杭州湾地区浅层生物气资源量计算及其地质意义

doi:10.11743/ogg20050623

Abstract

Abstract:

Late Quaternary gas source rocks in Hangzhou Bay are mainly of flood-plain and shallow marine fa-cies.The total amount of gas generated from the source rocks in flood-plain facies is estimated to be 103.252 BCM,with the total adsorbed gas 27.466 BCM,total dissolved gas 69.31 BCM,total diffused gas 429 MCM,and total free gas 6.047 BCM.While those from the source rocks in shallow marine facies are 141.275BCM,55.668 BCM,74.983 BCM,1.028 BCMand 9.596 BCM,respectively.These estimations show that the biogas generated in shallow layers in the study area would have first been dissolved in formation water and adsorbed by clays,and most of the gas dissolved in water in clay layers would migrate in the form of dissolved gas.Free methane can appear only when it has been saturated in the formation water.Free gas mainly occurs in the inter-granular spaces of sediments.The amount of free gas migration in shallow layers is much smaller than that of dissolved gas.The amount of free gas in flood-plain facies is less than that in shallow marine facies.The total amount of adsorbed gas in shallow marine facies sediments is over twice as large as that in flood-plain facies sediments,while the amount of adsorbed gas in mudstone is over 18 times of that in sandstone.All these indicate that preservation of methane is related to the grain sizes of sediments in shallow layers,and small grain size and large specific surface area are favorable for adsorption of methane. These estimates also indicate that Hangzhou Bay has large potentials for exploration and development of shallow biogas.

Key words: shallow biogas, resources, evaluation, Hangzhou Bay

CLC Number:

TE122.1

Lin Chunming, Zhuo Hongchun, Li Guangyue, Chen Haiyun. Estimates of shallow biogas resources in Hangzhou Bay area and its geological implications[J]. Oil & Gas Geology, 2005, 26(6): 823-830,839.

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Estimates of shallow biogas resources in Hangzhou Bay area and its geological implications

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