With reference to two non-conventional energy sources called ‘coalbed methane’ and ‘shale gas’, consider the following ‘statements: (1). Coalbed methane is the pure methane gas extracted from coal seams, while shale gas is a mixture of propane and butane only that can be extracted from fine-grained sedimentary rocks. (2). In India abundant coalbed methane sources exist, but so far no shale gas sources have been found. Which of the statements given above is/are correct?

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CollectorBabu · Accepted Answer

Correct Answer: Neither 1 nor 2. Coalbed methane is a form of natural gas extracted from coal beds and contains very little heavier hydrocarbons: propane or butane while Shale gas is made up of methane. Statement 1 is incorrect as Coalbed methane is a form of natural gas extracted from coal beds and has butane and propane as hydrocarbons, while shale gas carries methane and not a mixture of propane and butane. In India, shale reserves are there in Cambay, Assam-Arakan, Gondwana, Krishna Godavari, Kaveri and Indo Gangetic plain, while Coalbed methane is only available at Asansol in West Bengal, so statement 2 is also incorrect. Since both statements 1 and 2 are incorrect, so option D is right choice.

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