Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea

ABSTRACT: Evaluating velocity-porosity relationships of hydrate-bearing marine sediments is essential for characterizing natural gas hydrates below seafloor as either a potential energy resource or geohazards risks. Four sites had cored using pressure and non-pressure methods during the gas hydrates...
Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Lin Lin [verfasserIn] Jun Cao [verfasserIn] Jin Qian [verfasserIn] Jiu-jing Shang [verfasserIn] Wei Zhang [verfasserIn] Jin-gan Lu [verfasserIn] Jin-qiang Liang [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2022

Schlagwörter:	Natural gas hydrates (NGHs) Methane hydrate P-wave velocity Porosity Saturation Pressure-core

Übergeordnetes Werk:	In: China Geology - KeAi Communications Co., Ltd., 2020, 5(2022), 2, Seite 267-275
Übergeordnetes Werk:	volume:5 ; year:2022 ; number:2 ; pages:267-275

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc

DOI / URN:	10.31035/cg2022006

Katalog-ID:	DOAJ080903509

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callnumber-first	T - Technology
author	Lin Lin
spellingShingle	Lin Lin misc TA1-2040 misc QE1-996.5 misc Natural gas hydrates (NGHs) misc Methane hydrate misc P-wave velocity misc Porosity misc Saturation misc Pressure-core misc Engineering (General). Civil engineering (General) misc Geology Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea
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topic_title	TA1-2040 QE1-996.5 Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea Natural gas hydrates (NGHs) Methane hydrate P-wave velocity Porosity Saturation Pressure-core
topic	misc TA1-2040 misc QE1-996.5 misc Natural gas hydrates (NGHs) misc Methane hydrate misc P-wave velocity misc Porosity misc Saturation misc Pressure-core misc Engineering (General). Civil engineering (General) misc Geology
topic_unstemmed	misc TA1-2040 misc QE1-996.5 misc Natural gas hydrates (NGHs) misc Methane hydrate misc P-wave velocity misc Porosity misc Saturation misc Pressure-core misc Engineering (General). Civil engineering (General) misc Geology
topic_browse	misc TA1-2040 misc QE1-996.5 misc Natural gas hydrates (NGHs) misc Methane hydrate misc P-wave velocity misc Porosity misc Saturation misc Pressure-core misc Engineering (General). Civil engineering (General) misc Geology
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title	Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea
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title_full	Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea
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title_sort	velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, shenhu area, south china sea
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title_auth	Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea
abstract	ABSTRACT: Evaluating velocity-porosity relationships of hydrate-bearing marine sediments is essential for characterizing natural gas hydrates below seafloor as either a potential energy resource or geohazards risks. Four sites had cored using pressure and non-pressure methods during the gas hydrates drilling project (GMGS4) expedition at Shenhu Area, north slope of the South China Sea. Sediments were cored above, below, and through the gas-hydrate-bearing zone guided with logging-while-drilling analysis results. Gamma density and P-wave velocity were measured in each pressure core before subsampling. Methane hydrates volumes in total 62 samples were calculated from the moles of excess methane collected during depressurization experiments. The concentration of methane hydrates ranged from 0.3% to 32.3%. The concentrations of pore fluid (25.44% to 68.82%) and sediments (23.63% to 54.28%) were calculated from the gamma density. The regression models of P-wave velocity were derived and compared with a global empirical equation derived from shallow, unconsolidated sediments data. The results were close to the global trend when the fluid concentration is larger than the critical porosity. It is concluded that the dominant factor of P-wave velocity in hydrate-bearing marine sediments is the presence of the hydrate. Methane hydrates can reduce the fluid concentration by discharging the pore fluid and occupying the original pore space of sediments after its formation.©2022 China Geology Editorial Office.
