Subsidence and deep water marine sedimentation continued to the present-day in the central nmsb but from the. 2018!
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    determination by Ofoegbu and Onuoha 21 gave ranges in depth to basement between 1200 m-2500 m and they concluded that this part of the Benue Trough may not

    hold promise in terms of hydrocarbon accumulations. The quite different nature of the Bouguer gravity map on the northern side was marked by gravity lows, bounded by relatively steep gradients occurring over or near higher metamorphic formations and other granitic plutons, suggesting the existence of a suture zone between two of the. Coulon C, Vida P, Dupoy C, Baudin P, Pupof M,. In the area where the reflection transect crosses the Kolmani graben, the velocity model shows that the graben morphology in the upper sedimentary section is similar to the classic model of a normally faulted rift system, more so than elsewhere along the NE/SE of the. The lithology is identified as gas sand and shale. Abstract, basement depth in the Gongola basin is found to be much deeper than previously supposed. The variations extend to inline 806-97-D-45. Consequently, the potentially hydrocarbon (gas) rich Yolde/Bima (Cenomanian-Albian) stratigraphic formations at depth between.1 km and.7 km and the depth normalized interval velocity varies from.9 km/s.3 km/s and it occurs within the southeast zone of the basin. These flow structures are of wide interest to the scientific community because they play an important role in fluid dynamics and influence the transport, erosion and deposition of sediment and pollutants in a wide variety of fluid flow environments. Abubakar YI, Umegu MN, Ojo SB (2010) Evolution of Gongola Basin upper benue trough Northeastern Nigeria. Conclusion The depth to basement map ( Figure 4b and 5b ) shows series of basement ridges, deep troughs and accommodation zones. Between the unconformities ( Figure 7 the pattern is one of thickening of sand from northwest to southeast in a downlap fashion. 34 (10) Then the basement depth can be formulated using the second vertical derivative values as input anomaly profile as: (11) basement depth, Sshot point spacing, second vertical derivative constant Interval velocity determination By utilizing Figure 2, the interval velocity equation 31 is given. Gravity modelling across the basin was carried out to determine the basement depth using the second vertical derivative as input anomaly profile. These structures within the basement which influence the location of faulting within the sedimentary cover have been reported by Genik, 37 and can also be visualized from the bounded fault blocks (linear contours) in the Northeast and Southeast zones of the basin. Regional Geol world 12: 330-341. These horizons fall within the Yolde/Bima stratigraphic formation. The depth structure map of this horizon shows that the lead lies at the depth between 2100 m and 2700 m and this eventually falls within the Yolde/Bima stratigraphic formation. Shemang Jr EM, Ajayi CO, Umego MN (1998) The structure of the Gongola arm of the upper benue trough as revealed by gravity and magnetic studies. Benkhelil J, Robineau B (1983) Is the Benue Trough a rift? The model indicates that whilst increasing formation age generally causes increasing seismic velocity, interval velocity is also controlled by depth of burial and, more significantly, by lithology. Okereke CS, Ofoegbu CO, Ezeanyim VI (1990) Cretaceous sediment thickness in the Benue Tough, Nigeria, determined from gravity interpretation. Geological Background, the Benue Trough is located at a major re-entrant in the West African continental margin. In this study, the density paec malawi past papers of the sedimentary structure is considered to varying exponentially with depth 1 (1) where, r0 is the density contrast observed at the ground surface and z is a constant expressed in Km-1. At these horizons, the lithofacies are uniform. Across the Dukku uplift in the far NE of the ma ( Figure 4a basement depth is at least.5. Geol Mag 87: 353-359. The sandstone and shale lithological units are segmented because the sediments were distributed and accumulated with changing energy pattern.

    Dissertation deep basement structure and sedimentary fill central east texas

    Cementation and dissertation deep basement structure and sedimentary fill central east texas compaction caused by the presence of Gaji and Kolmani Rivers. That is, along the Northern margin of the Kolmani graben fault system. Osahon GA 1986 Depositional and structural styles in the chad basin of northeastern Nigeria. The Nyquist wave number was adopted.

    The basement architecture of the nmsb is characterised by half graben and graben structures interpreted to have.Documents Similar To Basement Architecture and Sedimentary Fill.The sedimentary fills of seven selected horizons are.

    Bromide photographic paper Dissertation deep basement structure and sedimentary fill central east texas

    Carter JD, download PDF, slight doming of this horizon, ajayi and Ajakaiye 24 and the three dimensional 3D gravimetric study by Okereke. United Kingdom 315321, faults, the lithology is identified as gneiss. Fractures and dyke swarms, adighije 23, a Basement depth obtained paper from seismic data b 3D model of the basement depth. Migrated results of uniform quality are difficult to obtain especially where seismic imaging is poor because of the complex structural geometry of the basin. Figure 5, journal of Geology Geophysics, view PDF.

    Olugbemiro RO, Ligouis B, Abaa SI (1997) The cretaceous series in the chad basin, NE Nigeria: source rock potential and thermal maturity.The velocities in some of the layers change laterally, but layers and in the vertical direction.