Application for new wireline formation evaluation method to the sandstones of Shiiya Formation in the METI Sado Nansei Oki wells

正博, 大澤; Wihardjo, Lukas U.; 裕之, 三石; 宏司, 村本; 義明, 石山

doi:10.3720/japt.70.347

Cited by 8 publications

(1 citation statement)

References 3 publications

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“…Sediment near the seafloor of the basin is composed mainly of hemipelagic silty clay, including thin layers of ash and turbidite sands (Katayama et al 1994;Hiruta et al 2009;Kakuwa et al 2013a, b). Because this basin is located west of one of the oil-gas fields along the coast of the Japan Sea, it is expected that the basin is potentially rich in fuel resources (Osawa et al 2005;Monzawa et al 2006).…”

Section: Geologic Settingmentioning

confidence: 99%

Physical and thermal properties of mud-dominant sediment from the Joetsu Basin in the eastern margin of the Japan Sea

et al. 2017

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on the sediment mineral composition. Conversely, the grain heat capacity and grain specific heat showed hardly any dependency on the mineral composition. We propose empirical formulae for the relationships between: thermal diffusivity and thermal conductivity, and heat capacity and thermal conductivity for the sediment in the Joetsu Basin. These relationships are different from those for mud-dominant sediment in the eastern flank of the Juan de Fuca Ridge presented in previous work, suggesting a difference in mineral composition, probably mainly in the amount of quartz, between the sediments in that area and the Joetsu Basin. Similar studies in several areas of sediments with various mineral compositions would enhance knowledge of the influence of mineral composition.

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Section: Geologic Settingmentioning

confidence: 99%

Physical and thermal properties of mud-dominant sediment from the Joetsu Basin in the eastern margin of the Japan Sea

et al. 2017

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Surface heat flow measurements in the eastern margin of the Japan Sea using a 15 m long geothermal probe to overcome large bottom-water temperature fluctuations

et al. 2023

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Accurate surface heat flow data are required for a wide range of geological and geophysical applications. However, sediment temperature measurements beneath the seafloor often involve large uncertainties owing to the influence of bottom-water temperature (BWT) fluctuations. Previous studies reported apparently negative geothermal gradients in the Joetsu Basin of the Japan Sea and suggested that BWT fluctuations disturbed sediment temperatures. To address this problem, we monitored BWTs in the Joetsu Basin over a 2 year period to determine the depth at which the influence of BWT fluctuations on sediment temperature becomes negligible. Combined with sediment thermal diffusivity data, we determined that the BWT fluctuations can disturb sediment temperatures to a depth of 2 m. We obtained heat flow values of 81–88 mW m− 2 by measuring sediment temperatures at depths > 2 m using a 15 m long geothermal probe. The measured heat flow values are inversely correlated with topography owing to the effect of topographic change on the geothermal structure near the seafloor. A two-dimensional geothermal structure model was constructed to account for the topography, yielding an estimated regional background heat flow of 85 ± 6 mW m− 2. This study provides two important guidelines for obtaining accurate surface heat flow data in marine areas with large-amplitude BWT fluctuations: (1) quantitative information regarding BWT fluctuations and sediment thermal diffusivity is required to evaluate the depth range to which BWT fluctuations affect sediment temperature; and (2) information regarding the lithology and consolidation state of seafloor sediments is required for effective penetration using a long probe.

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A review of petroleum system in the deep water area of the Toyama Trough to the Sado Island in the Japan Sea, based on the results of the METI Sado Nansei Oki drilling

伸昭¹,

光好²,

正博³

2006

J. JAPANESE. ASSOC. PETROL. TECHNOL.

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The petroleum system in the deep water of the Toyama Trough to the southwest offshore of the Sado Island in the Japan Sea was considered based on the analytical results of METI Sado Nansei Oki S and D drillings and their preliminary surveys.The middle Miocene Lower Teradomari and Nanatani Formations indicate good source rock potential 0.90 -2.98%TOC . The kerogen type is a mixture of Type II and III. The bitumens include organic matter from both marine and terrestrial sources, notably characterized by very abundant oleanane like the case of oils in the Kubiki area onshore Niigata.The oil sample collected from the Shiiya Formation of METI Sado Nansei Oki S is characterized by its high oleanane content. A seeped oil sample on the sea bottom, although heavily degraded, also indicates similar oleanane content and carbon isotope characteristics that can be correlated to the oil.The source rock of the oil is thought to be the mudstone of the Lower Teradomari and Nanatani Formations from the analytical results of the petroleum source potential, carbon isotopes and biomarker indices, especially the ratio of oleanane to norhopane content. The contribution of marine organic matter to the oil seems to be slightly higher than that to the mudstone in the Lower Teradomari and Nanatani Formations of the well. It suggests that the oil was derived from the source rocks of the same horizon that deposited in the basin center in comparison with the well location.The methane hydrate samples taken by preliminary sea bottom survey are referred to be thermogenic origin from the carbon isotope ratio. It can be isotopically correlated to headspace gas samples collected at 1900m and deeper zone of METI Sado Nansei Oki D well. This means that the deeper gas migrated to the surface very quickly without the appreciable input of shallow biogenic gas.Fluid inclusion analysis implies that the generated hydrocarbon was once trapped in the lower Teradomari Formation at METI Sado Nansei Oki D, then it migrated upward to the Shiiya sandstones through large faults and fi nally accumulated in the structural crest of the Shiiya horizon METI Sado Nansei Oki S . Part of the hydrocarbons leaked from the Shiiya Formation through a number of minor faults to form methane hydrates and many Direct Hydrocarbon Indicators DHI that are observed with three dimensional 3D seismic data.The kitchen area of the oil is estimated to be a syncline that locates west of the wells and is buried deeply along the Toyama Trough. It is suggested that the kitchen area provided hydrocarbons to deep water large structures and possibly to the onshore areas such as Kubiki Oil Field. The conditions required for oil accumulation in the Shiiya sandstone include the presence of deep faults for migration pathways and the absence of shallow fault that may leak hydrocarbons. Therefore 3D seismic is necessary to evaluate such geological condition.

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Application for new wireline formation evaluation method to the sandstones of Shiiya Formation in the METI Sado Nansei Oki wells

Cited by 8 publications

References 3 publications

Physical and thermal properties of mud-dominant sediment from the Joetsu Basin in the eastern margin of the Japan Sea

Physical and thermal properties of mud-dominant sediment from the Joetsu Basin in the eastern margin of the Japan Sea

Surface heat flow measurements in the eastern margin of the Japan Sea using a 15 m long geothermal probe to overcome large bottom-water temperature fluctuations

A review of petroleum system in the deep water area of the Toyama Trough to the Sado Island in the Japan Sea, based on the results of the METI Sado Nansei Oki drilling

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