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Palynofacies and Source Rock Potential of the ST-7H Well, Offshore Tano Basin, Western Region, Ghana
D. Atta-Peters,
C. A. Achaegakwo,
D. Kwayisi,
P. Garrey
Issue:
Volume 4, Issue 1, February 2015
Pages:
1-20
Received:
23 December 2014
Accepted:
6 January 2015
Published:
14 January 2015
Abstract: Samples from ST-7H well offshore Tano basin in western region of Ghana have been subjected to palynofacies, palynological and geochemical analysis. Five palynofacies associations (I – V) have been identified based on the percentage relative abundances of the sedimentary organic matter (SOM). Palynofacies type I and type IV reflects deposition in a distal dysoxic-anoxic shelf (nearshore) environment, palynofacies type II suggest distal dysoxic to anoxic shelf to deep basin environment with abundant AOM, palynofacies type III is indicative of distal dysoxic to oxic shelf (fluvio-deltaic) environment of deposition and palynofacies type V, a mud –dominated oxic distal shelf (open marine) environment. Based on marker palynomorphs, an Aptian to Maastrichtian age, have been assigned to the sediments in the ST 7H well, with an unconformity between the Cenomanian and Campanian sediments. Geochemical data indicate that the samples from ST 7H well have fair to very good petroleum potential. Most of the samples, however, fall out of the hydrocarbon generating zone because of the low (< 0.10) Production Index (PI). Kerogen types show type II, II/III and III which are oil prone, oil-gas prone and gas prone respectively. Thermal maturity from within the well indicates immature to early mature hydrocarbons.
Abstract: Samples from ST-7H well offshore Tano basin in western region of Ghana have been subjected to palynofacies, palynological and geochemical analysis. Five palynofacies associations (I – V) have been identified based on the percentage relative abundances of the sedimentary organic matter (SOM). Palynofacies type I and type IV reflects deposition in a ...
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A 2006 Colima Rift Earthquakes Series and Its Relationship to the Rivera-Cocos Plate Boundary
Jaime Yamamoto,
Zenón Jiménez
Issue:
Volume 4, Issue 1, February 2015
Pages:
21-30
Received:
2 December 2014
Accepted:
5 January 2015
Published:
19 January 2015
Abstract: From 31 July through 13 August 2006 a series of fourteen earthquakes (M 3.9 to 6.1) occurred in the western end of the Central Mexican Volcanic Belt (CMVB) in a twenty-five days period. The most prominent earthquake (Mw 6.1) occurred on 11 August 2006 at 14:30 UTC (9:30 local time) approximately at 18.37° N, 101.25° W and 81 km depth. The epicenter was less than 40 km from Huetamo, Michoacan a 41,250-inhabitant city and 60 km from the El Infiernillo dam embayment the third largest hydroelectric plant in Mexico. This earthquake was widely felt with minor to moderate reported damage. In Mexico City 250 km away from the epicenter the earthquake produced alarm among the population and several buildings were evacuated. The earthquakes series developed into two activity clusters one centered in the coast and separated about 300 km from a second inland cluster. The initial coastal cluster consisted of a nearly linear activity distribution, which includes shallow-depth earthquakes of reverse and normal faulting mechanisms. The inland cluster shows more compact and deeper hypocenters distribution. Earthquakes first-motion polarities indicate that ruptures occurred as a normal faulting, which is a characteristic of the CMVB earthquakes. The overall trend of earthquakes distribution shows two branches, one, along the El Gordo-Colima graben system direction (~N45°E) nearly perpendicular to the coast and another along an east-west direction parallel to the southern border of the CMVB. Our results indicate that these two branches might constitute part of the continental extension of the Rivera-Cocos plate boundary.
Abstract: From 31 July through 13 August 2006 a series of fourteen earthquakes (M 3.9 to 6.1) occurred in the western end of the Central Mexican Volcanic Belt (CMVB) in a twenty-five days period. The most prominent earthquake (Mw 6.1) occurred on 11 August 2006 at 14:30 UTC (9:30 local time) approximately at 18.37° N, 101.25° W and 81 km depth. The epicenter...
