![]() Thus, shale gas can be seen as a new unconventional source of energy (Kok and Merey 2014 Shar et al. However, the technological advancements that have taken place in the past few decades have led to an increased reliability on taking production from these unconventional resources (Sunjay and Kumar 2014). Initially, the production of natural gas from these lesser-known reservoirs was not considered profitable due to the low permeability issues. Getting such a fuel extracted from a new unconventional source can help in meeting the high energy demands all over the world. Natural gas, when compared to other fuels, is much more eco-friendly. Natural gas extracted from shale nowadays is a much sought-after resource that has a possibility of meeting such needs. An energy resource is required, which is much less damaging to the environment and can meet the high energy requirements simultaneously. It is also clear that while these resources have great potential to meet global energy needs, there is still a long way to go to capture full advantage of these resources (Ellabban et al. Even if it was possible, the costs would be so high that they cannot be afforded at every place. Not only this but, with current technological advancements, it is not easy to extract the maximum amount of energy contained in these sources. The same may be the case with hydropower or ocean thermal energy. One can easily understand that it is not possible to harness wind energy in every part of the world. While there is an enormous amount of research and development put into renewable sources of energy like solar, wind, and hydropower, one common problem that exists with these is feasibility and efficiency. The inclination toward using more sustainable forms of energy is undeniable. There are significant consequences of the energy usage on the local pollutants and the emission of greenhouse gases. Another critical factor is the environmental aspect. Now, as the demand keeps on increasing the energy supply too needs to upsurge in coherence. Global development, following the developing world, suggests household income increase, which requires more energy use, greater access to transport networks and services (Wolfram et al. There is a significant rise in energy usage as the population continues to grow. Over the past few decades, global demand for energy has multiplied. It is perhaps impossible to imagine a world where there were no fossil fuels. The non-renewable fuels (natural gas, oil, and coal) right after their discovery have controlled the world energy supplies finding a place in residential, commercial, industrial, and even transportation sector. Along with the problems, the technically recoverable reserves of different countries, different production mechanisms, and economic aspects of shale gas are also discussed. ![]() Depending on the recoverable reserve (RR), production of shale gas entails different methods and with a different method, comes different problems described and discussed in this manuscript. Shale production depends on many factors such as political matters, wars, social and economic aspects, and exploration techniques. India has overall reserves of shale gas between 6 TCF, of which 63 TCF is of recoverable shale gas (Pradhan and Prakash 2000). Shale gas deposits are scattered all over the planet in low-permeability and low porosity reservoirs. Shale gas is one of the unconventional sources of energy. Increase in production of non-renewable energy source, i.e., the fossil fuels may help to fulfill the energy requirement of future generations. The feasibility and the current efficiency of renewable energy sources may not be capable of satisfying the world energy demand by themselves. ![]() With conventional and unconventional reserves depleting, demand for energy supply is rising. The world energy consumption is going to rise by nearly 50% in 2050 when compared to 2010.
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