论文部分内容阅读
本文探讨了松辽盆地北部扶余地层水中微量金属元素与油气的分市关系。地球化学分析表明,地层水中元素含量组成特征是Fe>Sr>Zn>Mn>Cu>Nl>Cr。研究结果发现,地层水中微量金属元素含量与储层含油气性有明显的正相关关系。平面上扶余油层的含油气区,如三肇凹陷、朝长阶地、宾县王府凹陷、长春■北斜带等,除个别井区受淡化或泥岩压实排水影响外,Cu、Cr、Zn、Nl、Mn等微量金属元素含量较高,接近含油气区微量金属元素次之,远离含油气区微量金属元素含量最低。其中Sr元素含量在指示含气区尤为明显。垂向上随地层埋深增加,地层水中Sr、Cu、Zn、Nl、Cr等元素含量呈降低的趋势,代表扶余油层的原油主要富集于靠近──覆油源岩(青-段泥岩)的储层中,远离油源岩储层含油性变差。另外,垂向上地层水微量金属元素含量的几个高值带可能对应着扶余油层的几个主要含油带。
This paper discusses the sub-market relationship between trace metals and oil and gas in Fuyu formation water in the north of Songliao Basin. Geochemical analysis shows that elemental composition of formation water is characterized by Fe> Sr> Zn> Mn> Cu> Nl> Cr. The results show that there is a clear positive correlation between the content of trace metal elements in the formation water and the oil and gas in the reservoir. In addition to the desalination of individual wells or the compaction and drainage of mudstone, Cu, Cr, Zn, and Cu are the major oil-bearing zones in the Fuyu oil-bearing layer in the plane, such as the Sanzhao depression, The content of trace metals such as Nl and Mn is high, which is close to the trace metal elements in the hydrocarbon-bearing zone, and the content of trace metal elements far away from the hydrocarbon-bearing zone is the lowest. Among them, the content of Sr element is particularly obvious in the indicated gas-bearing area. The vertical distribution of Sr, Cu, Zn, Nl, Cr and other elements in the formation water decreases with the increase of the buried depth of the stratum. The crude oil representing the Fuyu oil layer is mainly concentrated near the source rocks (green mudstone) In reservoirs, oil reservoirs far away from source rocks deteriorate. In addition, several high-value bands of trace metal elements in the vertical formation water may correspond to several major oil-bearing bands in the Fuyu oil layer.