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The AAPG/Datapages Combined Publications Database

Journal of Petroleum Geology

Abstract

Journal of Petroleum Geology, Vol.8, No.4, pp. 405-422, 1985

┬ęCopyright 2000 Scientific Press, Ltd.

CONCEPTS ON THE GENERATION AND ACCUMULATION OF BIOGENIC GAS

Zhang Previous HitYiTop Gang and Chen Huan Jiang*

* Central Laboratories of Petroleum Geology, Ministry of Geology and Mineral Resources, P.O. Box 916, Wuxi, Jiangsu, The People's Republic of China.


Abstract

To help in the search for biogenic gas, parameters affecting its spatial and temporal distribution are delineated here on the basis of recent developments in microbiology and geochemistry. Methane is produced and dissipated at high rates in uppermost sediments. The key to its accumulation lies in the presence of factors which inhibit the metabolism of bacterial methanogens near the surface, and leave them to flourish at greater burial depths. Favourable controlling factors are as follows: a plentiful nutrient supply (mainly carbohydrates), a high SO4 -content in the bottom water; a post-oxic sedimentary environment; frequent transgressions and regressions; low temperatures; high pH values; and high depositional rates and pressures.

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