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建立了1种离子色谱抑制电导法测定气井实钻过程中钻井液中Cl-、SO24-、Ca2+、Na+4种关键离子质量浓度的方法。通过分析4种离子质量浓度在不同井深的变化规律,初步建立起四川盆地海相地层及流体识别解释标准,可以准确识别碳酸盐岩地层所含流体性质,判断是否钻遇气层或水层,还能通过所识别出的地层水类型来推断地下构造开放程度,确定气藏的保存条件。该方法灵敏度高、准确度好,有效丰富了地质勘探的检测手段,为四川盆地天然气钻探提供科学的依据。
A method for determining the mass concentration of key ions of Cl-, SO24-, Ca2 +, Na + in drilling fluid during gas-well drilling was established by ion chromatography inhibition conductivity method. By analyzing the variation of four kinds of ion mass concentration at different depths, the marine strata and fluid identification interpretation standard in the Sichuan Basin are initially established, which can accurately identify the fluid properties of the carbonate rock formation and determine whether the gas or water layer is drilled , But also through the type of formation water identified to infer the degree of openness of underground structures to determine the preservation conditions of gas reservoirs. The method has high sensitivity and accuracy, effectively enriches the detection methods of geological exploration and provides a scientific basis for natural gas drilling in the Sichuan Basin.