Importance of Neogene siliceous rocks as the source of petroleum in Japan

Journal Article · Sat Dec 31 23:00:00 EST 1988 · Energy Sources (New York); (USA)

DOI:https://doi.org/10.1080/00908318908908948· OSTI ID:5632013

Aoyagi, K ^[1]; Omokawa, M ^[2]

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1. Exploration Dept., Japan Petroleum Exploration Co. Ltd., 2-17-22 Akasaka, Minatoku, Tokyo, 107 (JP)
2. Research Center, Japan Petroleum Exploration Co. Ltd., 1-2-1 Hamada, Chibashi, 260 (JP)

Major oil and gas fields in Japan are located in the area from the central Hokkaido through northeast Honshu. Most productive horizons are generally found in formations of the late Middle Miocene (approximately 12-10 Ma) Onnagawa provincial stage of Japan. These formations are composed mainly of hard mudstone, siliceous shale, diatomaceous mudstone, marlite, and acidic pyroclastic rocks. Source rock potentials in argillaceous rocks of the Miocene Ohdoji Formation in Aomori, the Onnagawa Formation in Akita, and the Lower Teradomari Formation in Niigata show the highest values as compared with other formations in these areas. Average contents of organic carbon and hydrocarbons of siliceous sediments such as diatomite, siliceous shale, and chert in the Aomori basin indicate the higher values as compared with other argillaceous sediments. Diatoms, which appeared in the later Cretaceous, are the principal primary producers of organic matter in the marine environment during the Cenozoic. Organic components and biological productivity show that diatoms have been the most important source of petroleum during the Neogene in Japan.

• OSTI ID: 5632013
• Journal Information: Energy Sources (New York); (USA), Journal Name: Energy Sources (New York); (USA) Vol. 11:2; ISSN 0090-8312; ISSN EGYSA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020100* -- Petroleum-- Reserves-- (-1989)
03 NATURAL GAS
030100 -- Natural Gas-- Reserves-- (-1989)
ALGAE
ASIA
CHEMICAL COMPOSITION
CHROMOPHYCOTA
DIATOMS
ENERGY SOURCES
FOSSIL FUELS
FUELS
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
JAPAN
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS FIELDS
OIL FIELDS
PETROLEUM
PETROLEUM DEPOSITS
PLANTS
RESERVES
RESERVOIR ROCK
RESOURCES