scholarly journals Gas Hydrate System Offshore Chile

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 709
Author(s):  
Ivan Vargas-Cordero ◽  
Michela Giustiniani ◽  
Umberta Tinivella ◽  
Lucia Villar-Muñoz ◽  
Giulia Alessandrini
Keyword(s):  
Gas Hydrate ◽  
Slope Failure ◽  
Natural Phenomena ◽  
Hydrate Dissociation ◽  
Free Gas ◽  
Hydrate Reservoir ◽  
Porosity Reduction ◽  
Gas Hydrate Reservoir ◽  
High Concentrations ◽  
Seismic Lines

In recent decades, the Chilean margin has been extensively investigated to better characterize the complex geological setting through the geophysical data. The analysis of seismic lines allowed us to identify the occurrence of gas hydrates and free gas in many places along the margin and the change of the pore fluid due to the potential hydrate dissociation. The porosity reduction due to the hydrate presence is linked to the slope to identify the area more sensitive in case of natural phenomena or induced by human activities that could determine gas hydrate dissociations and/or leakage of the free gas trapped below the gas-hydrate stability zone. Clearly, the gas hydrate reservoir could be a strategic energy reserve for Chile. The steady-state modelling pointed out that the climate change could determine gas hydrate dissociation, triggering slope failure. This hypothesis is supported by the presence of high concentrations of gas hydrate in correspondence of important seafloor slope. The dissociation of gas hydrate could change the petrophysical characteristics of the subsoil triggering slopes, which already occurred in the past. Consequently, it is required to improve knowledge about the behavior of the gas hydrate system in a function of complex natural phenomena before the exploitation of this important resource.

scholarly journals A review of the gas hydrate distribution offshore Chilean margin

2021 ◽  
Vol 230 ◽  
pp. 01007
Author(s):  
Ivan Vargas-Cordero de la Cruz ◽  
Michela Giustiniani ◽  
Umberta Tinivella ◽  
Giulia Alessandrini
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
The Other ◽  
Hydrate Dissociation ◽  
Hydrate Reservoir ◽  
Gas Hydrate Reservoir ◽  
Submarine Slides ◽  
Seismic Lines ◽  
Natural Laboratory ◽  
Chilean Margin

In last decades, the Chilean margin has been extensively investigated to better characterize the complex geological setting through the acquisition of geophysical data and, in particular, seismic lines. The analysis of seismic lines allowed identifying the occurrence of gas hydrates and free gas in many places along the margin. Clearly, the gas hydrate reservoir could be a strategic energy reserve for Chile, but, on the other hand, the dissociated of gas hydrate due to climate change could be an issue to face. Moreover, this region is characterized by large and mega-scale earthquakes that may contribute to gas hydrate dissociation and consequent submarine slides triggering. In this context, Chilean margin should be considered a natural laboratory to study the hydrate system evolution.

scholarly journals OBS Data Analysis to Quantify Gas Hydrate and Free Gas in the South Shetland Margin (Antarctica)

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3290 ◽  
Author(s):  
Sha Song ◽  
Umberta Tinivella ◽  
Michela Giustiniani ◽  
Sunny Singhroha ◽  
Stefan Bünz ◽  
...  
Keyword(s):  
Velocity Field ◽  
Wave Velocity ◽  
Gas Hydrate ◽  
P Wave ◽  
Ocean Bottom ◽  
Ocean Bottom Seismometer ◽  
S Wave ◽  
Free Gas ◽  
Hydrate Reservoir ◽  
Gas Hydrate Reservoir

The presence of a gas hydrate reservoir and free gas layer along the South Shetland margin (offshore Antarctic Peninsula) has been well documented in recent years. In order to better characterize gas hydrate reservoirs, with a particular focus on the quantification of gas hydrate and free gas and the petrophysical properties of the subsurface, we performed travel time inversion of ocean-bottom seismometer data in order to obtain detailed P- and S-wave velocity estimates of the sediments. The P-wave velocity field is determined by the inversion of P-wave refractions and reflections, while the S-wave velocity field is obtained from converted-wave reflections received on the horizontal components of ocean-bottom seismometer data. The resulting velocity fields are used to estimate gas hydrate and free gas concentrations using a modified Biot‐Geertsma‐Smit theory. The results show that hydrate concentration ranges from 10% to 15% of total volume and free gas concentration is approximately 0.3% to 0.8% of total volume. The comparison of Poisson’s ratio with previous studies in this area indicates that the gas hydrate reservoir shows no significant regional variations.

Numerical Simulation on Natural Gas Production From Gas Hydrate Dissociation by Depressurization

2012 ◽  
Author(s):  
Tao Yu ◽  
Weiguo Liu ◽  
Jiafei Zhao ◽  
Yongchen Song ◽  
Yu Liu
Keyword(s):  
Gas Hydrate ◽  
Gas Production ◽  
Absolute Permeability ◽  
Hydrate Dissociation ◽  
One Dimensional ◽  
Hydrate Reservoir ◽  
Gas Hydrate Reservoir ◽  
Calculation Results ◽  
Dissociation Model ◽  
Set Up

The paper presented a numerical model on the gas hydrate production by depressurization. During the simulation a one-dimensional dissociation model applied to a gas hydrate reservoir was set up to simulate the process of gas hydrate production by depressurization. Based on the calculation results, influences of the gas pressure, saturation, porosity and absolute permeability on the production effect were studied respectively. The results obtained from the sensitivity analysis provide theoretical supported for the actual gas hydrate production.

scholarly journals Seepage from an arctic shallow marine gas hydrate reservoir is insensitive to momentary ocean warming

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Wei-Li Hong ◽  
Marta E. Torres ◽  
JoLynn Carroll ◽  
Antoine Crémière ◽  
Giuliana Panieri ◽  
...  
Keyword(s):  
Shallow Water ◽  
Gas Hydrate ◽  
Bottom Water ◽  
Short Term ◽  
Hydrate Dissociation ◽  
Bottom Water Temperature ◽  
Hydrate Reservoir ◽  
Marine Gas Hydrate ◽  
Gas Hydrate Reservoir ◽  
Hydrate Reservoirs

Abstract Arctic gas hydrate reservoirs located in shallow water and proximal to the sediment-water interface are thought to be sensitive to bottom water warming that may trigger gas hydrate dissociation and the release of methane. Here, we evaluate bottom water temperature as a potential driver for hydrate dissociation and methane release from a recently discovered, gas-hydrate-bearing system south of Spitsbergen (Storfjordrenna, ∼380 m water depth). Modelling of the non-steady-state porewater profiles and observations of distinct layers of methane-derived authigenic carbonate nodules in the sediments indicate centurial to millennial methane emissions in the region. Results of temperature modelling suggest limited impact of short-term warming on gas hydrates deeper than a few metres in the sediments. We conclude that the ongoing and past methane emission episodes at the investigated sites are likely due to the episodic ventilation of deep reservoirs rather than warming-induced gas hydrate dissociation in this shallow water seep site.

scholarly journals 2D micromodel study of clogging behavior of fine-grained particles associated with gas hydrate production in NGHP-02 gas hydrate reservoir sediments

2019 ◽  
Vol 108 ◽  
pp. 714-730 ◽  
Author(s):  
Shuang C. Cao ◽  
Junbong Jang ◽  
Jongwon Jung ◽  
William F. Waite ◽  
Timothy S. Collett ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Reservoir Sediments ◽  
Fine Grained ◽  
Hydrate Reservoir ◽  
Gas Hydrate Reservoir
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