scholarly journals Resolving fractured debates about fracking? The shale gas industry in South Africa

2016 ◽  
Vol Volume 112 (Number 11/12) ◽  
Author(s):  
John Butler-Adam ◽  
Keyword(s):  
2019 ◽  
Vol 18 (2) ◽  
pp. 1-34 ◽  
Author(s):  
R Wait ◽  
R Rossouw

It has been said that the development of a shale gas industry could be a ‘game changer’ for South Africa. Proponents of shale gas tend to emphasise the benefits, whilst opponents emphasise the environmental costs. This paper is an attempt to inform the policy debate by highlighting both the potential economic benefits and environmental costs. To date, the Econometrix report (published in 2012) provides the only estimate of the economic impacts that may emanate from developing the Karoo’s shale gas. The report uses a Keynesian multiplier model to estimate the impacts. The analysis performed in this paper estimates the economic impacts using a Computable General Equilibrium (CGE) modelling approach, and the results are compared to the findings of the Econometrix report. In doing so, this paper provides an expanded view of the potential economic impact. Accordingly, this paper provides a number of findings on the estimated economic impact of shale gas extraction – based on the application of an economy-wide impact modelling methodology – which should be of interest to both opponents and proponents of the shale gas industry. By including all possible results, such as a boost in public sector jobs and an analysis of the impact on consumer prices and jobs in other sectors, this paper expands the current understanding of the likely impact of shale gas extraction in the Karoo of South Africa.  


Author(s):  
V. Nengovhela ◽  
B. Linol ◽  
L. Bezuidenhout ◽  
T. Dhansay ◽  
T Muedi ◽  
...  

Abstract Contact metamorphism along widespread dolerite sills and dykes, emplaced at 182 to 183 Ma through the sedimentary host rocks of the Karoo Basin, triggered devolatilization of carbon-rich shales of the Lower Ecca Group. Hornfel samples collected from drill cores that intersect dolerite sills were analyzed for mineral phase equilibria, chemistry and porosity to characterize thermal aureoles at various distances from sill intrusions. Andalusite-chiastolite and cordierite porphyroblasts with biotite and muscovite occur within 10 to 20 m of many intrusive contacts. These metamorphic minerals crystallized when host shales attained maximum temperatures ranging between 450 and 600°C. Scanning electron microscopy imaging confirms that the hornfels are compact and that their metamorphic minerals limit porosity along grain boundaries. In few cases intra-mineral porosity occurs within individual crystals such as calcite, andalusite and cordierite. Disequilibrium metamorphic textures such as irregular grain boundaries, and inclusions in andalusite and cordierite reveal that the elevated temperatures were too short-lived to accomplish complete (re)crystallization. Thermal modeling results are consistent with the observed metamorphic mineral assemblages. Gas leakage calculations along a 7 m and a 47 m thick dolerite sill that intrude toward the top of the Whitehill Formation suggest that methane volumes ranging between 8 to 15 Tcf were generated during the sill emplacement. Methane was likely released into the atmosphere through hydrothermal vent complexes that are well preserved in the western Karoo Basin. If such loss was widespread across the entire basin, the implications for paleo-climate change and preserved shale gas reserves in the Karoo Basin of South Africa would be significant.


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