth faults (after Harkins and Baugher, 1969). 171 According to Dickey et al. S. Gulf Coast, with the ABNORMALLY HIGH FORMATION PRESSURES 25 complex down-to-thebasin growth faults (Ocamb, 1961;Thorsen, 1963)of southern Lousiana apparently being caused by slumping along the edge of the continental shelf during sedimentation.
Abnormal Formation Pressures: Implications to Exploration, Drilling, and Production of Oil and Gas Resources by Walter H. Fertl