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1971年以来,在大港地区唐家河油田、板桥油田和港中油田,陆续打了一批中深井(3000米左右)和超深井(大于4000米),钻开上、下第三系地层,岩性为砂泥岩剖面。为了保证钻井质量,采用盐水泥浆,泥浆矿化度约为10,000PPM,泥浆电阻率一般小于0.5欧姆米(18℃)。大港地区下第三系地层水矿化度约为1,000PPM,地层水电阻率为泥浆滤液电阻率的十几倍。因此,相对于本地区地层水而言,电阻率小于0.5欧姆米(18℃)的泥浆,属于盐水泥浆。
Since 1971, a number of deep wells (about 3,000 meters) and ultra-deep wells (over 4,000 meters) have been drilled in the Tangjiahe oilfield, Banqiao oil field and Hong Kong-Zhonghua oilfield in Dagang area to drill up and down the Tertiary strata and rock Sex is sand and mudstone profile. In order to ensure drilling quality, the use of salt mud, mud salinity of about 10,000PPM, mud resistivity is generally less than 0.5 ohm meters (18 ℃). The formation water salinity of the Lower Tertiary strata in Dagang is about 1,000 PPM. The formation water resistivity is more than ten times that of the mud filtrate. Therefore, mud with resistivity of less than 0.5 ohm (18 ° C) relative to formation water in the area belongs to brine slurry.