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大宛齐油田油层连通性差,加之断层切割,是一个多油水系统的断块岩性油藏,各油藏之间没有统一的油水界面。通过对地层水化学特征开展研究,可以为更好地认识与研究该类油藏的形成及分布特征提供相关参考与佐证。地层水的化学特征是受成岩环境以及后期改造作用综合影响的结果,地层水的化学特征的形成过程与油气成藏密切相关;开展地层水化学特征研究,有利于油气的勘探与开发。大宛齐油田地层水总矿化度主要分布在200000mg/L-250000mg/L,属于盐水和卤水;PH值6-8,为弱酸-弱碱性,地层水基本为CaCl2水型。通过对大宛齐油田地层水的PH值、常规成分、主要元素及其组合统计分析,反映了大宛齐油田地层水的特征,并揭示了其与油气分布的关联。对于油层埋深浅,地层水矿化度较大且变化明显的油田水研究具有一定的借鉴意义。
Da-wan-qi oil field connectivity is poor, combined with fault cutting, is a multi-oil and water system fault block lithology reservoir, there is no uniform oil-water interface between the reservoir. Through the study of formation water chemical characteristics, it can provide relevant references and evidences for better understanding and researching the formation and distribution characteristics of these reservoirs. The chemical characteristics of formation water are the result of diagenetic environment and the combined effects of later alteration. The formation process of formation water chemical characteristics is closely related to the formation of oil and gas. Carrying out the study of formation water chemistry is beneficial to the exploration and development of oil and gas. The total salinities of formation water in Dawanqi Oilfield are mainly distributed in the range of 200000mg / L to 2500000mg / L, which belongs to salt water and brine. The PH value is 6-8, which is weak acid - weakly alkaline. The formation water is basically CaCl2 water type. Through the statistical analysis of PH value, conventional composition, main elements and their combination of formation water in Dawanqi Oilfield, the characteristics of formation water in Dawanqi Oilfield are revealed and their correlation with oil and gas distribution is revealed. It is of some reference to the study of oilfield water with shallow depth, large salinity of formation water and obvious changes.