Version-2 (Nov-Dec-2016)
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| Paper Type | : | Research Paper |
| Title | : | Statistical Characterization of Geomagnetic Variation in Nigeria |
| Country | : | Nigeria |
| Authors | : | Odumodu Francis Arinze || Odumodu Nneka Chigozie || Chukwelu E.E |
Abstract: The solar quiet daily variations and the solar disturbed daily variations have been studied for the years 2006-2009 using geomagnetic data obtained from Space Environment Research Centre, Kyusyu-U using the Magnetic Data acquisition System at Ilorin (Latitude 8.5, Longitude 4.68). The analysis was carried out on Solar quiet and Solar disturbed days respectively using hourly values of H, D, and Z magnetic field values. The values of Solar quiet variation of the H and Z components are compatible in the sense that they both rise at about sunrise 0600 hrs LT............
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| Paper Type | : | Research Paper |
| Title | : | Geochemistry of the Tholeiite and Alkaline Dykes of Nongryngkoh-Padu-Jarain Area, Meghalaya, North East India: Evidence for Kerguelen plume-involvement in an Extensional Regime |
| Country | : | India |
| Authors | : | M.A. Khonglah || Sougrakpam Sujata || Imlishila Imchen || R. Baskaran |
Abstract: Episodic network of dykelets/dykes/sills intrude the Precambrians of Padu-Nongryngkoh-Jarain area, East Meghalaya Plateau, North East India; close to a weak intersection zone of Raibah and Umngot faults in an extensional phase caused by upwelling of the Kerguelen Plume. Olivine and diopside macrocrysts/microcrysts and xenocrysts with calcite or, analcite ocelli dispersed in a tholeiitic or, alkali basaltic or, alkaline base implies a rapid and violent ascent to the surface. The dykes are picritic, tholeiitic, alkaline to occasionally calc-alkaline. The ultramafic and some of the alkaline dykes are abundant in compatible elements, along with high Mg# suggesting a primitive source while mildly enriched LILE (e.g., Sr, K, Rb, Ba, Th), HFSE (e.g., Nb & Zr) and LRE............
Keywords: Early Cretaceous Sylhet Trap, tholeiites, alkali basalt, nephelinite.
[1] Aldanmaz, E., Pearce, J.A., Thirlwall, M.F., Mitchell, J.G. (2000): Petrogenesis evolution of late Cenozoic, postcollision volcanism in western Anatolia, Turkey. J. Volcanol. Geotherm. Res., 102: 67-95.
[2] Chen, W., Arculus, R.J., (1995): Geochemical and isotopic characteristics of lower crustal xenoliths, San Francisco Volcanic Field, Arizona, U.S.A. Lithos 110, 99–119.
[3] Cox, K.G. (1980): A model for flood basalt volcanism. Jour. Pet. 21, 629-650.
[4] Culler, R.L. & Graf, J.L. (1984): Rare earth elements in igneous rocks of the continental crust: predominantly basic and ultrabasic rocks. In Rare Earth Element Geochemistry (P. Henderson, ed.). Elsevier, Amsterdam, Netherlands (237-274).
[5] De Paolo, D.J. (1981): Trace element and isotopic effects of combined wall-rock assimilation and fractional crystallization. Earth Planet. Sci. Lett., 53: 189-202.
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| Paper Type | : | Research Paper |
| Title | : | Formation Evaluation of an Onshore Oil Field, Niger Delta Nigeria |
| Country | : | Nigeria |
| Authors | : | Leonard I. Nwosu || Doris N. Ndubueze |
Abstract: The formation evaluation of an onshore oil field has been carried out. Suite of geophysical logs comprising gamma ray, resistivity, density and neutron from five oil wells were used. Alternation of sandstone and shale lithologies were delineated within the interval logged which is typical of the Agbada Formation in the Niger Delta. A total of five reservoirs (W400, W500, W600, W700, W800) were observed in the five. The hydrocarbon fluid typeswere differentiated withthe aid of density and neutron logs ran on the same track. The topmost reservoir (W400) is dominated by gas while the other reservoirsare mainly oil bearing............
Keywords: Formation Evaluation; Porosity, Permeability, Reservoir, Niger Delta.
[1]. Adeoye, T.O. and Enikanselu, P. (2009). Reservoir Mapping and Volumetric analysis using Seismic and Well Data. Ocean Journal of Applied Sciences, Vol. 2, Issue 4 p. 66 – 67
[2]. Aigbedion, J.A. and Iyayi, S.E. (2007). Formation Evaluation of Oshioka Field, using geophysical well logs Middle-east Journal of Scientific Research 2(3 –4) p.107 – 110.
[3]. Asquith, G and Krygowski, D (2004). Basic Well Log Analysis. American Association of Petroleum Geologist, pp. 244.
[4]. Doust, H and Omatsola, E. (1990). Niger Delta, in Edwards, J.D, and Santogrossi, P.A ,eds; Divergent/passive Margin basins; AAPG Memoir 45; pp 239-248.
[5]. Ekine A.S and Iyabe, P (2009).PetrophysicalCharaterization of the Kwale Field Reservoir Sands (OML 60) from Wire-line Logs in Niger Delta, journal of Applied Physics e-ISSN: 1119-8362. Vol. 13(4) 81-85.
