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柴达木盆地北缘冷湖地区赋存大量深部油田水。分析结果显示,冷湖四号构造地区的油田水为CaCl_2型,具有较高Ca含量,一些成分还具有比较明显的区域分异特征。相比柴达木盆地西部,柴北缘油田水的矿化度、K、B、Li等明显偏低。油田水水化学特征系数指示了研究区地层具有良好的封闭性,主要化学组分的富集作用与浓缩作用密切相关。推测碳酸盐、硅酸盐在长期水—岩作用下的溶解对油田水主要化学成分有重要贡献,而区域断裂的发育导致少量样品中的高F含量。
In the northern margin of the Qaidam Basin, a large amount of deep oilfield water is stored in Lenghu area. The results show that the oilfield water in Lenghu No.4 tectonic zone is CaCl 2 type with high Ca content, and some components also have obvious regional differentiation characteristics. Compared with the water salinity of the northern margin of Qaidam Basin and the northern margin of Qaidam, K, B and Li are obviously lower. The hydrochemical characteristic coefficient of oilfield indicates that the strata in the study area have a good seal, and the enrichment of major chemical components is closely related to the enrichment. It is speculated that the dissolution of carbonates and silicates under the long-term water-rock interaction are important contributors to the major chemical composition of oilfield water while the development of regional faults leads to high F content in a few samples.