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Akata Formation

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Modeled pore-pressure history for the base of the <span class="search-highlight">Akata</span> <span class="search-highlight">Formation</span> of the Ni...
Published: 01 February 2004
Figure 7 Modeled pore-pressure history for the base of the Akata Formation of the Niger Delta (dashed line). The data used to construct this figure were manually read from Figure 13 of Caillet and Batiot (2003) . The burial history was calculated from the history of hydrostatic pressure
Image
—Structural map of top of <span class="search-highlight">Akata</span> <span class="search-highlight">Formation</span>, Niger delta, Nigeria.
Published: 01 February 1978
Fig. 3 —Structural map of top of Akata Formation, Niger delta, Nigeria.
Image
—Type sections of <span class="search-highlight">Akata</span> <span class="search-highlight">Formation</span> and of Afam Clay Member of Benin Formatio...
Published: 01 May 1967
Fig. 5. —Type sections of Akata Formation and of Afam Clay Member of Benin Formation. Depths in feel Note added in proof: Afam Shale Member shown in Afam-1 well is an error; should read Afam Clay Member.
Series: Geological Society, London, Special Publications
Published: 01 January 2003
DOI: 10.1144/GSL.SP.2003.207.8
EISBN: 9781862394551
... does not thin out oceanward relative to the underlying Akata Formation. The continuation of this seismic-event-based division of the Tertiary succession into and throughout the ultradeep-water province indicates an abrupt change in depositional style with the arrival of major submarine fans...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1982
AAPG Bulletin (1982) 66 (5): 615–616.
... shales of the Akata Formation prograde over Paleocene and Upper Cretaceous sediments and are overlain by interbedded sands and shale of the Agbada Formation of the deltaic facies proper. The deltaic facies are overlain by the massive freshwater alluvial-plain sands of the Benin Formation...
Journal Article
Journal: AAPG Bulletin
Published: 01 June 2005
AAPG Bulletin (2005) 89 (6): 753–780.
... detachment levels in the overpressured shales of the Akata Formation. Using the patterns of growth sedimentation, fold shapes, fault-plane seismic reflections, and combined conventional and shear fault-bend folding theories, we describe and model the structural styles and kinematics of the fault-related...
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Image
Depth-converted seismic sections showing a comparison between a system with...
Published: 01 June 2005
Figure 14 Depth-converted seismic sections showing a comparison between a system with a shallow detachment and a system with multiple detachment levels in the deep-water fold and thrust systems of the Niger Delta. Both the top of the Akata Formation and the top of the oceanic crust are shown
Series: AAPG Memoir
Published: 01 January 1994
DOI: 10.1306/M60585C36
EISBN: 9781629810928
... of mostly light waxy crude oil and over 7 trillion scf of gas. These hydrocarbons, whose source rocks are both the Akata and Agbada formations, accumulated in sandstone reservoirs of the Agbada Formation within a depth interval of 1000-4000 m. The total cumulative production from 11 oil fields within...
Image
Three-dimensional seismic lines (A and B) showing deformation within the up...
Published: 01 September 2010
Figure 6 Three-dimensional seismic lines (A and B) showing deformation within the upper Akata Formation expressed as detachment unit thinning. This has resulted in the juxtaposition of the overlying Agbada Formation (reflection X) with the mid-Akata detachment level (reflection Y
Journal Article
Journal: AAPG Bulletin
Published: 01 February 1978
AAPG Bulletin (1978) 62 (2): 295–300.
...Fig. 3 —Structural map of top of Akata Formation, Niger delta, Nigeria. ...
FIGURES | View All (6)
Journal Article
Journal: AAPG Bulletin
Published: 01 November 2005
AAPG Bulletin (2005) 89 (11): 1475–1491.
... of the bathymetric slope and dip of the basal detachment) compared with most orogenic fold belts. This low taper implies that the Niger Delta has a very weak basal detachment, which we interpret to reflect elevated pore-fluid pressure (λ ≈ 0.90) within the Akata Formation, a prodelta marine shale that contains...
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(A) Regional stratigraphy of the Niger Delta, depicting the three diachrono...
Published: 01 September 2010
Figure 3 (A) Regional stratigraphy of the Niger Delta, depicting the three diachronous lithological units of the Akata, Agbada, and Benin formations (from Corredor et al., 2005 ) originally modified from Lawrence et al. (2002) , used with permission of AAPG. (B) Seismic stratigraphy of a deep
Series: Geological Society, London, Memoirs
Published: 01 January 2004
DOI: 10.1144/GSL.MEM.2004.029.01.05
EISBN: 9781862394049
... thrusting where faults have climbed from a detachment surface at or near the top of the over-pressured Akata Formation mudstones. The overlying mixed clastic succession of the Agbada Formation has been faulted by a broadly oceanward stepping series of NW-SE trending thrusts climbing from this detachment...
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Journal Article
Journal: AAPG Bulletin
Published: 01 October 1972
AAPG Bulletin (1972) 56 (10): 1975–1983.
.../shale unit (Agbada Formation); (3) marine shale unit (Akata Formation); (2) transitional shale-sand unit (newly distinguished); (1) bottom submarine fan sand unit (newly distinguished). Other deltas feeding into waters of oceanic depths may have a comparable structure. 1 Manuscript received...
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Journal Article
Journal: AAPG Bulletin
Published: 01 May 1967
AAPG Bulletin (1967) 51 (5): 761–779.
...Fig. 5. —Type sections of Akata Formation and of Afam Clay Member of Benin Formation. Depths in feel Note added in proof: Afam Shale Member shown in Afam-1 well is an error; should read Afam Clay Member. ...
FIGURES | View All (8)
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1967
AAPG Bulletin (1967) 51 (3): 464.
... of alternating sandstone and shale; and, at the base, the marine, shaly Akata Formation. The principal oil discoveries have been made in the Agbada Formation. The accumulations are controlled largely by growth faults and rollover anticlines which are located primarily by seismic surveys. Exploration drilling...
Journal Article
Journal: AAPG Bulletin
Published: 01 March 1966
AAPG Bulletin (1966) 50 (3): 634–635.
..., comprised of an upper sandy unit called the Benin Formation, an intervening unit of alternating sandstone and shale named the Agbada Formation, and a lower shaly unit called the Akata Formation. These three units extend throughout the delta and each ranges in age from early Tertiary to Recent. A separate...
Journal Article
Published: 01 December 2007
Environmental Geosciences (2007) 14 (4): 181–195.
.... The delta is underlain by a sequence of three layers of clastic Tertiary sediments, from top to bottom: the Benin, Agbada, and Akata formations. The delta is one of the most hydrocarbon-rich regions in the world. Petroleum has been produced over the last three decades from the Agbada Formation by several...
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Series: AAPG Studies in Geology
Published: 01 January 2005
DOI: 10.1306/St531003C13
EISBN: 9781629810447
... underlies the fold indicating the presence of a sub-horizontal detachment surface in the pro-delta Akata Formation. Detachment folding requires ductile thickening of the Akata Formation above the basal detachment in the core of the fold. Figure 1: Bathymetry of the offshore Niger Delta showing...
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... in this area takes the form of folding due to the up-dip gravitational collapse of the Niger Delta above the overpressured shale detachment of the Akata Formation. The seafloor relief formed by folding is initially...
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