针对某气田的长输管道,选择具有代表性的管段,通过定点取样和原位测量的方法对土壤理化性能进行分析。按照调查方案,测定了土壤电阻率、杂散电流、含水量、氯离子含量、硫酸盐含量、碳酸钙含量、pH值、氧化还原电位。用多项指标评价方法所得结果与用土壤电阻率单项指标评价的结果基本一致。该气田管道土壤环境大部分为沙地,与盐碱地相比,沙地环境下的电阻率偏高,含水量偏低,土壤腐蚀性较轻。 Aiming at the long-distance pipeline in a gas field, the representative pipe sections are selected to analyze the physical and chemical properties of the soil by point sampling and in situ measurement. Soil resistivity, stray current, water content, chloride ion content, sulfate content, calcium carbonate content, pH value and redox potential were measured according to the survey program. The results obtained by using multiple index evaluation methods are basically the same as the results evaluated by single index of soil resistivity. Most of the pipeline soil environment in the gas field is sandy land. Compared with saline-alkali land, the resistivity in sandy land is high, the water content is low, and the soil is less corrosive.