Gas Seepage

There also are major sources of organic compounds from nature. Methane is a major emission from the natural environment and in non-urban atmospheres concentrations generally range between 1-1.5 ppm (6). The major source of atmospheric methane is the decomposition of organic material in swamps, marshes, and other bodies of water. Natural gas seepage possibly significantly contributes methane to the atmosphere in certain petroleum areas. It is estimated that natural sources of methane are about 1600 X 10 tons annually (7). [Pg.6]

In a very extensive review. Price (1985) suggested that surface bacterial activity can totally obliterate the gases in a microseep. That this is not typically the case has been demonstrated by extensive research over both macroseeps and microseeps (Jones, 1984). However, bacterial activity does probably contribute to the noisy appearance of soil-gas seepage. [Pg.152]

Dando, P.P., O Hara, S.C.M., Schuster, U., Yaylor, L., Clayton, C.J., Bayliss, S. and Laier, T., 1994. Gas seepage from a carbonate-cemented sandstone reef on the Kattegat coast of Demnark. Marine Pet. Geol., II 182-189. [Pg.478]

Simpson, C.J., Wilford, J.R., Macias, L.F. and Korsch, R.J., 1991. Remote sensing of petroleum gas seepage alteration, Palm Valley gas field, Amadeus basin, central Australia. Proc. Eighth Thematic Conference on Geologic Remote Sensing, Denver, pp. 1463-1472. [Pg.504]

Zhao Yangsheng, Hu Yaoqing, Yang Dong and Wei Jingping, 1999b, The experimental study on the gas seepage law of rock related to adsorption under 3-D stresses, Chinese J. Rock Mech. Eng., Vol.18, No.6, pp.651-653... [Pg.90]

It is a well-established fact that the description of the interaction between coal/rock mass and gas in the gas leak flow system is difficult. Nonetheless, the problem of gas leak flow must be studied for the sake of coal mining safety and gas drainage in the multi-coal-seam. In this study the gas leak flow systems for coupled coal/rock mass deformation and gas seepage in double coal seams are studied with the principle of rock mechanics and coal gas seepage. [Pg.623]

With the mathematical modeling of coal gas seepage, the discretizating of the gas by numeri-... [Pg.250]

Li Hongyan 2008, Status-quo and Tendency of Research on Coupling Theory of Mining Stress Field and Gas Seepage Field. Coal Mining Technology, 13(3) 4-7. [Pg.368]

According to Darcy s law, the gas pressure gradient of coal seam is proportional to the gas seepage velocity(Wang Ji-ren 2005, Xu Xue-feng 2003, Sun Jing-lai 2009). Its expression is ... [Pg.1045]

In the formula, q is gas seepage velocity, A is permeability coefficient of coal seam, dptdx is gas pressure gr ient along the seepage direction. [Pg.1045]

The expression of gas seepage coefficient of coal seam (Sun Jing-lai 2009, Wang Yan-sen 2004, Yang Tian-hong) is ... [Pg.1046]

Yin Guang-Ai, Li Xiao-quan, Zhao Hong-bao, etc 2008. Experimental research on effect of gestures on outburst coal s gas seepage. Chinese Journal of Rock Mechanics and Engineering, 27(12) 2557-2561. [Pg.1050]

Zhou Dong-ping, Shen Da-fu, Yu Mo-hua, Guo Chen-ye 2008. Experimental Study on Influence of Strata Stress upon Gas Seepage Characteristics.[J]. Ming safety and environmental protection, 39(8) Supplement 6-12. [Pg.1050]

Where Q = Gas seepage flow Pa = the atmospheric pressure L = Length of the specimen PI = Specimen inlet gas pressure P2 = Specimen export gas pressure A = he cross-sectional area of specimen = the gas viscosity coefficient. [Pg.1052]

Jin Longzhe, et al. 2010. CFD simulation of gas seepage regularity in goaf Journal of China Coal Society, 35(9) 1476-1480. [Pg.1086]

The drawdown and distribution capability was designed to be 4.3 MBO/day for 90 days. Gas seepage and sale or transfer of 69 MBO from the Week Island site, which was decommissioned during 1996, reduced the drawdown capacity to 3.7 MBO/day by the spring of 1998. [Pg.82]

Decomposition of organic matter, release from oceans, fossil-fuel combustion Decomposition of organic matter, industrial processes, fossil-fuel combustion Decomposition of organic matter, natural-gas seepage, livestock emissions Atmospheric electrical discharges, internal combustion en es, combustion of organic matter... [Pg.751]

Methane, CH4 Decomposition of organic matter, natural-gas seepage, livestock emissions 1.82 ppm throughout troposphere... [Pg.777]

Keywords sintering mix, permeability, on-line test, gas seepage Abstract... [Pg.517]

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