鄂尔多斯盆地蟠龙地区长6地层水化学特征

Hydrochemical Characteristics of Chang 6 Formation in Panlong Area,Ordos Basin

地层水既是地下流体的重要组成部分,同时也是含油气盆地中油气藏流体系统中不可或缺的组成部分,因此研究地层水的化学特征对评价油气保存条件的好坏具有深刻意义。通过对蟠龙地区延长组可靠的地层水数据进行处理分析,笔者发现,地层水矿化度较高,平均值为57164.3 mg/L,Cl^-、Ca^2+以及K^+、Na^+占优势,水型为CaCl2型,钠氯系数、脱硫酸系数、碳酸盐平衡系数较小,反映出研究区处于停滞环境中,还原作用较强烈,地层封闭性不错,储集层保护条件好,利于油气保存。

Formation water is not only an important part of underground fluids,but also an indispensable part of reservoir fluid systems in oil-bearing basins.Therefore,studying the chemical characteristics of formation water is of profound significance for evaluating the quality of oil and gas preservation conditions.Through the analysis and analysis of reliable formation water data of the Yanchang Formation in the Panlong area,the author found that the formation water had a high degree of mineralization,with an average of 57164.3 mg/L.Cl^-,Ca^2+,K^+,and Na^+ were dominant,the water type was CaCl2,the sodium-chlorine coefficient,desulfurization coefficient,and carbonate equilibrium coefficient were small,reflecting that the study area was in a stagnant environment,with strong reduction effects,good formation sealability,good reservoir protection conditions,and favorable for oil and gas preservation.