Genetic Types and Accumulation Conditions of Biogas in Bohaiwan Basin
Received date: 2010-08-28
Revised date: 2010-10-23
Online published: 2011-06-10
Great volumes of biogases have been found in the Bohaiwan basin.But they are small and fragmented distribution,with multi\|genetic types.In this paper,based on gas geochemical characteristic and geological background,the biogases in the Bohaiwan basin are divided into two types of source rock-and hydrocarbon-derived biogases.The source rock-derived biogases are subdivided into primary and secondary biogases,and the hydrocarbon\|derived biogas could be subdivided into anaerobic degradation biogas and aerobic degradation biogases.Complex geological conditions make the genetic types of biogas in the Bohaiwan basin mixing.The coexistence of biogas and thermogenic gas occurs in some of biogas reservoirs.By mean of understanding the conditions of biogas source,reservoir,trap and preservation in the Bohaiwan basin,we consider that the Bohaiwan basin have sufficient source of biogas,developed reservoir and suitable trap.The sealing capacity of cap rock,fault activity after Dongying movement is the key for biogas accumulation.
Key words: Bohaiwan basin; Biogas; Genetic types; Accumulation conditions; Secondary biogas.<; p>
GAO Yang, JIN Qiang, SHUAI Yan-Hua, WANG Hao . Genetic Types and Accumulation Conditions of Biogas in Bohaiwan Basin[J]. Natural Gas Geoscience, 2011 , 22(3) : 407 -414 . DOI: 10.11764/j.issn.1672-1926.2011.03.407
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