Analysis of gravity field to reconstruct the structure of Omo basin in SW Ethiopia and implications for hydrocarbon potential

Mammo, Tilahun

doi:10.1016/j.marpetgeo.2011.08.013

Cited by 23 publications

(16 citation statements)

References 30 publications

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“…Although the oil has only been discovered deep in Kenya's portion of Turkana land for now, the entire region might be awash in oil reserves, given their shared geology in the rift valley. The international conflicts which are likely to arise or worsen from anticipated competition to carve this territory out for oil exploration will likely put more distress on the already marginalized Turkana pastoralists and add cross-border insecurity Bevan, 2008;Bush, 1995;Fratkin et al, 2004;Krätli & Swift, 1999;Markakis, 1993;Ndanyi, 2011Ndanyi, , 2012Ngâasike, 2011;Pragya, 2012 Bosshard, 2013;Hauser, 2012;Johannes, 2011;Kiragu, 2013;Kisero, 2012;Le Billon, 2001, 2006Mammo, 2012;Ndanyi, 2012;Ng'etich, 2012;Okoth, 2012;Oredein, 2013;Senelwa, 2012;Thurston, 2012;Tiercelin et al, 2012;Okumu, 2013 to an already volatile region. The question will then be, which demarcation line to use in establishing a consensual international boundary that resolves the dispute -the 1938 'red line' which Kenya currently prefers, the 1947 'blue line,' Sudan's 1950 patrol line (green in Figure 5(b)), or some other boundary.…”

Section: Local and International Sources Of Conflict And Stabilitymentioning

confidence: 99%

Oil discovery in Turkana County, Kenya: a source of conflict or development?

Johannes

Zulu

Kalipeni

2014

African Geographical Review

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The recent discovery of oil in Turkana County in Kenya has brought to the forefront the plight of the Turkana people, a marginalized pastoralist group in semi-arid northwestern Kenya. Oil discovery has ignited considerable new-found interest in this neglected region by nonlocal Kenyan and foreign actors. Specifically, we use the resource curse framework to examine major drivers, impacts, and local perceptions of resource-based conflicts generally, and impacts of added vulnerabilities, risks, and opportunities introduced by the recent discovery and development of oil in Turkana County. Our preliminary observations indicate that the Turkana, on top of pre-existing and increasingly militarized interethnic and cross-border conflicts primarily driven by competition over scarce pasture and water resources, are likely to face the dreaded 'oil curse' that has brought untold devastation on the livelihoods of communities elsewhere in Africa. The central argument in this paper is that the recent discovery of oil will exacerbate pre-existing tensions and likely result in full-blown violent conflicts among the already marginalized Turkana against local and foreign investors such as Tullow Oil that are now converging on local towns of Lodwar and Lokichar in Turkana, unless effective and timely preventive and corrective action is taken.

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Section: Local and International Sources Of Conflict And Stabilitymentioning

confidence: 99%

Oil discovery in Turkana County, Kenya: a source of conflict or development?

Johannes

Zulu

Kalipeni

2014

African Geographical Review

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“…Therefore, the variations of residual gravity anomaly indicate the compartmentalization of the Cauvery Basin into sub-basins as demarcated by yellow rectangular in Figure 6. It indicates that the basement structure has controlled the distribution of gravity anomalies (e.g., Dickson et al, 2003;Mammo, 2012;Radhakrishna et al, 2012;Tong et al, 2018).…”

Section: Reconstruction Of the Basin Architecturementioning

confidence: 99%

“…The processoriented gravity modeling in the marine area using the short wavelength residual anomalies and long wavelength regional anomalies have become considerably important in hydrocarbon exploration and oceanography. Petroleum exploration companies use typically gravity data to determine the architecture of frontier offshore sedimentary basins during the reconnaissance survey (e.g., Ravaut et al, 1998;Mammo, 2012;Radhakrishna et al, 2012;Tong et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Determination of the regional and residual gravity anomalies to reconstruct basin structures of the Cauvery Basin

Bandara

Weerasinghe²,

Ratnayake

2020

J. Geol. Soc. Sri Lanka

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The measured gravity field of the Earth contains two main components of short wavelength residual anomalies and long wavelength regional anomalies. In the petroleum industry, the most important component is the residual anomalies which correlate with the shallow density variations in sedimentary basins. The regional anomalies are caused by deeper density contrasts in the lithospheric mantle and the Asthenosphere. The current study is focused to determine residual and regional gravity anomalies for understanding basin architecture of the Cauvery Basin. In this study, the basement of the Cauvery Basin was determined using two-way-travel time seismic data and well log data obtained from eight exploration wells. Depth data from selected 2D sections were used as input data for a Mathematica® program which developed based on the iterative algorithm to calculate the residual gravity anomaly caused by a 2D polygonal body having a density contrast with the surrounding. The difference of the calculated and the observed gravity was then used to obtain the regional gravity along the arbitrary survey lines. Results show that the regional gravity ranged from about -50 mGal to 70 mGal with having a relatively high gravity anomaly in the central part of the Cauvery Basin. According to the regional tectonic settings, the high gravity anomaly can indicate a crustal thinning process that occurred during the rifting phase of the basin. The residual gravity anomaly of the Cauvery Basin ranged from about -60 mGal to 20 mGal and it follows the horst and graben structures. In summary, several undiscovered sub-basins were identified related to the rifting of (i) East-West Gondwana (ca. 167 Ma, NE-SW trending structures) and (ii) the East India-Antarctica (ca. 137 Ma, NW-SE trending). Therefore, this study can be productively used for mapping the structural elements and architecture in terms of considering the most favorable locations for future hydrocarbon exploration in the Cauvery Basin.

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“…It was, we think, still uninterrupted by the Korath Range, for which we still have only one date of 91±15 ka (Jicha and Brown, 2014) on one of the younger flows. Most deposition for the past 4 Ma has been on either side of a basement high that runs down the center of the low area (Mammo, 2012), with the Korath Range as a constructional feature near the north end of the basement high.…”

Section: Geologic Settingmentioning

confidence: 99%

Gigantic lion, Panthera leo, from the Pleistocene of Natodomeri, eastern Africa

Manthi¹,

Brown²,

Plavcan³

et al. 2017

J. Paleontol.

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Abstract.-The partial skull of a lion from Natodomeri, northwest Kenya is described. The Natodomeri sites are correlated with Member I of the Kibish Formation, dated to between 195 ka and ca. 205 ka. The skull is remarkable for its very great size, equivalent to the largest cave lions (Panthera spelaea [Goldfuss, 1810]) of Pleistocene Eurasia and much larger than any previously known lion from Africa, living or fossil. We hypothesize that this individual represents a previously unknown population or subspecies of lion present in the late Middle and Late Pleistocene of eastern Africa rather than being an indication of climate-driven size increase in lions of that time. This raises questions regarding the extent of our understanding of the pattern and causes of lion evolution in the Late Pleistocene.

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Analysis of gravity field to reconstruct the structure of Omo basin in SW Ethiopia and implications for hydrocarbon potential

Cited by 23 publications

References 30 publications

Oil discovery in Turkana County, Kenya: a source of conflict or development?

Oil discovery in Turkana County, Kenya: a source of conflict or development?

Determination of the regional and residual gravity anomalies to reconstruct basin structures of the Cauvery Basin

Gigantic lion, Panthera leo, from the Pleistocene of Natodomeri, eastern Africa

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