What is coal seam gas?

coal bed methane
Coal seam gas (CSG), also known as coal bed methane, is a form of natural gas typically extracted from coal seams at depths of 300-1,000 metres. CSG is a mixture of a number of gases, but is mostly made up of methane (generally 95-97 per cent pure methane).

What is a coal seam called?

…into the various kinds of coal: initially brown coal or lignite, then soft or bituminous coal, and finally, with metamorphism, hard or anthracite coal. In the geologic record, coal occurs in beds, called seams, which are blanketlike coal deposits a few centimetres to metres or hundreds of metres thick.

What is the difference between coal bed methane and coal seam gas?

Although CMM is similar to CBM in that it is a subset of the methane found in coal seams, it refers specifically to the methane found within mining areas (e.g., within a mining plan), while CBM refers to methane in coal seams that will never be mined.

What is the difference between coal seam gas and natural gas?

Coal seam gas is natural gas found in coal deposits, typically 300-600 metres underground. Coal seam gas is held in place by water pressure. To extract it, wells are drilled through the coal seams and the water pressure is reduced by extracting some of the water. This releases natural gas from the coal.

What is coal seam gas and how is it extracted?

Coal seam gas is extracted by drilling a well vertically through rock strata until reaching the coal seam, at which point the well may also be drilled out horizontally to increase access to the methane gas. Coal seams contain both water and gas.

What makes a coal seam?

Under the right conditions, peat transforms into coal through a process called carbonization. Carbonization takes place under incredible heat and pressure. About 3 meters (10 feet) of layered vegetation eventually compresses into a third of a meter (1 foot) of coal! Coal seams exist on every continent.

What causes a coal seam?

Coal seams originate and are formed by the consolidation of biota, minerals, and natural chemicals through geologic time. Compression, heat, sedimentation, erosion, and chemical energy are agents of the coal formation process.

How is coal seam gas formed?

Gases in coal seams are formed during the long geological process of coal formation (coalification) when organic matter is converted into coal. The gas accumulates underground, held within the cleats (natural fractures) and pores of the coal itself. Not all coal seams contain useful quantities of methane.

How is coal seam gas extracted?

Coal seam gas is natural gas found in coal deposits, typically 300-600 metres underground. To extract it, wells are drilled through the coal seams and the water pressure is reduced by extracting some of the water. This releases natural gas from the coal.

How does coal seam gas work?

Coal seam gas is held in place by water pressure. To extract it, wells are drilled through the coal seams and the water pressure is reduced by extracting some of the water. This releases natural gas from the coal. In some cases hydraulic fracturing, or ‘fracking’, is used to extract coal seam gas.

Coal seam gas is extracted by drilling a well vertically through rock strata until reaching the coal seam, at which point the well may also be drilled out horizontally to increase access to the methane gas. Coal seams contain both water and gas.

What does coal seam mean?

coal seam (Noun) A stratum of coal between strata of other rocks. How to pronounce coal seam?

Is CBM natural gas?

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 term refers to methane adsorbed into the solid matrix of the coal.

How is coal seam degasification?

A coal seam is degasified in advance of its being mined by drilling one or more generally horizontal holes from a working face into the seam, and placing a particulate propping agent into the borehole