Morphology identification of gas hydrate from pointwise Lipschitz regularity for P- and S-wave velocity

The accurate morphology identification of gas hydrate-bearing sediments (GHBS) has great significance in practical exploitation and subsequent resource evaluation. Previous studies have disclosed two main morphologies for gas hydrate in sediments: pore- and fracture-filling. However, the existing id...

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Autores principales:	Xiangyu Zhu, Xuewei Liu
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Gas hydrate Morphology P-wave velocity S-wave velocity Lipschitz exponent Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/2d8c4106dd76459397416a40bc008179
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spelling	oai:doaj.org-article:2d8c4106dd76459397416a40bc0081792021-11-28T04:33:50ZMorphology identification of gas hydrate from pointwise Lipschitz regularity for P- and S-wave velocity2352-484710.1016/j.egyr.2021.06.091https://doaj.org/article/2d8c4106dd76459397416a40bc0081792021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S235248472100456Xhttps://doaj.org/toc/2352-4847The accurate morphology identification of gas hydrate-bearing sediments (GHBS) has great significance in practical exploitation and subsequent resource evaluation. Previous studies have disclosed two main morphologies for gas hydrate in sediments: pore- and fracture-filling. However, the existing identification methods of gas hydrate’s morphology rarely consider their intrinsic differences in distribution characteristics. In this paper, a new method is proposed to identify the morphology of hydrate according to the scattered distribution of fracture dips for fracture-filling GHBS. Firstly, numerical simulations are performed to study the relationships between the morphology of hydrate and the sonic velocities. Considering the dip variation is within a certain range for fracture-filling hydrate, the theoretical curves show that the resulting mutation degrees between P- and S-wave velocities are inconsistent in fracture-filling GHBS, which is different from pore-filling GHBS. Then the modified estimation method for pointwise Lipschitz exponent α is introduced to capture their differences. The cross plots of Lipschitz exponent for P-wave velocity, α(Vp), and Lipschitz exponent for S-wave velocity, α(Vs), indicate that most of the dots representing pore-filling GHBS are evenly distributed near the line α(Vp)=α(Vs), while the dots representing fracture-filling GHBS are scattered outside the line α(Vp)=α(Vs). Based on these characteristics, a ratio method is put forward to differentiate the two types of hydrate. These hypotheses and methods are verified using the measured P- and S-wave velocities log data at different sites in Leg 204, Ocean Drilling Program (ODP), in the United States. Finally, the results of this new method agree closely with core data.Xiangyu ZhuXuewei LiuElsevierarticleGas hydrateMorphologyP-wave velocityS-wave velocityLipschitz exponentElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 7, Iss , Pp 8062-8074 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Gas hydrate Morphology P-wave velocity S-wave velocity Lipschitz exponent Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Gas hydrate Morphology P-wave velocity S-wave velocity Lipschitz exponent Electrical engineering. Electronics. Nuclear engineering TK1-9971 Xiangyu Zhu Xuewei Liu Morphology identification of gas hydrate from pointwise Lipschitz regularity for P- and S-wave velocity
description	The accurate morphology identification of gas hydrate-bearing sediments (GHBS) has great significance in practical exploitation and subsequent resource evaluation. Previous studies have disclosed two main morphologies for gas hydrate in sediments: pore- and fracture-filling. However, the existing identification methods of gas hydrate’s morphology rarely consider their intrinsic differences in distribution characteristics. In this paper, a new method is proposed to identify the morphology of hydrate according to the scattered distribution of fracture dips for fracture-filling GHBS. Firstly, numerical simulations are performed to study the relationships between the morphology of hydrate and the sonic velocities. Considering the dip variation is within a certain range for fracture-filling hydrate, the theoretical curves show that the resulting mutation degrees between P- and S-wave velocities are inconsistent in fracture-filling GHBS, which is different from pore-filling GHBS. Then the modified estimation method for pointwise Lipschitz exponent α is introduced to capture their differences. The cross plots of Lipschitz exponent for P-wave velocity, α(Vp), and Lipschitz exponent for S-wave velocity, α(Vs), indicate that most of the dots representing pore-filling GHBS are evenly distributed near the line α(Vp)=α(Vs), while the dots representing fracture-filling GHBS are scattered outside the line α(Vp)=α(Vs). Based on these characteristics, a ratio method is put forward to differentiate the two types of hydrate. These hypotheses and methods are verified using the measured P- and S-wave velocities log data at different sites in Leg 204, Ocean Drilling Program (ODP), in the United States. Finally, the results of this new method agree closely with core data.
format	article
author	Xiangyu Zhu Xuewei Liu
author_facet	Xiangyu Zhu Xuewei Liu
author_sort	Xiangyu Zhu
title	Morphology identification of gas hydrate from pointwise Lipschitz regularity for P- and S-wave velocity
title_short	Morphology identification of gas hydrate from pointwise Lipschitz regularity for P- and S-wave velocity
title_full	Morphology identification of gas hydrate from pointwise Lipschitz regularity for P- and S-wave velocity
title_fullStr	Morphology identification of gas hydrate from pointwise Lipschitz regularity for P- and S-wave velocity
title_full_unstemmed	Morphology identification of gas hydrate from pointwise Lipschitz regularity for P- and S-wave velocity
title_sort	morphology identification of gas hydrate from pointwise lipschitz regularity for p- and s-wave velocity
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/2d8c4106dd76459397416a40bc008179
work_keys_str_mv	AT xiangyuzhu morphologyidentificationofgashydratefrompointwiselipschitzregularityforpandswavevelocity AT xueweiliu morphologyidentificationofgashydratefrompointwiselipschitzregularityforpandswavevelocity
_version_	1718408308236222464

Morphology identification of gas hydrate from pointwise Lipschitz regularity for P- and S-wave velocity

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