Efforts heading for production of methane from methane hydrate resources-An outline of METI Exploratory Test Well "Nankai Trough" and future research program and development plan-

Nakamizu, Masaru; Namikawa, Takatoshi; Ochiai, Koji; Tsuji, Yosuke

doi:10.3720/japt.69.214

Cited by 14 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In 1999, MH-bearing sand-rich intervals within turbidite fan deposits were recognized from the eastern Nankai Trough based on the results of MITI (Ministry of International Trade and Industry; later Ministry of Economy, Trade and Industry; METI) "Nankai Trough" exploratory test wells 10,11,12,13 . 2-D seismic surveys extending to Tokai-oki to Kumanonada (2,802 km) were acquired in 1996 and 2001 by MITI and METI, respectively ( Figure 1).…”

Section: Background Of Methane Hydrate Research In the Eastern Nankaimentioning

confidence: 99%

“…In this area, it is widely observed the bottom simulating reflectors (BSR) that are interpreted to represent lower boundary of MH bearing sediments 4,5,6,7,8,9 . Previous studies in the "Nankai Trough" exploratory test well acquired in 1999 report that MH is developed in the pore space of the unconsolidated turbidite sands in deep submarine-fan sediments 10,11,12,13 . Based on this exploration result, a 2-D seismic survey in 2001 (2,802 km), 3-D seismic surveys in 2002 (a total area of three survey fields: 1,960 km 2 ), and a multiple well drilling campaign in 2004 were intensively conducted for the purpose of MH research by Japanese Government (Ministry of Economy, Trade and Industry; METI).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Reservoir characterization of methane hydrate bearing turbidite channel in the eastern Nankai Trough, Japan

et al. 2010

View full text Add to dashboard Cite

We have discussed reservoir architecture of methane hydrate (MH) bearing turbidite channels in the eastern Nankai Trough using 3-D seismic data and well log data. MH bearing turbidite channels exhibit complex patterns of strong reflection comprising patchy-like shape of positive and negative seismic reflectors. The groups of these reflectors obtained by picking represent the internal architecture of the channel complex that can be roughly classified into three depositional sequences. According to a seismic sequence stratigraphic analysis, each depositional sequence results in the different depositional system implying that the reservoir architecture of the turbidite channels varies corresponding to the sedimentary conditions as well as the topographic changes in the study area. Compared with well log data, the thickness of the turbidite channel at ß2 well in the southwestern part of the study area is much greater than that of ß1 well in the northeastern part. However, the depositional sequences of the northeastern part represent sand-dominated turbidite sediments ensuring that the reservoir potential is high despite the relatively smaller thickness of the turbidite channels.For constructing a geological frame model, we examined further details of reservoir characteristics of the turbidite channels around ß1 well. The identified bottom frame of the several channels is oriented along north-to-south and northnortheast-to-south-southwest directions, which coincide with the directions of paleo-current flows determined by the seismic sequence stratigraphic analysis. An interval velocity between BSR (bottom simulating reflector) and the top of the MH bearing sediments is obtained from a high-density velocity analysis. The distributions of the higher interval velocity are identified above the bottom frame of channels in the northeastern part of the study area. The turbidite sediments in the northeastern side of channels are derived from the north-northeast direction of paleo-current flows, which is different from the sediment supply system compared with those of the northern side to southwestern side of the channels. Thus, the higher velocity anomalies in the northeastern side of the channels may be related to the different coarse sediments supply system which may lead to the different reservoir architecture of the turbidite channels.

show abstract

Section: Background Of Methane Hydrate Research In the Eastern Nankaimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reservoir characterization of methane hydrate bearing turbidite channel in the eastern Nankai Trough, Japan

et al. 2010

View full text Add to dashboard Cite

show abstract

“…Log response and hydrate saturation in total pore space by acoustic velocity for PSW-1. Arrows show the hydrate zones (modified afterNakamizu et al, 2004).…”

mentioning

confidence: 99%

Overview of the MITI Nankai Trough Wells: A Milestone in the Evaluation of Methane Hydrate Resources

Tsuji¹,

Ishida²,

Nakamizu³

et al. 2004

Resource Geology

Self Cite

123

View full text Add to dashboard Cite

Bottom-simulating reflectors suggestive of the presence of methane hydrates are widely distributed below the ocean floor around Japan. In late 1999, drilling of the MITI Nankai Trough wells was conducted to explore this potential methane hydrate resource and a Tertiary conventional structure. The wells are located in the Northwest Pacific Ocean off Central Japan at a water depth of 945 m. A total of six wells were drilled, including the main well, two pilot wells, and three post survey wells at intervals of 10-100 m. All wells except the first confirmed the occurrence of hydrates based on loggingwhile-drilling, wire-line logging and/or coring using a pressure and temperature coring system in addition to conventional methods. Based on the various well profiles, four methane hydrate-bearing sand-rich intervals in turbidite fan deposits were recognized. Methane hydrates fill the pore spaces in these deposits, reaching saturation of up to 80 % in some layers. The methane hydrate-bearing turbiditic sand layers are less than 1 m thick, with a total thickness of 12-14 m. The bottom depth of high hydrate concentration correlates well with the depth of the bottom-simulating reflector. Based on these exploration results, the Japanese government inaugurated a 16-year methane hydrate exploitation program in 2001.

show abstract

Gas Hydrate Drilling in the Nankai Trough, Japan

Yamamoto

2022

World Atlas of Submarine Gas Hydrates in Continental Margins

View full text Add to dashboard Cite

Efforts heading for production of methane from methane hydrate resources-An outline of METI Exploratory Test Well "Nankai Trough" and future research program and development plan-

Cited by 14 publications

References 1 publication

Reservoir characterization of methane hydrate bearing turbidite channel in the eastern Nankai Trough, Japan

Reservoir characterization of methane hydrate bearing turbidite channel in the eastern Nankai Trough, Japan

Overview of the MITI Nankai Trough Wells: A Milestone in the Evaluation of Methane Hydrate Resources

Gas Hydrate Drilling in the Nankai Trough, Japan

Contact Info

Product

Resources

About