abstractGer	ABSTRACT: Evaluating velocity-porosity relationships of hydrate-bearing marine sediments is essential for characterizing natural gas hydrates below seafloor as either a potential energy resource or geohazards risks. Four sites had cored using pressure and non-pressure methods during the gas hydrates drilling project (GMGS4) expedition at Shenhu Area, north slope of the South China Sea. Sediments were cored above, below, and through the gas-hydrate-bearing zone guided with logging-while-drilling analysis results. Gamma density and P-wave velocity were measured in each pressure core before subsampling. Methane hydrates volumes in total 62 samples were calculated from the moles of excess methane collected during depressurization experiments. The concentration of methane hydrates ranged from 0.3% to 32.3%. The concentrations of pore fluid (25.44% to 68.82%) and sediments (23.63% to 54.28%) were calculated from the gamma density. The regression models of P-wave velocity were derived and compared with a global empirical equation derived from shallow, unconsolidated sediments data. The results were close to the global trend when the fluid concentration is larger than the critical porosity. It is concluded that the dominant factor of P-wave velocity in hydrate-bearing marine sediments is the presence of the hydrate. Methane hydrates can reduce the fluid concentration by discharging the pore fluid and occupying the original pore space of sediments after its formation.©2022 China Geology Editorial Office.
abstract_unstemmed	ABSTRACT: Evaluating velocity-porosity relationships of hydrate-bearing marine sediments is essential for characterizing natural gas hydrates below seafloor as either a potential energy resource or geohazards risks. Four sites had cored using pressure and non-pressure methods during the gas hydrates drilling project (GMGS4) expedition at Shenhu Area, north slope of the South China Sea. Sediments were cored above, below, and through the gas-hydrate-bearing zone guided with logging-while-drilling analysis results. Gamma density and P-wave velocity were measured in each pressure core before subsampling. Methane hydrates volumes in total 62 samples were calculated from the moles of excess methane collected during depressurization experiments. The concentration of methane hydrates ranged from 0.3% to 32.3%. The concentrations of pore fluid (25.44% to 68.82%) and sediments (23.63% to 54.28%) were calculated from the gamma density. The regression models of P-wave velocity were derived and compared with a global empirical equation derived from shallow, unconsolidated sediments data. The results were close to the global trend when the fluid concentration is larger than the critical porosity. It is concluded that the dominant factor of P-wave velocity in hydrate-bearing marine sediments is the presence of the hydrate. Methane hydrates can reduce the fluid concentration by discharging the pore fluid and occupying the original pore space of sediments after its formation.©2022 China Geology Editorial Office.
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title_short	Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea
url	https://doi.org/10.31035/cg2022006 https://doaj.org/article/34b04f751c944463a2b39877027bed53 http://www.sciencedirect.com/science/article/pii/S2096519222001161 https://doaj.org/toc/2096-5192
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Four sites had cored using pressure and non-pressure methods during the gas hydrates drilling project (GMGS4) expedition at Shenhu Area, north slope of the South China Sea. Sediments were cored above, below, and through the gas-hydrate-bearing zone guided with logging-while-drilling analysis results. Gamma density and P-wave velocity were measured in each pressure core before subsampling. Methane hydrates volumes in total 62 samples were calculated from the moles of excess methane collected during depressurization experiments. The concentration of methane hydrates ranged from 0.3% to 32.3%. The concentrations of pore fluid (25.44% to 68.82%) and sediments (23.63% to 54.28%) were calculated from the gamma density. The regression models of P-wave velocity were derived and compared with a global empirical equation derived from shallow, unconsolidated sediments data. The results were close to the global trend when the fluid concentration is larger than the critical porosity. It is concluded that the dominant factor of P-wave velocity in hydrate-bearing marine sediments is the presence of the hydrate. Methane hydrates can reduce the fluid concentration by discharging the pore fluid and occupying the original pore space of sediments after its formation.©2022 China Geology Editorial Office.</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Natural gas hydrates (NGHs)</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Methane hydrate</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">P-wave velocity</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Porosity</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Saturation</subfield></datafield><datafield tag="650" ind1=" " ind2="4"><subfield code="a">Pressure-core</subfield></datafield><datafield tag="653" ind1=" " ind2="0"><subfield code="a">Engineering (General). 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Velocity-porosity relationships in hydrate-bearing sediments measured from pressure cores, Shenhu Area, South China Sea

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