1. The relationship between natural gas, coal-bed methane and shale gas.
The natural gas is called the conventional natural gas, and the coal bed gas and shale gas are called the unconventional natural gas. The nature of the natural gas is natural gas, that is, the natural gas is natural gas. All of them are buried in the sedimentary strata, and the fossil fuels formed by the geological action are all natural and clean energy sources. This is their common point.
1. the conventional natural gas (Natual gas) is a multi component mixed gaseous fossil fuel, which is mainly composed of methane (CH4), and a small amount of ethane, propane and butane. The composition is relatively complex, with a specific gravity of about 0.65, lighter than air, and has the characteristics of colorless, tasteless and non-toxic.
2. coal bed gas (coalbed) is commonly known as "gas", the main component is methane, the composition is relatively simple, is basically not transported out of the coal seam, in order to adsorb and dissociate the coal seam and its surrounding rock coal gas. Its calorific value is 2 to 5 times that of general coal, and there is almost no pollutant after combustion.
3. shale gas is a natural gas extracted from shale, mainly composed of methane.
Two. Differences between natural gas, coal bed methane and shale gas three.
1. Conventional natural gas is mainly free-hosted, and it is stored in underground porous strata, mainly in oilfields and natural gas fields, but also a little out of coal fields. The mining method usually uses self injection method for gas production and drainage gas recovery, and the mining technology is relatively simple.
2. the characteristics of coalbed gas storage are hydrocarbon gases, which are mainly adsorbed on the surface of coal matrix particles, partially dissociated in the pores of coal and surrounding rock or dissolved in coal seam water during the process of coal formation. Generally speaking, there are two ways of exploitation: first, surface drilling and exploitation; second, gas drainage system is pumped out of the well, which is a little higher than natural gas exploitation.
3. The hydrocarbon-generating conditions and process of formation of rock-bed gas reservoir are the same as that of conventional natural gas. Shale gas reservoir has the characteristics of self-generation and self-storage. Shale is both source rock and reservoir rock. Its exploitation is large (because shale gas reservoir permeability is low), mainly horizontal well technology and multi-layer fracturing technology.
Compared with the conventional natural gas, the shale gas has the advantages of long mining life and long production cycle, and it has a wide range of distribution and large thickness, which can produce gas for a long time. Therefore, the exploitation technology of shale gas is developing quickly at present.
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