Methane, Gas Hydrates - GS questions based on daily current affairs

ANSWER: Gas with no or very low Hydrogen Sulphide

Explanation:

• Sweet Gas is a Natural gas that does not contain hydrogen sulfide [H2S].
• The gas may also not contain any quantities of carbon dioxide.
• The composition of the gas determines whether it is sweet or sour.
• Sweet Gas in its purest form can be used with very little refining. It is not corrosive in nature; hence it is relatively easy to use as compared to sour gas.
• Coal Bed Methane is Sweet Gas

ANSWER: Only 1

Explanation:

• Coalbed methane is distinct from a typical sandstone or other conventional gas reservoir, as the methane is stored within the coal by a process called adsorption.
• The methane is in a near-liquid state, lining the inside of pores within the coal (called the matrix).
• The open fractures in the coal (called the cleats) can also contain free gas or can be saturated with water.
• Gas contained in coal bed methane is mainly methane and trace quantities of ethane, nitrogen, carbon dioxide and few other gases.
• Intrinsic properties of coal as found in nature determine the amount of gas that can be recovered.

ANSWER: Only 2

Explanation:

• Coalbed methane (CBM or coal-bed methane), coalbed gas, coal seam gas (CSG), or coal-mine methane (CMM) is a form of natural gas extracted from coal beds.
• In recent decades it has become an important source of energy in United States, Canada, Australia, and other countries.
• The presence of this gas is well known from its occurrence in underground coal mining, where it presents a serious safety risk.
• Unlike much natural gas from conventional reservoirs, coalbed methane contains very little heavier hydrocarbons such as propane or butane, and no natural-gas condensate. It often contains up to a few percent carbon dioxide.