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日本的主要油、气田分布在日本海的本州北部(图1)。它们处于“绿色凝灰岩地区”(Fujite,1973,1990),区内的厚层热液蚀变火山碎屑岩,尤其是浅绿色长英质的到镁铁质的凝灰岩和凝灰角砾岩是早中新世时沉积的,覆盖这些沉积物的是中—晚中新世泥岩,包括硬化页岩、黑色页岩,及晚中新世至上新世的砂岩。石油几乎全部发现在那些上第三系沉积总厚度大于5000m的深埋的沉积盆地中的火山碎屑岩和砂岩储层中,并被认为是由这些沉积盆地的中—上中新统泥岩产生的。 津轻盆地和那些油、气田一样处在同一个绿色凝灰岩地区,它位于秋田油区之北仅40km处(图1),津轻盆地的晚第三纪沉积的地层与秋田油区的非常相似,但是上第三系剖面的最大厚度仅约3000m,因而比秋田区的薄2000m。
Japan’s major oil and gas fields are located in the northern part of Japan in the Sea of Japan (Figure 1). They are in the “green tuff area” (Fujite, 1973, 1990) where the thick hydrothermal alteration pyroclastics, especially the pale-green feldspar-mafic tuff and tuff breccia Early-Miocene sediments that covered these deposits were mid-late Miocene mudstones, including sclerosing shales, black shales, and late Miocene to Pliocene sandstones. Almost all of the oil was found in pyroclastic and sandstone reservoirs in deep sedimentary basins with a total thickness greater than 5,000 m in the Tertiary, and is believed to have been produced by Meso-Upper Miocene mudstones in these sedimentary basins of. Like the oil and gas fields, the Tsugaru Basin is located in the same green tuff area just 40km north of the Akita oil zone (Figure 1). The late Tertiary sedimentary formations in the Tsugaru Basin are very similar to those in the Akita area , But the maximum thickness of the Tertiary section is only about 3000m, so it is 2000m thinner than the Akita area.