Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors
As massive methane hydrate reservoirs in Shenhu slope area of northern South China, the structural-seepage hydrate-bearing sediments, which mainly include thick-bedded and disseminated types of hydrates, show favorable advantages of high content, great thickness, and excellent exploitation value. Th...
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ftchacadsciegiec:oai:ir.giec.ac.cn:344007/25690 2023-05-15T17:11:18+02:00 Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors Guan, Jinan Wan, Lihua Liang, Deqing 2019-09-01 http://ir.giec.ac.cn/handle/344007/25690 https://doi.org/10.1016/j.marpetgeo.2019.05.024 英语 eng ELSEVIER SCI LTD MARINE AND PETROLEUM GEOLOGY http://ir.giec.ac.cn/handle/344007/25690 doi:10.1016/j.marpetgeo.2019.05.024 Shenhu area Methane hydrate Structural-seepage type Formation dynamics Seafloor sedimentation RIVER MOUTH BASIN GAS HYDRATE CONTINENTAL-SLOPE BEARING SEDIMENTS MARINE-SEDIMENTS ACCUMULATION SATURATION SIMULATION EVOLUTION MIGRATION Geology Geosciences Multidisciplinary 期刊论文 2019 ftchacadsciegiec https://doi.org/10.1016/j.marpetgeo.2019.05.024 2022-09-23T14:15:26Z As massive methane hydrate reservoirs in Shenhu slope area of northern South China, the structural-seepage hydrate-bearing sediments, which mainly include thick-bedded and disseminated types of hydrates, show favorable advantages of high content, great thickness, and excellent exploitation value. They are generated by thermogenic methane vertically migrated from deep strata through faults, and finally accumulate in shallow sand layers. In order to investigate the formation dynamics of massive methane hydrate reservoirs in Shenhu area, a vertical fluid flow-methane hydrate formation reaction-seafloor sedimentation model is designed to gauge the accumulation mechanism. From the analysis of Peclet number which weighs the relative importance between deposition and formation reaction, local methane hydrate looks more likely to actively gather together in the sediments primarily, then gradually evolve into massive reservoirs accompanying passive seafloor sedimentation. Through choosing three typical formation stages (50 ka, 3 Ma, and 5 Ma) to exhibit the evolution process of these hydrate reservoirs, the change of local pressures, temperatures, dissolved methane and salt, phase saturations, stratum permeability, and pore capillary pressure deduces how the structural-seepage hydrate reservoir operates. The investigation also shows that after 5 Ma theses hydrate-bearing layers can proceed to take on similar appearance with current occurrence when average seafloor sedimentation rate and the initial seafloor are 5 cm/ka and 988 m, respectively. Finally, the performance of five controlling factors, including methane flux, kinetic coefficient, initial fluid position, permeability and seafloor sedimentation rate, has been quantitatively assessed in this formation model. Our work verifies this methane hydrate formation reaction-seafloor sedimentation mechanism is adequate for studying Shenhu structural-seepage hydrate reservoirs. The findings further suggest the combination of small methane flux and small reaction coefficient ... Report Methane hydrate Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR Marine and Petroleum Geology 107 185 197 |
institution |
Open Polar |
collection |
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences: GIEC OpenIR |
op_collection_id |
ftchacadsciegiec |
language |
English |
topic |
Shenhu area Methane hydrate Structural-seepage type Formation dynamics Seafloor sedimentation RIVER MOUTH BASIN GAS HYDRATE CONTINENTAL-SLOPE BEARING SEDIMENTS MARINE-SEDIMENTS ACCUMULATION SATURATION SIMULATION EVOLUTION MIGRATION Geology Geosciences Multidisciplinary |
spellingShingle |
Shenhu area Methane hydrate Structural-seepage type Formation dynamics Seafloor sedimentation RIVER MOUTH BASIN GAS HYDRATE CONTINENTAL-SLOPE BEARING SEDIMENTS MARINE-SEDIMENTS ACCUMULATION SATURATION SIMULATION EVOLUTION MIGRATION Geology Geosciences Multidisciplinary Guan, Jinan Wan, Lihua Liang, Deqing Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors |
topic_facet |
Shenhu area Methane hydrate Structural-seepage type Formation dynamics Seafloor sedimentation RIVER MOUTH BASIN GAS HYDRATE CONTINENTAL-SLOPE BEARING SEDIMENTS MARINE-SEDIMENTS ACCUMULATION SATURATION SIMULATION EVOLUTION MIGRATION Geology Geosciences Multidisciplinary |
description |
As massive methane hydrate reservoirs in Shenhu slope area of northern South China, the structural-seepage hydrate-bearing sediments, which mainly include thick-bedded and disseminated types of hydrates, show favorable advantages of high content, great thickness, and excellent exploitation value. They are generated by thermogenic methane vertically migrated from deep strata through faults, and finally accumulate in shallow sand layers. In order to investigate the formation dynamics of massive methane hydrate reservoirs in Shenhu area, a vertical fluid flow-methane hydrate formation reaction-seafloor sedimentation model is designed to gauge the accumulation mechanism. From the analysis of Peclet number which weighs the relative importance between deposition and formation reaction, local methane hydrate looks more likely to actively gather together in the sediments primarily, then gradually evolve into massive reservoirs accompanying passive seafloor sedimentation. Through choosing three typical formation stages (50 ka, 3 Ma, and 5 Ma) to exhibit the evolution process of these hydrate reservoirs, the change of local pressures, temperatures, dissolved methane and salt, phase saturations, stratum permeability, and pore capillary pressure deduces how the structural-seepage hydrate reservoir operates. The investigation also shows that after 5 Ma theses hydrate-bearing layers can proceed to take on similar appearance with current occurrence when average seafloor sedimentation rate and the initial seafloor are 5 cm/ka and 988 m, respectively. Finally, the performance of five controlling factors, including methane flux, kinetic coefficient, initial fluid position, permeability and seafloor sedimentation rate, has been quantitatively assessed in this formation model. Our work verifies this methane hydrate formation reaction-seafloor sedimentation mechanism is adequate for studying Shenhu structural-seepage hydrate reservoirs. The findings further suggest the combination of small methane flux and small reaction coefficient ... |
format |
Report |
author |
Guan, Jinan Wan, Lihua Liang, Deqing |
author_facet |
Guan, Jinan Wan, Lihua Liang, Deqing |
author_sort |
Guan, Jinan |
title |
Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors |
title_short |
Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors |
title_full |
Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors |
title_fullStr |
Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors |
title_full_unstemmed |
Gauging formation dynamics of structural-seepage methane hydrate reservoirs in Shenhu area of northern South China Sea: Impact of seafloor sedimentation and assessment of controlling factors |
title_sort |
gauging formation dynamics of structural-seepage methane hydrate reservoirs in shenhu area of northern south china sea: impact of seafloor sedimentation and assessment of controlling factors |
publisher |
ELSEVIER SCI LTD |
publishDate |
2019 |
url |
http://ir.giec.ac.cn/handle/344007/25690 https://doi.org/10.1016/j.marpetgeo.2019.05.024 |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_relation |
MARINE AND PETROLEUM GEOLOGY http://ir.giec.ac.cn/handle/344007/25690 doi:10.1016/j.marpetgeo.2019.05.024 |
op_doi |
https://doi.org/10.1016/j.marpetgeo.2019.05.024 |
container_title |
Marine and Petroleum Geology |
container_volume |
107 |
container_start_page |
185 |
op_container_end_page |
197 |
_version_ |
1766068112878206976 |