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Domestic E&P

Domestic Oil and Gas Fields

Hokkaido
Field name Yufutsu oil and gas field
Location Tomakomai City, Hokkaido
Discovered 1989
Commenced production 1996
Introduction The Yufutsu oil and gas field is in the eastern part of the city of Tomakomai in Hokkaido and stretches from the Tomakomai West Port to the Ishikari Plain to the west of Lake Utonai. It began with the success of the Minami Yufutsu SK-1 exploration well in 1988. Further exploratory drilling of wells in the Minami Yufutsu, Numanohata and Akebono areas was successful, leading to the opening of the Yufutsu oil and gas field. The Yufutsu field is one of the few oil and gas fields in the world with oil and gas reservoirs contained in natural fractures.

Hokkaido

Hokkaido

Akita
Field name Sarukawa oil field
Location Oga City, Akita Prefecture
Discovered 1958
Commenced production 1959
Introduction The Sarukawa oil field extends offshore from the northern coast of the Oga Peninsula in Akita Prefecture. This oil field resulted from the success of the 1958 Sarukawa SK-2 exploration well. More than 50 years have passed since the start-up of production and JAPEX has drilled more than 100 wells, including waterflood injection wells. The Sarukawa oil field was a significant find, strongly linked to the later discovery of oil and gas in the Kosei area, such as in Fukuyonezawa, Fukukawa and Nishi-Ogata.

Akita

Akita

Field name Ayukawa oil and gas field
Location Yurihonjo City, Akita Prefecture
Discovered 1989
Commenced production 1995
Introduction Located north of the Yurihara oil and gas field, the Ayukawa oil and gas field covers an area extending from the northern edge of the Yuri highlands to the Koyoshi River basin further north. The field began with the success of the Higashi Ayukawa AK-1 exploration well in 1989. Oil and gas produced in the Ayukawa area is transported by flow line to the Yurihara central base.

Akita

Akita

Field name Yurihara oil and gas field
Location Yurihonjo City, Akita Prefecture
Discovered 1976
Commenced production 1984
Introduction The Yurihara oil and gas field extends across the Yuri highlands on the northern slopes of Mt. Chokai, in the city of Yurihonjo, Akita Prefecture. The Yurihara SK-1 exploration well successfully discovered shallow oil and gas deposits in 1976. Continued exploration in the deep-lying green tuff layer was also successful and led to the opening of the Yurihara oil and gas field.

Akita

Akita

Yamagata
Field name Amarume Oil Field
Location Shonai Town, Yamagata Prefecture
Discovered 1960
Commenced production 1960
Introduction The Amarume oil field is located 10 km southeast of Sakata City. The field originated from the success of the Amarume SK-1 exploration well drilled in 1960.

Yamagata

Yamagata

Niigata
Field name Iwafune-oki oil and gas field
Location Approximately 4km offshore from the mouth of the tainai River, tainai city, Niigata Prefecture
Discovered 1983
Commenced production 1990
Introduction The Iwafune-oki oil and gas field is the only offshore oil and gas field that is currently producing from offshore platform in Japan. It extends offshore near the mouth of the Tainai River in Tainai City, Niigata Prefecture. After the success of the Iwafune-oki SIM-1 exploration well in 1983, three further appraisal wells were drilled to confirm the extent of the oil and gas deposits, and made positive results. In 1989, we decided to develop the area, and in 1990 we built the Iwafune-oki platform, at a depth of 36m, and a 21km seabed pipeline while drilling development wells.

Niigata

Niigata

Field name Higashi-Niigata gas field
Location Niigata City, Niigata Prefecture
Discovered 1959
Commenced production 1959
Introduction The Higashi-Niigata gas field extends across and offshore from the sand dunes to the east side of the Agano River mouth in Niigata City. The gas field originated after the 1959 Higashi-Niigata SK-1 exploration well discovered strong indications of gas in a shallow part of the Nishiyama Formation. As a result of further active exploration, we succeeded in producing large amounts of gas from new deposits, including those in the lower parts of the Nishiyama Formation, upper and lower parts of the Shiiya Formation, and the Teradomari Formation. The Higashi-Niigata gas field is one of Japan's largest gas fields in terms of structural size and the number of gas deposits.

Niigata

Niigata

Field name Shiunji Gas Field
Location Shibata City, Niigata Prefecture
Discovered 1962
Commenced production 1963
Introduction The Shiunji gas field is located 8 km north of Shibata City in a sand dune area. This gas field originated from the success of the Shiunji SK-1 exploration well in 1962.

Niigata

Niigata

Field name Katakai gas field
Location Ojiya City, Niigata Prefecture
Discovered 1960
Commenced production 1960
Introduction One of JAPEX's main gas fields, the Katakai gas field is located in a range of hills, between 150m and 200m high, stretching from Koshiji-machi in the city of Nagaoka to the city of Ojiya. The gas field traces back to the success of the Ojiya SK-1 and Katakai SK-1 exploration wells in 1960. The first development was in shallow deposits at a depth of 1,000m, but the Katakai SK-8 exploration well in 1978 discovered deep-lying gas deposits in the green tuff layer. Since then, several exploration wells have been drilled to confirm the extent of the green tuff formation.

Niigata

Niigata

Field name Yoshii gas field
Location Kashiwazaki City, Niigata Prefecture
Discovered 1968
Commenced production 1968
Introduction The Yoshii gas field is located in the Chuo oil belt that stretches from the Nagaoka Okozu Waterway to the Yasuda area in the city of Kashiwazaki. The gas field had its origins in the success of the Yoshii SK-1D exploration well in producing gas from green tuff in 1968. Later, many exploration wells were drilled to confirm the extent of green tuff in the Yoshii, Myohoji and Yasuda areas.

Niigata

Niigata