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Long-Range Anomalous Electromagnetic Effect Related to M9 Great Tohoku Earthquake
Dragos Armand Stanica,
Dumitru Stanica,
Nicoleta Vladimirescu
Issue:
Volume 4, Issue 1, February 2015
Pages:
31-38
Received:
7 January 2015
Accepted:
14 January 2015
Published:
26 January 2015
Abstract: It is supposed that prior to a large earthquake its focus may send through the Earth lithosphere a long-range effect of strain-related to transient electric signals, which in turn give rise to geomagnetic variations propagated over a wide range of frequencies. Consequently, to confirm long-range electromagnetic anomalous effect related to the M9 Great Tohoku earthquake occurred on 11 March 2011, we retrospectively analyzed the geomagnetic data collected at three observatories placed in Japan (Memambetsu, Kakioka) and Romania (Provita de Sus). The daily mean distributions of the normalized function Bzn and its standard deviation (STDEV) for all the three observatories are performed in the ultra-low frequency range (0.001-0.016Hz) by using the FFT band-pass filter analysis. Additionally, a comparative statistical analysis, based on a standardized random variable equation, was applied to the Bzn time series to emphasize a possible pre-seismic anomalous interval and, consequently, a peak greater than 2.5∙STDEV, related to the M9 Tohoku earthquake, was identified on 5-6 February 2011. The lead time was 32 days before the earthquake occurrence. The final conclusion is that the detection area of the pre-seismic electromagnetic effect could be extended to the considerable distances from the epicenter of a giant earthquake.
Abstract: It is supposed that prior to a large earthquake its focus may send through the Earth lithosphere a long-range effect of strain-related to transient electric signals, which in turn give rise to geomagnetic variations propagated over a wide range of frequencies. Consequently, to confirm long-range electromagnetic anomalous effect related to the M9 Gr...
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Modeling Ecotourism Potentials of Karst Springs in GIS Environment: A Case Study of Rijab Mirage in Kermanshah Province, Iran
Behrouz Nasiri,
Mostafa Karampoor,
Parsa Gholami,
Shoaib Abkharabat,
Siamak Ahmadi
Issue:
Volume 4, Issue 1, February 2015
Pages:
39-49
Received:
30 December 2014
Accepted:
13 January 2015
Published:
28 January 2015
Abstract: Mirages of Kermanshah province of Iran including Rijab mirage, with unique features such specific animal and plant species, very suitable climate , roaring waterfalls and etc. currently, as a ecotourism region is used by so Many people And has the capacity to become an ecotourism zone in the province and the country. In this research for feasibility of ecotourism development in mentioned area, first in the identification process, ecologically sustainable sources including vegetation cover, soil, geology and geomorphology has been identified And then in summarization and analysis step data obtained from the previous step, were processed and classified to enter in GIS environment; land surveying was conducted and then it combined with soil map and vegetation cover maps, ecological unit map, which is the base of ecological assessment, is obtained. Unsustainable resources such as water, climate and etc. were also considered.
Abstract: Mirages of Kermanshah province of Iran including Rijab mirage, with unique features such specific animal and plant species, very suitable climate , roaring waterfalls and etc. currently, as a ecotourism region is used by so Many people And has the capacity to become an ecotourism zone in the province and the country. In this research for feasibilit...
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The Neotectonic Activity Along the Lower Khazir River by Using SRTM Image and Geomorphic Indices
Issue:
Volume 4, Issue 1, February 2015
Pages:
50-58
Received:
25 August 2014
Accepted:
28 January 2015
Published:
15 February 2015
Abstract: Lower Khazir River is crossing three mountains (Maqlub , Ain Al-Safra, and Makhmoore) and it is adjustment to the neotectonic activity by fold. During the study evaluate active tectonics by using DEM derived drainage network and geomorphic indices stream-length gradient (SL), basin asymmetry factor (AF), hypsometric integral (HI), valley floor width to valley height ratio (Vf), Basin shape (Bs) and mountain front sinuosity (Smf). Geomorphic indices are calculate (IRAT) in the study site. So I classified the IRAT index into very higher, higher, modern and lower active of tectonic. The value of very higher is in sub basin 1 and 18 , higher is in sub basin 6, 10, 14 and 17 , modern is in sub basin 2,3,4, 5 ,7 , 9 ,16 and 19; and lower is in sub basin 8,11,12,13 and 15. About 10.5% of the study area (about 29.87) km2): 21% (111.63 km2) to Class 2: 42% (312.59 km2) to Class 3 and 26.5% (133.75 km2) to Class 4. IRAT tends to be high along the fold and fault zone. Two different levels of the rock are found in the study site (middle hard and soft rock).
Abstract: Lower Khazir River is crossing three mountains (Maqlub , Ain Al-Safra, and Makhmoore) and it is adjustment to the neotectonic activity by fold. During the study evaluate active tectonics by using DEM derived drainage network and geomorphic indices stream-length gradient (SL), basin asymmetry factor (AF), hypsometric integral (HI), valley floor widt...
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