Extraction of Methane Hydrate Concentrated Zone for Resource Assessment in the Eastern Nankai Trough, Japan

Saeki, Tatsuo; Fujii, Tetsuya; Inamori, T.; Kobayashi, Toshiaki; Hayashi, Minoru; Nagakubo, Sadao; Takano, Osamu

doi:10.4043/19311-ms

Cited by 54 publications

(37 citation statements)

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“…12 out of these 32 wells were cored, 16 of remaining were logged with logging while drilling (LWD) tools, 1 was equipped with temperature sensors and in remaining 2 wireline tools were used for logging [37]. After this test detailed analysis of gas hydrate rich sand samples and their geophysical properties was carried out for production test [43]. Density-magnetic resonance technique used to determine gas saturation in gas reservoirs was used to estimate saturation from wireline logs [37].…”

Section: Resultsmentioning

confidence: 99%

Field Testing of Gas Hydrates - An Alternative to Conventional Fuels

Arora¹,

Cameotra²,

Balomajumder³

2015

J Pet Environ Biotechnol

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Section: Resultsmentioning

confidence: 99%

Field Testing of Gas Hydrates - An Alternative to Conventional Fuels

Arora¹,

Cameotra²,

Balomajumder³

2015

J Pet Environ Biotechnol

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“…Remaining indicator D higher velocity anomaly was detected in the velocity profile bottom . modified from Saeki et al, 2008 .…”

Section: Figmentioning

confidence: 99%

“…Deeper and older channels were interpreted as possible methane hydrate concentrated zones in which both of strong reflectors and high velocity anomalies were recognized. modified from Saeki et al, 2008 . International Conference on Gas Hydrates, Vancouver, Canada, 6 -10 July.…”

Section: Figmentioning

confidence: 99%

Methane hydrate exploration strategy and its progress

et al. 2010

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Methane hydrates, which are ice like materials and constructed with methane and water molecules, are spread widely under permafrost and deep water areas. It is thought that methane hydrates are ones of occurrence type of methane and can be future energy resources.BSR bottom simulating reflector occurs at the basement of GHSZ gas hydrate stability zone and therefore it is used to detect occurrences of methane hydrates in deep waters using reflection seismic data. At the same time, BSR is only the first step for methane hydrate exploration because BSR does not provide information about thickness, saturation and type of methane hydrate bearing zone. From the viewpoint of resource exploration, practical methods to analyze details of methane hydrate resource fields have been required.We constructed an effective strategy to delineate methane hydrate concentrated zones, of which reservoir are turbidite sand bodies, utilizing four following indicators in 3D seismic data A BSR, B turbidite sequence above BSR , C strong seismic reflectors and D relatively higher interval velocity, suggesting methane hydrate concentrated sand layers. It enabled us to delineate methane hydrate concentrated zones and evaluate their rock volume successfully in the eastern Nankai Trough as similar as prospects and leads in conventional oil and gas fields are delineated by geological and geophysical approaches.

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“…The stratigraphy in the Tokai-Atsumi-Kumano forearc basins was established through sequence stratigraphy and sedimentology using 2D/3D seismic, well log, and core data. It is found that a major depositional system of the sediments is a submarine fan turbidite system (e.g., [10][11][12][13][14][15]). Our target NGH reservoir is a methane hydrate-concentrated zone (MHCZ, Figure 2), which is characterized by strong amplitude and high velocity anomalies in seismic data, and the high resistivity interval in well log data (e.g., [15,16]).…”

Section: Geological Setting and Reservoir Architecture In The Second mentioning

confidence: 99%

Characterization and Prediction of the Gas Hydrate Reservoir at the Second Offshore Gas Production Test Site in the Eastern Nankai Trough, Japan

2017

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Abstract:Following the world's first offshore production test that was conducted from a gas hydrate reservoir by a depressurization technique in 2013, the second offshore production test has been planned in the eastern Nankai Trough. In 2016, the drilling survey was performed ahead of the production test, and logging data that covers the reservoir interval were newly obtained from three wells around the test site: one well for geological survey, and two wells for monitoring surveys, during the production test. The formation evaluation using the well log data suggested that our target reservoir has a more significant heterogeneity in the gas hydrate saturation distribution than we expected, although lateral continuity of sand layers is relatively good. To evaluate the spatial distribution of gas hydrate, the integration analysis using well and seismic data was performed. The seismic amplitude analysis supports the lateral reservoir heterogeneity that has a significant positive correlation with the resistivity log data at the well locations. The spatial distribution of the apparent low-resistivity interval within the reservoir observed from log data was investigated by the P-velocity volume derived from seismic inversion. The integrated results were utilized for the pre-drill prediction of the reservoir quality at the producing wells. These approaches will reduce the risk of future commercial production from the gas hydrate reservoir.

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Extraction of Methane Hydrate Concentrated Zone for Resource Assessment in the Eastern Nankai Trough, Japan

Cited by 54 publications

References 0 publications

Field Testing of Gas Hydrates - An Alternative to Conventional Fuels

Field Testing of Gas Hydrates - An Alternative to Conventional Fuels

Methane hydrate exploration strategy and its progress

Characterization and Prediction of the Gas Hydrate Reservoir at the Second Offshore Gas Production Test Site in the Eastern Nankai Trough, Japan

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