A novel evaluation method of natural gas hydrate saturation in reservoirs based on the equivalent medium theory
Abstract Natural gas hydrate saturation (NGHS) in reservoirs is one of the critical parameters for evaluating natural gas hydrate resource reserves. Current widely-accepted evaluation methods developed for evaluating conventional natural gas saturation in reservoirs, to some extents, are not suffici...
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ftdoajarticles:oai:doaj.org/article:b9af34150c944561ab384e2cd09c53d3 2024-02-11T10:07:54+01:00 A novel evaluation method of natural gas hydrate saturation in reservoirs based on the equivalent medium theory Qiangui Zhang Quanshan Li Xiangyu Fan Yufei Chen Zhaoxiang Wang Bowei Yao Na Wei Jun Zhao 2024-01-01T00:00:00Z https://doi.org/10.1007/s40948-023-00700-6 https://doaj.org/article/b9af34150c944561ab384e2cd09c53d3 EN eng Springer https://doi.org/10.1007/s40948-023-00700-6 https://doaj.org/toc/2363-8419 https://doaj.org/toc/2363-8427 doi:10.1007/s40948-023-00700-6 2363-8419 2363-8427 https://doaj.org/article/b9af34150c944561ab384e2cd09c53d3 Geomechanics and Geophysics for Geo-Energy and Geo-Resources, Vol 10, Iss 1, Pp 1-19 (2024) Natural gas hydrate Reservoir saturation Equivalent medium theory Evaluation method Logging data Geophysics. Cosmic physics QC801-809 article 2024 ftdoajarticles https://doi.org/10.1007/s40948-023-00700-6 2024-01-14T01:51:44Z Abstract Natural gas hydrate saturation (NGHS) in reservoirs is one of the critical parameters for evaluating natural gas hydrate resource reserves. Current widely-accepted evaluation methods developed for evaluating conventional natural gas saturation in reservoirs, to some extents, are not sufficient enough to obtain accurate predicted results. In light of the equivalent medium theory, the natural gas hydrate is regarded as the fluid (Mode A) when NGHS is relatively low, while it is regarded as the rock matrix (Mode B) when NGHS is high. Two mathematical model are then developed for evaluating NGHS at Mode A and B. Experimental verification shows that R 2 of the predicted results based upon the proposed model is 0.968, and the average absolute relative error percentage is 8.90%. The error of the predicted results gradually decreases with increasing NGHS, whereas increases with increasing confining pressure. In addition, the proposed model has been applied to the 142.9–147.7 m well section of Well DK-1 in the permafrost region, Qilian Mountains. The results show that the error of the predicted results is less than 13.92%, with its average error being 10.51%. The predicted value gradually increases with its error decreasing as the depth continues to increase, which is consistent with the change behavior of measured data. NGHS evaluation method proposed in this paper fully considers the occurrence form of natural gas hydrate in reservoirs. The model parameters are easy to determine and the predicted results are reliable. Article in Journal/Newspaper permafrost Directory of Open Access Journals: DOAJ Articles Geomechanics and Geophysics for Geo-Energy and Geo-Resources 10 1 |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Natural gas hydrate Reservoir saturation Equivalent medium theory Evaluation method Logging data Geophysics. Cosmic physics QC801-809 |
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Natural gas hydrate Reservoir saturation Equivalent medium theory Evaluation method Logging data Geophysics. Cosmic physics QC801-809 Qiangui Zhang Quanshan Li Xiangyu Fan Yufei Chen Zhaoxiang Wang Bowei Yao Na Wei Jun Zhao A novel evaluation method of natural gas hydrate saturation in reservoirs based on the equivalent medium theory |
topic_facet |
Natural gas hydrate Reservoir saturation Equivalent medium theory Evaluation method Logging data Geophysics. Cosmic physics QC801-809 |
description |
Abstract Natural gas hydrate saturation (NGHS) in reservoirs is one of the critical parameters for evaluating natural gas hydrate resource reserves. Current widely-accepted evaluation methods developed for evaluating conventional natural gas saturation in reservoirs, to some extents, are not sufficient enough to obtain accurate predicted results. In light of the equivalent medium theory, the natural gas hydrate is regarded as the fluid (Mode A) when NGHS is relatively low, while it is regarded as the rock matrix (Mode B) when NGHS is high. Two mathematical model are then developed for evaluating NGHS at Mode A and B. Experimental verification shows that R 2 of the predicted results based upon the proposed model is 0.968, and the average absolute relative error percentage is 8.90%. The error of the predicted results gradually decreases with increasing NGHS, whereas increases with increasing confining pressure. In addition, the proposed model has been applied to the 142.9–147.7 m well section of Well DK-1 in the permafrost region, Qilian Mountains. The results show that the error of the predicted results is less than 13.92%, with its average error being 10.51%. The predicted value gradually increases with its error decreasing as the depth continues to increase, which is consistent with the change behavior of measured data. NGHS evaluation method proposed in this paper fully considers the occurrence form of natural gas hydrate in reservoirs. The model parameters are easy to determine and the predicted results are reliable. |
format |
Article in Journal/Newspaper |
author |
Qiangui Zhang Quanshan Li Xiangyu Fan Yufei Chen Zhaoxiang Wang Bowei Yao Na Wei Jun Zhao |
author_facet |
Qiangui Zhang Quanshan Li Xiangyu Fan Yufei Chen Zhaoxiang Wang Bowei Yao Na Wei Jun Zhao |
author_sort |
Qiangui Zhang |
title |
A novel evaluation method of natural gas hydrate saturation in reservoirs based on the equivalent medium theory |
title_short |
A novel evaluation method of natural gas hydrate saturation in reservoirs based on the equivalent medium theory |
title_full |
A novel evaluation method of natural gas hydrate saturation in reservoirs based on the equivalent medium theory |
title_fullStr |
A novel evaluation method of natural gas hydrate saturation in reservoirs based on the equivalent medium theory |
title_full_unstemmed |
A novel evaluation method of natural gas hydrate saturation in reservoirs based on the equivalent medium theory |
title_sort |
novel evaluation method of natural gas hydrate saturation in reservoirs based on the equivalent medium theory |
publisher |
Springer |
publishDate |
2024 |
url |
https://doi.org/10.1007/s40948-023-00700-6 https://doaj.org/article/b9af34150c944561ab384e2cd09c53d3 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Geomechanics and Geophysics for Geo-Energy and Geo-Resources, Vol 10, Iss 1, Pp 1-19 (2024) |
op_relation |
https://doi.org/10.1007/s40948-023-00700-6 https://doaj.org/toc/2363-8419 https://doaj.org/toc/2363-8427 doi:10.1007/s40948-023-00700-6 2363-8419 2363-8427 https://doaj.org/article/b9af34150c944561ab384e2cd09c53d3 |
op_doi |
https://doi.org/10.1007/s40948-023-00700-6 |
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Geomechanics and Geophysics for Geo-Energy and Geo-Resources |
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10 |
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