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| Paper Type | : | Research Paper |
| Title | : | Detection of Soil Surface Warming in Madurai District, South India Using Geospatial Techniques |
| Country | : | India |
| Authors | : | Suhatha Rahima S || Gurugnanam B |
Abstract: The study aimed to analyze the historical changes of soil moisture Index of Madurai District, South India using remote sensing techniques.Soil moisture index retrieved from Landsat data for 1991, 2001, 2003, 2010 and 2016. The NDVI and Land Surface Temperature were calibrated and then the relative soil moisture data were calculated using remote sensing techniques. The soil moisture were classified in to five groups and the changes were monitored since 1991. The black soil possessed high soil moisture and alluvial soil possessed low moisture. The high and very high soil moisture zones were present in 1991image and these zones were absent in other images..........
Keywords: Soil Moisture Index, Global warming, Soil Surface Warming, Remote Sensing
[1] Baldocchi, D.D. and Xu, L. (2007) What limits evaporation from Mediterranean oak woodlands: the supp. ly of moisture in the soil, physiological control by plants or the demand by the atmosphere? Adv. Water Resour. V. 30, pp. 2113–2122.
[2] Berndtsson, R., Nodomi, K., Yasuda, H., Persson, T., Chen, H. and Jinno, K. (1996) Soil water and temperature patterns in an arid desert dune sand. J Hydrol., v. 185, pp. 221–240, doi:101016/jadvwatres.2006.06.013.
[3] D'odorico, P., Caylor, K., Okin, G.S. and Scanlon, T.M. (2007) On soil moisture–vegetation feedbacks and their possible effects on the dynamics of dryland ecosystems. J. Geophys. Res. v. 112, G04010. doi:1029/2006JG000379
[4] De Ridder, K. (2000). Quantitative estimation of skin soil moisture with the Special Sensor Microwave/Imager. Boundary-Layer Meteorology, v. 96, pp. 421−432
[5] Famiglietti, J.S., Rudnicki, J.W. and Rodell, M. (1998) Variability in surface moisture content along a hillslope transect: Ratlesnake Hill, Texas. J Hydrol., v. 210, pp. 259–281. doi:10.1016/S0022-1694(98) 00187-5.
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| Paper Type | : | Research Paper |
| Title | : | Post Stack Attenuation of Peg-Leg Multiples |
| Country | : | India |
| Authors | : | Anil Kumar Semwal |
Abstract: Peg-leg multiples associated with reflectors just below the water bottom are among the concerns, a processing geophysicist is worried about. Peg-legs can be attenuated in both pre & post stack stages. Pre stack attenuation processes are relatively more expensive than those of post stack ones. Multiple attenuation technique based on periodicity of multiples is opted here & exercised on a stack data set pertaining to shallow 2D marine regime
Keywords: Amplitude spectrum, geometrical spreading, Peg-leg multiple, stack, water bottom library
[1]. Yilmaz Ozdogan, Seismic Data Analysis, (SEG, 2011) 843, 856
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| Paper Type | : | Research Paper |
| Title | : | Application of Surface Consistent Amplitude Corrections as a Manual Editing Tool |
| Country | : | India |
| Authors | : | Anil Kumar Semwal |
Abstract: TManual editing serves as tool for removing strong noise bursts or spikes in the data. This requires huge effort when dealing with big volume of seismic data and attempting the human errors are inevitable at the same time. In the present work an effort is made on a field dataset to show that application of surface consistent amplitude corrections furnishes better results without human bias which is incumbent otherwise in manual editing.
Keywords: Process time, surface consistent amplitude correction, manual editing, time-gain correction
[1]. Yilmaz Ozdogan, Seismic Data Analysis, (SEG, 2011) 325.
[2]. Taner, M.T., and Koehler, F., 1981, Surface Consistent Corrections, Geophysics, Vol. 46, No. 1, 17-22.
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| Paper Type | : | Research Paper |
| Title | : | Sequence Stratigraphy Analysis of "Unik" Field, Onshore Niger Delta, Nigeria |
| Country | : | Nigeria |
| Authors | : | Oluwatoyin Khadijat Olaleye |
Abstract: The sequence stratigraphic analysis of "Unik" Field located in the Coastal Swamp area of Niger Delta Basin has been carried out. Geophysical wire-line logs from nine wells and a 3-dimensional seismic data in SEGY format were utilized. In the study, the lithologies were identified, the potential reservoirs detected and the reservoir characteristics of the field predicted. Also, sequences, systems Tracts and facies were generated on seismic volume. Ten electrofacies characterizing the main facies of the depositional environments were interpreted within correlative well log depth range of the "Unik" field. These electrofacies includes: floodplain, transgressive shoreline, point bar............
Keywords: Sequence Stratigraphy, Amplitude, Seismic, Niger Delta
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Howell J. A. and Aitken J. F. eds Innovations and applications in High Resolution Sequence Stratigraphy. Geol. Soc. Spec Pub v.
104, p 1-6.
[2]. Doust, H., and Omatsola, E., (1990). Niger Delta, In: Edwards, J. D., and Santogrossi, P.A., eds., Divergent/passive Margin Basins,
AAPG Memoir 48: Tulsa. American Association of Petroleum Geologists, p. 239-248.
[3]. Ehinola O. A. and Ejeh O. I., (2009).Basin Geometry and Sedimentary Fill Modeling of parts of Onshore Niger Delta, Nigeria.
Kuwait Journal of Science and Engineering.36(2A) pp 147-163
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analysis as pioneer techniques for delineation of reservoir quality sand bodies in the Indus-Offshore Basin, Southwest Pakistan.
Leading Edge 29(5): 524–529