日本的吉井—东柏崎火山岩气田位于日本柏崎市东北10km处,属于新澙盆地西山—中央油区,是一狭长的背斜圈闭的绿色凝灰岩气田。绿色凝灰岩是以绿色为主的火山岩系的总称,包括玄武岩、流纹岩和安山岩及其碎屑。这种岩石有原生的裂隙,即熔岩爆发时的气孔及熔岩冷却产生的裂隙;还有 In Japan, the Yoshii-East Kashirasaki volcanic gas field is located at 10km northeast of Kashiwazaki, Japan and belongs to the Xishan-Central Oilfield in the Xindu Basin. It is a narrow-length green tuff gas field with anticlines. Green tuff is a general term for the green-dominated volcanic rocks, including basalts, rhyolite and andesite and its detritus. This rock has a native fissure, which is the porosity of the lava and the fissures created by cooling the lava; and