Model Simulation for Generation and Migration of Methane Hydrate

Katoh, Arata; Nakayama, Keisuke; Baba, Kei; Uchida, Takashi

doi:10.1260/0144598001492193

Cited by 7 publications

(10 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The simulation model we used is the one-dimensional static model of Katoh et al (2000). The outline of this model is summarized as follows:…”

Section: Outline Of Simulation Modelmentioning

confidence: 99%

“…1, 2004 Model Simulation for Formation of Methane Hydrate 127 geothermal gradient we used is obtained from site survey wells BH-1 and BH-2 (4.1°C /100 m), because detailed measurement of formation temperatures were carried out in the sediments above the BGHS in these wells. The TOC values are set by smoothing the measured values and the values of methane generation potential are according to Katoh et al (2000). The sealevel change and tectonic movement were not considered because the remarkable evidence of paleobathymetric change could not be recognized by micro-paleontological analysis (unpublished data from the well report of the MITI Nankai Trough wells).…”

Section: Application To the Nankai Troughmentioning

confidence: 99%

“…However, geothermal gradient is modified so as to accord the BGHS with the actual base of methane hydrate zone. In this case, the geothermal gradient we used is 4.1°C /100 m, whereas the measured value is 3.4 °C/100 m. The TOC values are set by smoothing the measured values and the values of methane generation potential are according to Katoh et al (2000). The tectonic movement was not considered because the Blake Ridge was not significantly affected by major late Cenozoic tectonic activity (Wood and Ruppel, 2000).…”

Section: Simulation 5 (Advective Flow: 5 Kg/10 Kyr)mentioning

confidence: 99%

“…However, their simulation results have not been enough to explain the natural observations yet. On the other hand, Katoh et al (2000) had developed the one-dimensional static simulation model with simple expression for hydrate generation and empirical model for biogenic methane production. The physical process with burial is based on the basin simulator for petroleum exploration developed by Nakayama and van Siclen (1981).…”

Section: Introductionmentioning

confidence: 99%

“…Claypool and Kaplan, 1974;Kvenvolden and Barnard, 1983). In the present study, we try to simulate the natural examples of these two end-member models by using the one-dimensional static model of Katoh et al (2000). As the natural examples, we focused on two well-studied locations which represent typical hydrate setting.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Application of a Simulation Model for the Formation of Methane Hydrate to the Nankai Trough and the Blake Ridge: Natural Examples of Two End‐member Cases

Baba¹,

Katoh²

2004

Resource Geology

Self Cite

View full text Add to dashboard Cite

Abstract:Simulation experiments with a one-dimensional static model for formation of methane hydrate are used to demonstrate models of hydrate occurrence and its generation mechanism for two end-member cases. The simulation results compare well with experimental data for two natural examples (the Nankai Trough and the Blake Ridge).At the MITI Nankai Trough wells, the hydrate occurrence is characterized by strongly hydrated sediments developing just above the BGHS. Such occurrence can be reproduced well by simulation in which the end-member case of upward advective fluid flow from below the BGHS is set. The strongly hydrated sediments is formed by oversaturated solution with free gas which directly enters the BGHS by the upward advective fluid flow. The recycling of dissociated methane of preexisting hydrate also contributes to the increase of hydrate saturation.At the Site 997 in the Blake Ridge area, the hydrate occurrence is characterized by thick zone with poorly hydrated sediments and no hydrate zone developing above the hydrate zone. Such occurrence can be reproduced well by simulation in which the end-member case of in-situ biogenic production of methane in the sediment of methane hydrate zone is set. The distribution pattern of hydrate saturation is basically controlled by that of TOC. However, the hydrate concentration near the bottom of the hydrate zone is increased by the effect of recycling of dissociated methane of pre-existing hydrate. No hydrate zone expresses the geologic time needed until the local concentration of methane exceeds the solubility by gradual accumulation of in-situ biogenic methane with burial.

