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| Paper Type | : | Research Paper |
| Title | : | Petrological Characterisitics and Paleodepositional Environment of the Sandstones of the Ameki Group (Eocene) In Bende and Isimkpu Areas, Southeastern Nigeria |
| Country | : | Nigeria |
| Authors | : | P. N. Obasi || A. U. Okoro || E. O. Igwe || E. N Edene |
Abstract: Petrological characteristics of sandstones outcropping in Bende and Isimkpu areas was carried out using sieve analysis and pebble morphometric studies in determination of the paleodepositional environment for Sandstone facies of the Ameki Group. Lithostratigraphic studies show that the area is underlain by sandstones, calcareous sandstone, shales, mudstones and clays. This has been organized into: Unit A: Idima junction shale; B: Bende sandstone; C: Onuinyang calcareous siltstone and D: Isimkpu sandstone, from oldest to youngest. Representative sandstone samples were collected from outcrops widely distributed in the area.
[1]. Adegoke, O. S; 1969, Eocene stratigraphy of southern Nigeria. Bull. Bur. Rech. Geo Min mem no. 69,22-48.
[2]. Adegoke, O. S; Arua, I; Oyegoke, O;1980. Two new nautiloids from the Imo shale (Paleocene) and Ameki Formation (Middle Eocene) Anambra State, Nigeria.Jour. Of Mining and Geol. 17, 85-89.
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| Paper Type | : | Research Paper |
| Title | : | Provenance, tectonic setting and diagenesis of the Mn-Fe coated terrigenous clastsfrom the modern soil profiles, North West Province of South Africa: a case study of theCarletonville area. |
| Country | : | South Africa |
| Authors | : | B.K. Pharoe || C.Baiyegunhi || K. Liu |
Abstract: The arkosic and subordinate quartz-arenitic Mn-Fe coated terrigenous clasts were discovered to occur in association with manganese nodules hosted by weathered Mn-Fe rich alluvial-fluvial sediments of the Tertiary period in Carletonville area. The weathered Mn-Fe rich alluvial-fluvial sediments form the modern soil profiles in the study area. The Scanning Electron Microscope and petrographic studies of the terrigenous clasts indicated elevated content of manganese oxide precipitated in pore spaces between the framework grains as well as forming surface coatings on hand specimen. These clasts are mined with manganese nodules in the study area.
[1] A. Basu, S. Young, L.J. Suttner, W.C. James and C.H. Mack, Re-evaluation of the use of Undulatory extinction and polycrystallinity in detrital quartz for provenance interpretation,Journal of Sedimentary Petrology,45,1975,873–882. [2] M.E. Dabbagh and J.J. Rogers, Depositional environments and tectonic significance of the Wajid sandstone of southern Saudi Arabia,Journal of African Earth Sciences, 1983,47–57. [3] W.R. Dickinson, L.S. Beard, G.R. Brackenridge, J.L. Evjavec, R.C. Ferguson, K.F. Inman, R.A. Knepp, F.A. Linberg and P.T. Ryberg, Provenance of Northern American Phanerozoic sandstones in relation to tectonic setting,Geological Society of America Bulletin, 94, 1983, 222-235.
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| Paper Type | : | Research Paper |
| Title | : | Time-Frequency Attenuation of Swell Noise on Seismic Data from Offshore Central Niger-Delta, Nigeria. |
| Country | : | Nigeria |
| Authors | : | Tamunobereton-ari, I || Ngeri, A.P. || Amakiri, A.R.C. |
Abstract: Diversity of noise types with different characteristics makesseparation of signal and noise a challenging process.Swell noiseusually contaminates tracesand it is characterized by high amplitude and low frequencies and affects only a limited band offrequencies.This work presents how FX projection filter (FXEDIT code) processing approach was used to attenuate swell noise on dataset from a marine seismic survey offshoreCentral Niger-Delta, Nigeria, which shows as an effective amplitude preserving and robust tool that gives better results compared to many other conventional filtering algorithms.With this processing approach and working side-by-side with the shot gather and the RMS windows; the results achieved are reliable and satisfactory by giving clearer images for reservoir characterization.
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