Well log evaluation of natural gas hydrates
Gas hydrates are crystalline substances composed of water and gas, in which a solid-water-lattice accommodates gas molecules in a cage-like structure. Gas hydrates are globally widespread in permafrost regions and beneath the sea in sediment of outer continental margins. While methane, propane, and...
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Geological Survey, Denver, CO (United States)
1992
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ftunivnotexas:info:ark/67531/metadc1189978 2023-05-15T17:58:16+02:00 Well log evaluation of natural gas hydrates Collett, T.S. United States. Department of Energy. 1992-10-01 52 p. Text https://doi.org/10.2172/6824342 https://digital.library.unt.edu/ark:/67531/metadc1189978/ English eng Geological Survey, Denver, CO (United States) other: DE93000255 rep-no: DOE/MC/20422-3319 grantno: AI21-83MC20422 doi:10.2172/6824342 osti: 6824342 https://digital.library.unt.edu/ark:/67531/metadc1189978/ ark: ark:/67531/metadc1189978 Data Hydrocarbons Saturation 030200* -- Natural Gas-- Reserves Geology & Exploration Information Well Logging 440400 -- Well Logging Instrumentation Water Saturation Organic Compounds Hydrates Natural Gas Hydrate Deposits Methane Porosity Gas Hydrates Geologic Deposits Resource Assessment Numerical Data 03 Natural Gas Alkanes Evaluation 47 Other Instrumentation Report 1992 ftunivnotexas https://doi.org/10.2172/6824342 2020-12-19T23:08:10Z Gas hydrates are crystalline substances composed of water and gas, in which a solid-water-lattice accommodates gas molecules in a cage-like structure. Gas hydrates are globally widespread in permafrost regions and beneath the sea in sediment of outer continental margins. While methane, propane, and other gases can be included in the clathrate structure, methane hydrates appear to be the most common in nature. The amount of methane sequestered in gas hydrates is probably enormous, but estimates are speculative and range over three orders of magnitude from about 100,000 to 270,000,000 trillion cubic feet. The amount of gas in the hydrate reservoirs of the world greedy exceeds the volume of known conventional gas reserves. Gas hydrates also represent a significant drilling and production hazard. A fundamental question linking gas hydrate resource and hazard issues is: What is the volume of gas hydrates and included gas within a given gas hydrate occurrence Most published gas hydrate resource estimates have, of necessity, been made by broad extrapolation of only general knowledge of local geologic conditions. Gas volumes that may be attributed to gas hydrates are dependent on a number of reservoir parameters, including the areal extent ofthe gas-hydrate occurrence, reservoir thickness, hydrate number, reservoir porosity, and the degree of gas-hydrate saturation. Two of the most difficult reservoir parameters to determine are porosity and degreeof gas hydrate saturation. Well logs often serve as a source of porosity and hydrocarbon saturation data; however, well-log calculations within gas-hydrate-bearing intervals are subject to error. The primary reason for this difficulty is the lack of quantitative laboratory and field studies. The primary purpose of this paper is to review the response of well logs to the presence of gas hydrates. Report permafrost University of North Texas: UNT Digital Library |
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Open Polar |
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University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Data Hydrocarbons Saturation 030200* -- Natural Gas-- Reserves Geology & Exploration Information Well Logging 440400 -- Well Logging Instrumentation Water Saturation Organic Compounds Hydrates Natural Gas Hydrate Deposits Methane Porosity Gas Hydrates Geologic Deposits Resource Assessment Numerical Data 03 Natural Gas Alkanes Evaluation 47 Other Instrumentation |
spellingShingle |
Data Hydrocarbons Saturation 030200* -- Natural Gas-- Reserves Geology & Exploration Information Well Logging 440400 -- Well Logging Instrumentation Water Saturation Organic Compounds Hydrates Natural Gas Hydrate Deposits Methane Porosity Gas Hydrates Geologic Deposits Resource Assessment Numerical Data 03 Natural Gas Alkanes Evaluation 47 Other Instrumentation Collett, T.S. Well log evaluation of natural gas hydrates |
topic_facet |
Data Hydrocarbons Saturation 030200* -- Natural Gas-- Reserves Geology & Exploration Information Well Logging 440400 -- Well Logging Instrumentation Water Saturation Organic Compounds Hydrates Natural Gas Hydrate Deposits Methane Porosity Gas Hydrates Geologic Deposits Resource Assessment Numerical Data 03 Natural Gas Alkanes Evaluation 47 Other Instrumentation |
description |
Gas hydrates are crystalline substances composed of water and gas, in which a solid-water-lattice accommodates gas molecules in a cage-like structure. Gas hydrates are globally widespread in permafrost regions and beneath the sea in sediment of outer continental margins. While methane, propane, and other gases can be included in the clathrate structure, methane hydrates appear to be the most common in nature. The amount of methane sequestered in gas hydrates is probably enormous, but estimates are speculative and range over three orders of magnitude from about 100,000 to 270,000,000 trillion cubic feet. The amount of gas in the hydrate reservoirs of the world greedy exceeds the volume of known conventional gas reserves. Gas hydrates also represent a significant drilling and production hazard. A fundamental question linking gas hydrate resource and hazard issues is: What is the volume of gas hydrates and included gas within a given gas hydrate occurrence Most published gas hydrate resource estimates have, of necessity, been made by broad extrapolation of only general knowledge of local geologic conditions. Gas volumes that may be attributed to gas hydrates are dependent on a number of reservoir parameters, including the areal extent ofthe gas-hydrate occurrence, reservoir thickness, hydrate number, reservoir porosity, and the degree of gas-hydrate saturation. Two of the most difficult reservoir parameters to determine are porosity and degreeof gas hydrate saturation. Well logs often serve as a source of porosity and hydrocarbon saturation data; however, well-log calculations within gas-hydrate-bearing intervals are subject to error. The primary reason for this difficulty is the lack of quantitative laboratory and field studies. The primary purpose of this paper is to review the response of well logs to the presence of gas hydrates. |
author2 |
United States. Department of Energy. |
format |
Report |
author |
Collett, T.S. |
author_facet |
Collett, T.S. |
author_sort |
Collett, T.S. |
title |
Well log evaluation of natural gas hydrates |
title_short |
Well log evaluation of natural gas hydrates |
title_full |
Well log evaluation of natural gas hydrates |
title_fullStr |
Well log evaluation of natural gas hydrates |
title_full_unstemmed |
Well log evaluation of natural gas hydrates |
title_sort |
well log evaluation of natural gas hydrates |
publisher |
Geological Survey, Denver, CO (United States) |
publishDate |
1992 |
url |
https://doi.org/10.2172/6824342 https://digital.library.unt.edu/ark:/67531/metadc1189978/ |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
other: DE93000255 rep-no: DOE/MC/20422-3319 grantno: AI21-83MC20422 doi:10.2172/6824342 osti: 6824342 https://digital.library.unt.edu/ark:/67531/metadc1189978/ ark: ark:/67531/metadc1189978 |
op_doi |
https://doi.org/10.2172/6824342 |
_version_ |
1766166842044317696 |