show abstract

“…The simulation model we used is the one-dimensional static model of Katoh et al (2000). The outline of this model is summarized as follows:…”

Section: Outline Of Simulation Modelmentioning

confidence: 99%

Section: Application To the Nankai Troughmentioning

confidence: 99%

Section: Simulation 5 (Advective Flow: 5 Kg/10 Kyr)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Application of a Simulation Model for the Formation of Methane Hydrate to the Nankai Trough and the Blake Ridge: Natural Examples of Two End‐member Cases

Baba¹,

Katoh²

2004

Resource Geology

Self Cite

View full text Add to dashboard Cite

show abstract

3‐D basin‐scale reconstruction of natural gas hydrate system of the Green Canyon, Gulf of Mexico

Burwicz

Reichel

Wallmann

et al. 2017

Geochem Geophys Geosyst

View full text Add to dashboard Cite

Our study presents a basin‐scale 3‐D modeling solution, quantifying and exploring gas hydrate accumulations in the marine environment around the Green Canyon (GC955) area, Gulf of Mexico. It is the first modeling study that considers the full complexity of gas hydrate formation in a natural geological system. Overall, it comprises a comprehensive basin reconstruction, accounting for depositional and transient thermal history of the basin, source rock maturation, petroleum components generation, expulsion and migration, salt tectonics, and associated multistage fault development. The resulting 3‐D gas hydrate distribution in the Green Canyon area is consistent with independent borehole observations. An important mechanism identified in this study and leading to high gas hydrate saturation (>80 vol %) at the base of the gas hydrate stability zone (GHSZ) is the recycling of gas hydrate and free gas enhanced by high Neogene sedimentation rates in the region. Our model predicts the rapid development of secondary intrasalt minibasins situated on top of the allochthonous salt deposits which leads to significant sediment subsidence and an ensuing dislocation of the lower GHSZ boundary. Consequently, large amounts of gas hydrates located in the deepest parts of the basin dissociate and the released free methane gas migrates upward to recharge the GHSZ. In total, we have predicted the gas hydrate budget for the Green Canyon area that amounts to ∼3256 Mt of gas hydrate, which is equivalent to ∼340 Mt of carbon (∼7 × 1011 m3 of CH4 at STP conditions), and consists mostly of biogenic hydrates.

show abstract

Seafloor nuclear magnetic resonance assay of methane hydrate in sediment and rock

et al. 2003

View full text Add to dashboard Cite

[1] Proton nuclear magnetic resonance (NMR) of liquid water can be used to indirectly detect and assay methane hydrate in opaque earth materials. It is also potentially useful for quantifying pore size control of hydrate formation, and for estimating in situ hydraulic permeability of hydrate-affected earth formations. The method is quantitative, nondestructive, and volumetrically averaging over a spatially selected region. In the first controlled validation of this measurement, we have used NMR to measure changes in the liquid water content of sediment and rock resulting from methane hydrate formation. Hydrates were artificially formed at the seafloor by introducing methane into tubes containing sediments or rock saturated with seawater; after several weeks the samples were visited by a remotely operated vehicle on which NMR equipment was mounted. Reduction of the NMR signal indicated hydrate had formed in the sample within a well-defined measurement volume. Hydrate content determined by NMR quantitatively predicted the volume of methane gas evolved during subsequent dissociation.

show abstract

Model Simulation for Generation and Migration of Methane Hydrate

Cited by 7 publications

References 5 publications

Application of a Simulation Model for the Formation of Methane Hydrate to the Nankai Trough and the Blake Ridge: Natural Examples of Two End‐member Cases

Application of a Simulation Model for the Formation of Methane Hydrate to the Nankai Trough and the Blake Ridge: Natural Examples of Two End‐member Cases

3‐D basin‐scale reconstruction of natural gas hydrate system of the Green Canyon, Gulf of Mexico

Seafloor nuclear magnetic resonance assay of methane hydrate in sediment and rock

Contact Info

Product

Resources

About