by Mohamed Elfatih Z. GANDOL, Ram Raj MATHUR and Ali A. M. EISAWI
Original Research
The Muglad and Melut basins and the Baggara Graben form the oil and gas fields of Sudan and South Sudan. The reservoirs rich in hydrocarbon content are sandstones of the Aptian-Lower Albian Abu Gabra formation deposited during the first rifting phase. Integrated seismic data, well logs and Pyrolysis analysis were carried out to generate correlation models between Azraq, Bamboo and Heglig oil fields in the Muglad rift basin. The study was based on 6 seismic lines, 8 master logs, 4 wireline logs and 303 cutting samples selected from eight wells. The seismic profiles identified the structural effects of normal and reverse faults exist with horst and graben structures formed and give rise to parallel set of faults. The stratigraphic correlation model of well logs has established 12 main units in the Muglad basin, in good agreement with earlier studies. The Rock-Eval pyrolysis results of 303 samples carried out to assess the hydrocarbon content and to evaluate the source rock quality from the Azraq, Bamboo and Heglig wells indicate that the hydrocarbon potentiality of the Abu Gabra formation decreases from the north to south in agreement with the average Total Organic Carbon (TOC) values 2.34, 0.45 and 1.22% respectively. The average values of the Potential Hydrocarbons (S2) also support the TOC results. The correlation model developed from these studies show a general increase of the thickness from the north to south, which emphasizes the fact that the fault system is a result of tectonic rifting of the Muglad basin. The present approach has served as a correlation between the effect of the structural features and the hydrocarbon quality of the Muglad basin.
Journal of Geosciences and Geomatics. 2016, 4(4), 82-90. DOI: 10.12691/jgg-4-4-2
Pub. Date: July 05, 2016
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by Arianna Pesci, Giordano Teza, Marina Bisson, Filippo Muccini, Paolo Stefanelli, Marco Anzidei, Roberto Carluccio, Iacopo Nicolosi, Alessandro Galvani, Vincenzo Sepe and Cosmo Carmisciano
Original Research
The Structure-from-Motion photogrammetry (SfM) allows a fast and easy data acquisition and a highly automated data processing, leading to accurate photorealistic point clouds. The results of a SfM-based modeling of the coastal zone of Monterosso a Mare (Eastern Liguria, Italy) are shown here. Four photogrammetric surveys of the area were carried out from both moving surface (boat) and aerial (Unmanned Aerial Vehicle) platforms. The corresponding results were compared in order to provide information about precision and model reliability from fast ad cheap SfM surveys carried out without Ground Control Points (GCPs). The important issue of scale factor evaluation was solved by means of selection of points easily recognizable in each point cloud and measurement of the length of the polyline that connects these points. The ratio between the lengths of the polyline defined on a point cloud and the corresponding polyline defined in a metric reference frame provided the scale factor. The results highlight that the SfM technique can be used in emergency conditions, where GCPs cannot be used, and is compatible with a floating platform-based observation, leading to point clouds whose resolution is some centimeters for an acquisition distance of 100-150 m.
Journal of Geosciences and Geomatics. 2016, 4(4), 73-81. DOI: 10.12691/jgg-4-4-1
Pub. Date: July 01, 2016
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