Simulation experiments on gas production from hydrate-bearing sediments |
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Authors: | JianMing Gong ZhiMin Cao JianWen Chen Min Zhang Jin Li GuiFang Yang |
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Institution: | (1) College of Marine Geosciences, Ocean University of China, Qingdao, 266003, China;(2) Qingdao Institute of Marine Geology, Qingdao, 266071, China;(3) Geochemical Department, Yangtze University, Jingzhou, 434023, China;(4) Langfang Branch, Research Institute of Petroleum Exploration & Development, PetroChina, Langfang, 065007, China |
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Abstract: | Experiments were made on 58 sediment samples from four sites (1244, 1245, 1250 and 1251) of ODP204 at five temperature points
(25, 35, 45, 55 and 65°C) to simulate methane production from hydrate-bearing sediments. Simulation results from site 1244
show that the gas components consist mainly of methane and carbon dioxide, and heavy hydrocarbons more than C2
+ cannot be detected. This site also gives results, similar to those from the other three, that the methane production is controlled
by experimental temperatures, generally reaching the maximum gas yields per gram sediment or TOC under lower temperatures
(25 and 35°C). In other words, the methane amount could be related to the buried depth of sediments, given the close relation
between the depth and temperature. Sediments less than 1200 m below seafloor are inferred to still act as a biogenic gas producer
to pour methane into the present hydrate zone, while sedimentary layers more than 1200 m below seafloor have become too biogenically
exhausted to offer any biogas, but instead they produce thermogenic gas to give additional supply to the hydrate formation
in the study area.
Supported by the National Natural Science Foundation of China (Grant No. 40576059) |
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Keywords: | gas production simulation experiment hydrate-bearing sediments ODP204 |
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