Modeling of gas generation from the Alam El-Bueib formation in the Shoushan Basin, northern Western Desert of Egypt     

Mohamed Ragab Shalaby  Mohammed Hail Hakimi  Wan Hasiah Abdullah 《International Journal of Earth Sciences》2013,102(1):319-332

The Shoushan Basin is an important hydrocarbon province in the northern Western Desert, Egypt, but the burial/thermal histories for most of the source rocks in the basin have not been assigned yet. In this study, subsurface samples from selected wells were collected to characterize the source rocks of Alam El-Bueib Formation and to study thermal history in the Shoushan Basin. The Lower Cretaceous Alam El-Bueib Formation is widespread in the Shoushan Basin, which is composed mainly of shales and sandstones with minor carbonate rocks deposited in a marine environment. The gas generative potential of the Lower Cretaceous Alam El-Bueib Formation in the Shoushan Basin was evaluated by Rock–Eval pyrolysis. Most samples contain sufficient type III organic matter to be considered gas prone. Vitrinite reflectance was measured at eight stratigraphic levels (Jurassic–Cretaceous). Vitrinite reflectance profiles show a general increase of vitrinite reflectance with depth. Vitrinite reflectance values of Alam El-Bueib Formation range between 0.70 and 0.87 VRr %, indicating a thermal maturity level sufficient for hydrocarbon generation. Thermal maturity and burial histories models predict that the Alam El-Bueib source rock entered the mid-mature stage for hydrocarbon generation in the Tertiary. These models indicate that the onset of gas generation from the Alam El-Bueib source rock began in the Paleocene (60 Ma), and the maximum volume of gas generation occurred during the Pliocene (3–2 Ma).  相似文献   

Erratum to: Liquid hydrocarbon generation potential from Tertiary Nyalau Formation coals in the onshore Sarawak, Eastern Malaysia     

Mohammed Hail Hakimi  Wan Hasiah Abdullah 《International Journal of Earth Sciences》2013,102(1):349-349

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Fracture systems of granites and Quaternary deposits of the area east of Aqaba: indicators of reactivation and neotectonic activity   总被引：1，自引：1，他引：0  

Abdullah Ali Diabat 《Arabian Journal of Geosciences》2013,6(3):679-695

This study is based on measurement of hundreds of fractures (small faults, joints, cracks) in the crystalline rocks (Precambrian) and in Quaternary deposits of the investigated area east of Aqaba. Fault-slip data, joints, and any weakness zone data from the study area were collected from 20 stations. These stations represent wadi cliffs, stream channels, alluvial fans in the Pleistocene to Holocene sediments, and granitic rocks. During this study, it was assumed that any discontinuity in granitic rocks is a plane of weakness neoformed or inherited and reactivated during the successive tectonic phases. Whereas any cracks, joints, or small displacement in the Pleistocene and Holocene deposits are assumed to represent the activity or, more recently, deformation of the local area where they found. This study found the main trends of weakness zones, the kinematics, and the relation to main stress field in the region. Results show that the Late Neoproterozoic structures were reactivated during the Cenozoic and controlled the recent movement along the Dead Sea Rift. The NNE to N-S trend sets explain the reactivation of the late Neoproterozoic structures during Tertiary times. On the other hand, the formation of the Dead Sea Transform during the Miocene occurred along the N-S to NNE-SSW trending fault system, which was reactivated as sinistral fault.  相似文献   

An application of three-dimensional electrical resistivity imaging for the detection of an underground waste-water system     

Ahmad Neyamadpour  Samsudin Taib  W. A. T. Wan Abdullah 《Studia Geophysica et Geodaetica》2009,53(3):389-402

A 3D electrical resistivity imaging survey is presented in this paper. The objective was to investigate an underground wastewater system at the University of Malaya, Malaysia. Apparent resistivity data were collected along ten parallel lines using a Wenner-Schlumberger configuration; electrode cables were oriented in the x-direction with 3 m spacing. Roll-along measurements using a line spacing of 3 m were carried out covering a grid of 20 × 10 electrodes. All data sets were merged into a single data file in order to perform a 3D inversion. Two different 3D least squares algorithms, based on the robust inversion method and the smoothness-constrained technique, were used for the inversion of the apparent resistivity data. Both the horizontal and vertical extents of the anomalous zones found by inversion are displayed. The results indicate the superiority of the robust inversion method over the smoothness-constrained technique at this site. The results are in sufficient accordance with previously known information about the investigation area. The results show that 3D electrical resistivity imaging surveys, in combination with an appropriate 3D inversion method, can be highly useful for engineering and archaeological investigations as well as for environmental applications.  相似文献   

Segmentation algorithm for long time series analysis   总被引：2，自引：2，他引：0  

Abdullah Gedikli  Hafzullah Aksoy  N. Erdem Unal 《Stochastic Environmental Research and Risk Assessment (SERRA)》2008,22(3):291-302

