Thermal responses of a gas hydrate-bearing sediment to a depressurization operation

Yamamoto, Koji; Kanno, T.; Wang, X.-X.; Tamaki, Machiko; Fujii, Tetsuya; Chee, Soon Seong; Wang, X.-W.; Pimenov, V.; Shako, V.

doi:10.1039/c6ra26487e

Cited by 171 publications

(123 citation statements)

References 54 publications

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“…Figure 2 shows the detailed resistivity images at three wells (AT1-P, MC, and MT1) at the AT1 site. As shown in Figure 2, the target MHCZ (Unit IV) has a gross thickness of ∘ ; thus, well AT1-P was located slightly down-dip from wells AT1-MC and MT1 [22,23]. 61 m [22].…”

Section: Well Distribution and Formation Evaluationsmentioning

confidence: 99%

“…The porosities (Figure 3(b)) mainly ranging from 0.4 to 0.5 were determined from the density log. These are validated by the core derived porosities, which were measured under in situ confining pressure [22,23]. The absolute permeability (intrinsic permeability, Figure 3(c)) was estimated by using the KozenyCarman model and calibrated with the core data collected from hydrate reservoirs at the Eastern Nankai Trough [23,24].…”

Section: Well Distribution and Formation Evaluationsmentioning

confidence: 99%

“…61 m [22]. On the basis of lithological structure, the MHCZ is divided into three major subzones [22,23]. Unit IV-1 is composed of thin alternating beds of sand and mud in the upper part and sand layers with thicknesses of 30-70 cm.…”

Section: Well Distribution and Formation Evaluationsmentioning

confidence: 99%

“…Table 1 presents the main modeling parameters and physical properties for the AT1 site sediments at the Eastern Nankai Trough. These were based on the geophysical well logs and core samples analyses from published papers [4,17,22,23,27,28]. The permeability and porosity are based on the logging data of AT1-MC and the pressure core data of AT1-C as shown in Figure 3.…”

Section: Initial Conditionsmentioning

confidence: 99%

“…The initial temperature was specified to be 4 ∘ C at the seafloor [11,17,23]. The temperature profile was assigned to vary linearly as a function of depth with a geothermal gradient of 0.03 ∘ C/m.…”

Section: Initial Conditionsmentioning

confidence: 99%

See 4 more Smart Citations

Multiphase Flow Behavior of Layered Methane Hydrate Reservoir Induced by Gas Production

Yuan¹,

Xu²,

Xin³

et al. 2017

Geofluids

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Gas hydrates are expected to be a potential energy resource with extensive distribution in the permafrost and in deep ocean sediments. The marine gas hydrate drilling explorations at the Eastern Nankai Trough of Japan revealed the variable distribution of hydrate deposits. Gas hydrate reservoirs are composed of alternating beds of sand and clay, with various conditions of permeability, porosity, and hydrate saturation. This study looks into the multiphase flow behaviors of layered methane hydrate reservoirs induced by gas production. Firstly, a history matching model by incorporating the available geological data at the test site of the Eastern Nankai Trough, which considers the layered heterogeneous structure of hydrate saturation, permeability, and porosity simultaneously, was constructed to investigate the production characteristics from layered hydrate reservoirs. Based on the validated model, the effects of the placement of production interval on production performance were investigated. The modeling results indicate that the dissociation zone is strongly affected by the vertical reservoir's heterogeneous structure and shows a unique dissociation front. The beneficial production interval scheme should consider the reservoir conditions with high permeability and high hydrate saturation. Consequently, the identification of the favorable hydrate deposits is significantly important to realize commercial production in the future.

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Section: Well Distribution and Formation Evaluationsmentioning

confidence: 99%