Multi-Well Exploration Program In 2004 For Natural Hydrate In The Nankai-Trough Offshore Japan

Takahashi, H.; Tsuji, Yosuke

doi:10.4043/17162-ms

Cited by 58 publications

(44 citation statements)

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“…Japan has a rigorous research plan and an advanced exploration program that has led the drilling of 36 wells in gas hydrate-bearing turbiditic sand reservoirs in the Nankai Trough off Japan's east coast (Takahashi and Tsuji, 2005). Fujii et al (2005) described the variety of gas hydrate occurrence found in the Nankai region, and Kurihara et al (2005) discussed the relative economic favorability of gas hydrates in different geologic settings.…”

Section: Introductionmentioning

confidence: 99%

“…This area has probably experienced the largest investment and most advanced field research activity because of the intensive Japanese effort to evaluate the potential and feasibility of gas production from hydrates. Following the discovery of hydrates and the drilling of an exploration well at a water depth of 945 m in 2000 (Takahashi et al, 2001), a multi-well exploration program was conducted in 2004 at 16 locations in three different sites (Kumano Basin, Second Atsumi Knoll and Offshore Tokai) at water depths of 720 m to 2,033 m ( Figure 12) that had been selected on the basis of the BSR signature (Takahashi and Tsuji, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Toward Production From Gas Hydrates: Current Status, Assessment of Resources, and Simulation-Based Evaluation of Technology and Potential

Moridis

Collett

Boswell

et al. 2009

SPE Reservoir Evaluation &Amp; Engineering

358

146

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Summary Gas hydrates (GHs) are a vast energy resource with global distribution in the permafrost and in the oceans. Even if conservative estimates are considered and only a small fraction is recoverable, the sheer size of the resource is so large that it demands evaluation as a potential energy source. In this review paper, we discuss the distribution of natural GH accumulations, the status of the primary international research and development (R&D) programs, and the remaining science and technological challenges facing the commercialization of production. After a brief examination of GH accumulations that are well characterized and appear to be models for future development and gas production, we analyze the role of numerical simulation in the assessment of the hydrate-production potential, identify the data needs for reliable predictions, evaluate the status of knowledge with regard to these needs, discuss knowledge gaps and their impact, and reach the conclusion that the numerical-simulation capabilities are quite advanced and that the related gaps either are not significant or are being addressed. We review the current body of literature relevant to potential productivity from different types of GH deposits and determine that there are consistent indications of a large production potential at high rates across long periods from a wide variety of hydrate deposits. Finally, we identify (a) features, conditions, geology and techniques that are desirable in potential production targets; (b) methods to maximize production; and (c) some of the conditions and characteristics that render certain GH deposits undesirable for production.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Toward Production From Gas Hydrates: Current Status, Assessment of Resources, and Simulation-Based Evaluation of Technology and Potential

Moridis

Collett

Boswell

et al. 2009

SPE Reservoir Evaluation &Amp; Engineering

358

146

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“…Thrust and growth faults, as well as bottom-simulating reflectors (BSRs) suggestive of the presence of hydrate, have been extensively investigated since 1971 with seismic surveys, coring, and logging Takahashi and Tsuji, 2005;Tsuji et al, 2004;Uchida et al, 2004;Waseda and Uchida, 2004a,b). The total amount of gas in place in the eastern Nankai Trough is estimated to be 1.1 trillion (10 12 ) cubic meters (Fujii et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Hydro-bio-geomechanical properties of hydrate-bearing sediments from Nankai Trough

Santamarina

Dai

Terzariol

et al. 2015

Marine and Petroleum Geology

205

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a b s t r a c tNatural hydrate-bearing sediments from the Nankai Trough, offshore Japan, were studied using the Pressure Core Characterization Tools (PCCTs) to obtain geomechanical, hydrological, electrical, and biological properties under in situ pressure, temperature, and restored effective stress conditions. Measurement results, combined with index-property data and analytical physics-based models, provide unique insight into hydrate-bearing sediments in situ. Tested cores contain some silty-sands, but are predominantly sandy-and clayey-silts. Hydrate saturations S h range from 0.15 to 0.74, with significant concentrations in the silty-sands. Wave velocity and flexible-wall permeameter measurements on neverdepressurized pressure-core sediments suggest hydrates in the coarser-grained zones, the silty-sands where S h exceeds 0.4, contribute to soil-skeletal stability and are load-bearing. In the sandy-and clayey-silts, where S h < 0.4, the state of effective stress and stress history are significant factors determining sediment stiffness. Controlled depressurization tests show that hydrate dissociation occurs too quickly to maintain thermodynamic equilibrium, and pressureetemperature conditions track the hydrate stability boundary in pure-water, rather than that in seawater, in spite of both the in situ pore water and the water used to maintain specimen pore pressure prior to dissociation being saline. Hydrate dissociation accompanied with fines migration caused up to 2.4% vertical strain contraction. The firstever direct shear measurements on never-depressurized pressure-core specimens show hydratebearing sediments have higher sediment strength and peak friction angle than post-dissociation sediments, but the residual friction angle remains the same in both cases. Permeability measurements made before and after hydrate dissociation demonstrate that water permeability increases after dissociation, but the gain is limited by the transition from hydrate saturation before dissociation to gas saturation after dissociation. In a proof-of-concept study, sediment microbial communities were successfully extracted and stored under high-pressure, anoxic conditions. Depressurized samples of these extractions were incubated in air, where microbes exhibited temperature-dependent growth rates.Published by Elsevier Ltd.

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“…Very interesting is the advanced drilling and extracting technology experimented by Japanese project in the Nankai Trough. In order to not destabilize, with a vertical wall, the hydrate layers during the operation, a 90° bent exploring and extraction wells were successful employed, achieving the deposit by the side (Moridis et al, 2004;Moridis & Reagan, 2007a;Moridis & Reagan, 2007b;Moridis & Sloan, 2007;Moridis, 2008;Takahashi & Tsuji, 2005). This procedure moreover protects the ship bearing the extractive derrick, respect to an abrupt large accidental emission of gas that can cause the sinking of the navy or its fire (remember the Mexico Gulf disaster).…”

Section: The Role Of Methane Emissions On Ancient and Present Climatimentioning

confidence: 99%

“…The reservoirs of natural gas embedding the shale rocks are however very promising and can become an important energy source especially for the Countries that do not have direct access to other reservoirs (Howarth et al, 2001). New technology, analogous to that experienced for the extraction of methane from the hydrates (Takahashi & Tsuji, 2005) was recently proposed for the exploitation and intensive extraction of natural gas from shale rocks as a new important source. In fact very large field extensions of oil shales are present in the North of United States and Canada, sites that there are not subject to unstable conditions of foreign Countries (U.S. EPA, 2010c).…”

Section: Shale Rocksmentioning

confidence: 99%

The Role of Methane Emissions on Ancient and Present Climatic Changes

Barone¹,

Chianese²,

Riccio³

2011

Planet Earth 2011 - Global Warming Challenges and Opportunities for Policy and Practice

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Multi-Well Exploration Program In 2004 For Natural Hydrate In The Nankai-Trough Offshore Japan

Cited by 58 publications

References 0 publications

Toward Production From Gas Hydrates: Current Status, Assessment of Resources, and Simulation-Based Evaluation of Technology and Potential

Toward Production From Gas Hydrates: Current Status, Assessment of Resources, and Simulation-Based Evaluation of Technology and Potential

Hydro-bio-geomechanical properties of hydrate-bearing sediments from Nankai Trough

The Role of Methane Emissions on Ancient and Present Climatic Changes

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