Diagenesis of the neogene sediments in the southwestern part of the Tsugaru basin, northern honshu, Japan.

Jingu, Hiroshi; Ujiié, Yoshihiro

doi:10.5575/geosoc.96.421

Cited by 4 publications

(7 citation statements)

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“…The diagram shows that the Akaishi Formation samples are characterized by the type III kerogen, which associated with terrestrial organic matter. This result contrasts with the kerogen determination of Jingu and Ujiié (1990), who identified a type II kerogen that originated from marine organic matter in sediments of the Akaishi Formation. The marked shift from original type II to type III kerogen in marine sediments likely indicates a degradation of the organic matter (Pratt, 1984; Tyson, 1995).…”

Section: Discussioncontrasting

confidence: 99%

“…The Tsugaru Basin is a Neogene sedimentary back‐arc basin located at the northwestern side of Honshu Island in Japan (Jingu & Ujiié, 1990; Ujiié, 1995) (Figure 1). A simplified geological map and a stratigraphic column of the outcropping formations in the southern sectors of the Tsugaru Basin are shown in Figures 2 and 3.…”

Section: Geological Settingmentioning

confidence: 99%

“…This unconformity marks the beginning of an erosional process and a transition to terrestrial volcano‐clastic sedimentation. This transition resulted in the deposition of tuffaceous siltstones and sandstones in the Pliocene (Higashimeya Formation) and acidic volcanic and volcano‐clastic deposits associated with the activity of the Iwaki volcano in the Pleistocene–Holocene (Jingu & Ujiié, 1990).…”

Section: Geological Settingmentioning

confidence: 99%

“…A simplified geological map and a stratigraphic column of the outcropping formations in the southern sectors of the Tsugaru Basin are shown in Figures 2 and 3. The basin comprises a Neogene to Quaternary succession composed of non‐marine, deep‐marine, and volcanic deposits (Jingu & Ujiié, 1990; Ujiié, 1995). This succession is geologically correlated to other successions distributed in various basins of northern Japan, and these successions all provide a record of the evolution of the Japan Sea from approximately 23 Ma to present (Iijima, Tada, & Watanabe, 1988).…”

Section: Geological Settingmentioning

confidence: 99%

“…In this area, Middle-Late Miocene siliceous sedimentary rocks are considered the most productive horizons for hydrocarbon generation and have been studied by various geological investigations (Aoyagi & Omokawa, 1992;Kimura, Shikazono, Kashiwagi, & Nohara, 2004;Ujiié, 1995). Additionally, other studies performed on the outcropping Middle-Late Miocene formations in Akita Prefecture (Kimura et al, 2004;Tada, 1991;Waseda, Tsuji, Kajiwara, & Nishido, 1995;Watanabe, Yamamoto, & Imai, 1994;Yamamoto, 1994) and in Aomori Prefecture (Aoyagi & Omokawa, 1992;Jingu & Ujiié, 1990;Tada, Watanabe, & Iijima, 1986;Ujiié, 1995) have integrated sedimentological data with geochemical data to assess the hydrocarbon potential of these formations and to understand the factors that determined the accumulation and preservation of organic matter in sediments; these assessments have also focused on the Japan Sea's evolution. However, in some areas of Akita and Aomori Prefectures, these studies have not yet been performed and minimal subsurface data is available.…”

Section: Introductionmentioning

confidence: 99%

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Sedimentary and geochemical characterization of Middle–Late Miocene formations in the Neogene Tsugaru Basin, Japan by means of DTH27‐1 well sediment analysis

2020

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Middle-Late Miocene age siliceous formations outcropping along the northwestern side of Honshu Island are considered prospective source rocks for hydrocarbons. An analysis of geophysical, sedimentological, and geochemical properties is essential to evaluate the formations' source potential, and to understand the factors that determined the accumulation and preservation of organic matter. This study investigates the Middle-Late Miocene geological record of the Tsugaru back-arc basin, located in the western part of Aomori prefecture, through an analysis of a 200 m long portion of a core from the DTH27-1 well; this core is composed of the diatomaceous siltstones of the Akaishi Formation and the siliceous mudstones of the Odoji Formation. Sedimentological and geophysical characterization showed that the Akaishi Formation's diatomaceous siltstones are mostly massive and bioturbated, have low magnetic susceptibility, and demonstrate moderate natural radioactivity. Although the Odoji Formation's siliceous mudstones are massive, they have exceedingly low magnetic susceptibility and high natural radioactivity. Geochemical data from a Rock-Eval Pyrolysis such as total organic carbon and generative potential (S1 + S2) revealed that, in the Tsugaru area, only the Odoji Formation is a likely prospective source rock for hydrocarbons. On the other hand, T max values indicate that both the formations are thermally immature for generating hydrocarbons. The difference between the Akaishi and Odoji Formation in the sedimentological facies, in terms of the degree of bioturbation and the organic carbon content, indicates variations in lithological properties, such as porosity and grain size; moreover, this difference indicates a variation in the paleo-oxygenation of bottom waters, with the transition from oxygen-deficient conditions in the Middle Miocene to the more oxygenated conditions in the Late Miocene. Both the lithological and paleo-environmental factors possibly influenced the organic richness in the two formations.

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Section: Discussioncontrasting

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Sedimentary and geochemical characterization of Middle–Late Miocene formations in the Neogene Tsugaru Basin, Japan by means of DTH27‐1 well sediment analysis

2020

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Middle–late Miocene paleoenvironment of the Japan sea inferred by sedimentological and geochemical characterization of coeval sedimentary rocks

Martizzi

Chiyonobu

Hibi

et al. 2021

Marine and Petroleum Geology

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The hydrocarbon potential of the Miocene siliceous formations in Tsugaru Basin, northern Japan, based on the geochemical analyses

2021

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： Middle-late Miocene siliceous sedimentary formations are considered important targets for petroleum exploration in the North Paci c, including northwestern Honshu Island in Japan. In this study, we present data on the diatomaceous siltstones of the Akaishi Formation and the siliceous mudstones of the Odoji Formation from the DTH27-1 well in the Tsugaru Basin, southwestern Aomori Prefecture. Organic geochemical data from the Rock-Eval pyrolysis were used to evaluate the hydrocarbon potential of siliceous mudstones in western Aomori. S1+S2, TOC, and T max data indicate that the siliceous mudstones are prospective source rocks in this region. However, the low maturity of these formations indicates that formations of western Aomori Prefecture could not expel hydrocarbons. Although in this area productive source rock horizons are not present, siliceous mudstones with the same age of the Odoji Formation in the Tsugaru Peninsula could represent future targets for the hydrocarbon exploration in the Aomori Prefecture.

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Diagenesis of the neogene sediments in the southwestern part of the Tsugaru basin, northern honshu, Japan.

Cited by 4 publications

References 0 publications

Sedimentary and geochemical characterization of Middle–Late Miocene formations in the Neogene Tsugaru Basin, Japan by means of DTH27‐1 well sediment analysis

Sedimentary and geochemical characterization of Middle–Late Miocene formations in the Neogene Tsugaru Basin, Japan by means of DTH27‐1 well sediment analysis

Middle–late Miocene paleoenvironment of the Japan sea inferred by sedimentological and geochemical characterization of coeval sedimentary rocks

The hydrocarbon potential of the Miocene siliceous formations in Tsugaru Basin, northern Japan, based on the geochemical analyses

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