DOI: 10.1016/j.epsl.2018.08.051
Scopus记录号: 2-s2.0-85053001707
论文题名: Investigating a gas hydrate system in apparent disequilibrium in the Danube Fan, Black Sea
作者: Hillman J.I.T. ; Burwicz E. ; Zander T. ; Bialas J. ; Klaucke I. ; Feldman H. ; Drexler T. ; Awwiller D.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 502 起始页码: 1
结束页码: 11
语种: 英语
英文关键词: BSR
; Danube Fan
; gas hydrate
; modelling
Scopus关键词: Analytical geochemistry
; Cables
; Gases
; Geophysical prospecting
; Hydration
; Models
; Seismic response
; Seismic waves
; Bottom simulating reflection
; Geochemical analysis
; Geothermal gradients
; Heterogeneous sediments
; High amplitudes
; Hydrate stabilities
; Steady and transient state
; Variable thermal properties
; Gas hydrates
; disequilibrium
; gas hydrate
; geochemistry
; geological mapping
; P-wave
; seismic data
; seismic reflection
; stability analysis
; two-dimensional modeling
; Black Sea
; Danube Fan
英文摘要: The Danube Fan in the western Black Sea shows many features indicating the presence of gas and gas hydrates, including a bottom simulating reflection (BSR), high-amplitude anomalies beneath the BSR and the presence of gas flares at the seafloor. The BSR depth derived from 3D P-cable seismic data of an older slope canyon of the fan (the S2 canyon) suggests that the BSR is not in equilibrium with the present-day topography. The Danube Fan was abandoned ∼7.5 ka, and the S2 canyon was likely incised ∼20 ka, suggesting that the gas hydrate system has had at least 7.5 ka years to equilibrate to the present-day conditions. Here we examine the extent and position of the hydrate stability zone through constructing both steady and transient state models of a 2D profile across the S2 canyon. This was done using inputs from mapping of the 3D P-cable seismic data and geochemical analysis of core samples. Using these models, we investigate the effects of different factors including variable thermal properties of heterogeneous sediments in the vicinity of the canyon and, topographic focusing on the geothermal gradient on the extent of the hydrate stability zone. Our results indicate that both factors have a significant effect and that the hydrate system may actually be in, or approaching equilibrium. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109640
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: GEOMAR Helmholtz Centre for Ocean Research, Kiel, Germany; ExxonMobil Upstream Research Company, Houston, TX, United States
Recommended Citation:
Hillman J.I.T.,Burwicz E.,Zander T.,et al. Investigating a gas hydrate system in apparent disequilibrium in the Danube Fan, Black Sea[J]. Earth and Planetary Science Letters,2018-01-01,502