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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
Abstract
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Krooss, B. M., and D. Leythaeuser, 1996, Molecular diffusion of light hydrocarbons in sedimentary rocks and its role in migration and dissipation of natural gas, in D. Schumacher and M. A. Abrams, eds., Hydrocarbon migration and its near-surface expression: AAPG Memoir 66, p. 173-183. | ||||||||||||
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Secondary migration is dominated by volume flow, and diffusion plays only a subordinate role. Diffusion may be important in the dismigration of natural gas if seal leakage by volume flow does not occur over extended periods of time. Average diffusive fluxes for methane through seals reported in various studies range from 0.16 to 89 m3/km3/year. For comparison, the compressible volume flow of gas through a shale 50-450 m thick with a permeability of 1 nanodarcy (10-21 m2) was calculated between 100 and 1000 m3/km3/year. Numerical simulation of diffusion in the context of integrated two-dimensional basin modeling improves the quantification of molecular transport of hydrocarbon gas in petroleum systems. |
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