By Walter H. Fertl
Petroleum formation pressures
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Additional resources for Abnormal Formation Pressures: Implications to Exploration, Drilling, and Production of Oil and Gas Resources
The known stratigraphic section at the domes consists of about 15,000f t [4572m] of interbedded sandstone and shale underlain by a predominantly shale section with abnormally high pore pressures. The physical properties and differences in physical properties of the sandstone and shale sequence, predominantly shale section, and salt of these saltcdome structures are partly responsible for the geometry of the structures. Structural details and features which were studied in an effort to understand the history of the salt structures were the ‘sheath’ configuration, indications of uplift and differential subsidence, development of rim synclines, and faulting and fault patterns.
S. Gulf Coast Basin have been discussed by Harkins and Baugher (1969) as the direct result of the structural and depositional history. Genesis of overpressures during geologic time is controlled by the environment of deposition on the paleocontinental shelf and slope, the geometry and lithology of the sediments, regional and local faulting, basin hinge lines, burial and compaction, and subsequent structural deformation. S. Gulf Coast area: “The Neogene deltaic and neritic marine deposits in the northern Gulf of Mexico Basin form regional aquifer systems in which pore pressures, salinities and temperatures do not compare with those in older sedimentary basins.
Subsurface water distribution (after Powers, 1959; Burst, 1969). ) ABNORMALLY HIGH FORMATION PRESSURES 37 “Water, the principal fluid component of the sedimentary section, is thought to migrate in three separate stages. Initially, pore water and excessive (more than two) clay-water interlayers are removed by the action of overburden pressure. This initial water flow (which is essentially completed after the first few thousand feet of burial) reduces the water content of the sediment to about 30% most of which is in the semisolid interlayer form.
Abnormal Formation Pressures: Implications to Exploration, Drilling, and Production of Oil and Gas Resources by Walter H. Fertl