江汉油田的石油主要储藏于砂岩地层中,26年前,在王场构造附近钻了一口扩边井——王19井,却意外地在泥岩井段出了油。王19井潜四段第一油组与第二油组之间的地层(井深2676～2945米)主要是由油浸泥岩与盐岩组成的韵律层。于井深2685.5米磨鞋钻进时,发现泥浆槽面 The oil in Jianghan Oilfield was mainly stored in sandstone formations. Before 26 years ago, Wang 19 oil well, a well that had been drilled in the vicinity of the Wangchang structure, unexpectedly produced oil in the mudstone section. The strata (depth 2676 ~ 2945 m) between the first oil reservoir and the second oil reservoir of the fourth member of the Well No. 4 in the fourth well are mainly rhythm layers composed of oil-bound mudstone and salt rock. 2685.5 meters in deep well grinding shoes when drilling, found that the mud groove surface