川西坳陷中段须家河组产出水判别及地球化学差异
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摘要
为了准确判别川西坳陷中段须家河组产出水的成因、明确产出水的地球化学差异,对该区气井生产数据与产出水地球化学特征进行分析,建立了研究区产出水的判别标准:凝析水——水气比小于0.2 (m~3/10~4 m~3),矿化度小于10 g/L;地层水——水气比大于0.2 (m~3/10~4m~3),矿化度大于10 g/L.同时发现研究区产出水地球化学特征存在显著差异:矿化度——凝析水矿化度均小于10 g/L,且以小于1 g/L为主,地层水矿化度大于10 g/L,且以大于70 g/L为主;水型——凝析水以CaCl_2型、MgCl_2型为主,地层水以CaCl_2型为主;主要离子含量——SO_4~(2-)含量凝析水略高于地层水,其余离子含量地层水高于凝析水.由于研究区地层水与凝析水地球化学特征存在显著差异,所以在开展地层水研究中必须首先区分地层水与凝析水,确保分析样品为地层水,才能保证结论可靠.
In order to determine the origin and geochemical difference of the produced water of the Xujiahe formation in middle part of western Sichuan depression, the production data and geochemical characteristics of the produced water were analyzed. The discriminant standard for produced water is determined: for condensate water, water-gas ratio is less than 0.2(m~3/104 m~3) and salinity is less than 10 g/L; for formation water, the water-gas ratio is more than 0.2(m~3/104 m~3) and salinity is more than 10 g/L. There are significant differences in geochemical characteristics of produced water in the study area. For salinity, condensate water salinity is less than 10 g/L, and is less than 1 g/L mainly, formation water salinity is greater than 10 g/L, and is greater than 70 g/L mainly.For water type, condensate water is mainly CaCl_2 type and MgCl_2 type, and formation water is mainly CaCl_2 type. About the main ion content, the SO_4~(2-)content in condensate water is slightly higher than formation water, and the other ion content in formation water is higher than condensate water. There are significant differences in geochemical characteristics between formation water and condensate in the study area. Therefore, in the study of formation water, for the reliable conclusions, it is necessary to distinguish formation water from condensate water first to ensure that the analytical sample is a formation water sample.
In order to determine the origin and geochemical difference of the produced water of the Xujiahe formation in middle part of western Sichuan depression, the production data and geochemical characteristics of the produced water were analyzed. The discriminant standard for produced water is determined: for condensate water, water-gas ratio is less than 0.2(m~3/104 m~3) and salinity is less than 10 g/L; for formation water, the water-gas ratio is more than 0.2(m~3/104 m~3) and salinity is more than 10 g/L. There are significant differences in geochemical characteristics of produced water in the study area. For salinity, condensate water salinity is less than 10 g/L, and is less than 1 g/L mainly, formation water salinity is greater than 10 g/L, and is greater than 70 g/L mainly.For water type, condensate water is mainly CaCl_2 type and MgCl_2 type, and formation water is mainly CaCl_2 type. About the main ion content, the SO_4~(2-)content in condensate water is slightly higher than formation water, and the other ion content in formation water is higher than condensate water. There are significant differences in geochemical characteristics between formation water and condensate in the study area. Therefore, in the study of formation water, for the reliable conclusions, it is necessary to distinguish formation water from condensate water first to ensure that the analytical sample is a formation water sample.
引文
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