Time series analysis is an important issue in the earth science-related engineering applications such as hydrology, meteorology and environmetrics. Inconsistency and nonhomogeneity that might arise in a time series yield segments with different statistical characteristics. In this study, an algorithm based on the first order statistical moment (average) of a time series is developed and applied on five time series with length ranging from 84 items to nearly 1,300. Comparison to the existing segmentation algorithms proves the applicability and usefulness of the proposed algorithm in long hydrometeorological and geophysical time series analysis.  相似文献   

Investigation of the deep structure of the Sivas Basin (innereast Anatolia, Turkey) with geophysical methods     

K. Mert Onal  Aydin Buyuksarac  Attila Aydemir  Abdullah Ates 《Tectonophysics》2008,460(1-4):186-197

Sivas Basin is the easternmost and third largest basin of the Central Anatolian Basins. In this study, gravity, aeromagnetic and seismic data are used to investigate the deep structure of the Sivas Basin, together with the well seismic velocity data, geological observations from the surface and the borehole data of the Celalli-1 well. Basement depth is modeled three-dimensionally (3D) using the gravity anomalies, and 2D gravity and magnetic models were constructed along with a N–S trending profile. Densities of the rock samples were obtained from the distinct parts of the basin surface and in-situ susceptibilities were also measured and evaluated in comparison with the other geophysical and geological data. Additionally, seismic sections, in spite of their low resolution, were used to define the velocity variation in the basin in order to compare depth values and geological cross-section obtained from the modeling studies. Deepest parts of the basin (12–13 km), determined from the 3D model, are located below the settlement of Hafik and to the south of Zara towns. Geometry, extension and wideness of the basin, together with the thickness and lithologies of the sedimentary units are reasonably appropriate for further hydrocarbon exploration in the Sivas Basin that is still an unexplored area with the limited number of seismic lines and only one borehole.  相似文献   

Temperature-based estimation of global solar radiation using soft computing methodologies     

Kasra Mohammadi  Shahaboddin Shamshirband  Amir Seyed Danesh  Mohd Shahidan Abdullah  Mazdak Zamani 《Theoretical and Applied Climatology》2016,125(1-2):101-112

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GIS-based approach for flood analysis: case study of Keçidere flash flood event (Turkey)     

Isa Curebal  Recep Efe  Hasan Ozdemir  Abdullah Soykan  Süleyman Sönmez 《国际地球制图》2016,31(4):355-366

The purpose of this study is to explain the formation mechanism of the floods which occurred in the Keçidere basin in 2009. In this study, discharge data in between 1981 and 2009, digital elevation model (DEM), satellite images and field works were used as a main data sources. LPT3 was applied to 29-year maximum flow data to produce different flood return periods such as 2, 5, 50, 100, 200, 500 and 1000-year flood. The DEM was created using 1:25,000 topographic contours with Topo to Raster interpolation techniques in geographical information systems (GIS). Land use and some geometric data were digitized using high resolution satellite images for hydraulic modelling purposes. Simulation of the 2009 flash flood event and different return periods flow data was done using one-dimensional hydraulic modelling with HEC-RAS. In the last phase, results obtained from the simulations and field works were compared based on fits statistics and mean absolute error in terms of extent and depth. An analysis of water extent and depth features observed during the highest flow ever measured in the basin revealed that the result overlapped with 500-year inundation extent. Overall, the results of the research indicate that GIS is an effective environment for floodplain mapping and analysis.  相似文献   

Inversion of quasi-3D DC resistivity imaging data using artificial neural networks   总被引：2，自引：0，他引：2  

Ahmad Neyamadpour  W. A. T. Wan Abdullah  Samsudin Taib 《Journal of Earth System Science》2010,119(1):27-40

The objective of this paper is to investigate the applicability of artificial neural networks in inverting quasi-3D DC resistivity imaging data. An electrical resistivity imaging survey was carried out along seven parallel lines using a dipole-dipole array to confirm the validation of the results of an inversion using an artificial neural network technique. The model used to produce synthetic data to train the artificial neural network was a homogeneous medium of 100Ωm resistivity with an embedded anomalous body of 1000Ωm resistivity. The network was trained using 21 datasets (comprising 12159 data points) and tested on another 11 synthetic datasets (comprising 6369 data points) and on real field data. Another 24 test datasets (comprising 13896 data points) consisting of different resistivities for the background and the anomalous bodies were used in order to test the interpolation and extrapolation of network properties. Different learning paradigms were tried in the training process of the neural network, with the resilient propagation paradigm being the most efficient. The number of nodes, hidden layers, and efficient values for learning rate and momentum coefficient have been studied. Although a significant correlation between results of the neural network and the conventional robust inversion technique was found, the ANN results show more details of the subsurface structure, and the RMS misfits for the results of the neural network are less than seen with conventional methods. The interpreted results show that the trained network was able to invert quasi-3D electrical resistivity imaging data obtained by dipole-dipole configuration both rapidly and accurately.  相似文献   

Lithosphere dynamics and sedimentary basins: the Arabian plate and analogues     

François Roure  Magdalena Scheck-Wenderoth  Abdullah Gahnoog  Tim Pharaoh 《Arabian Journal of Geosciences》2010,3(4):327-329

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