石油与天然气地质 ›› 1982, Vol. 3 ›› Issue (1): 89-98.doi: 10.11743/ogg19820111

• 论文 • 上一篇    

江陵凹陷油田水分类的几个化学问题

史先谦1, 江乃雄2, 李庆芝2   

  1. 1. 中国科学院上海冶金研究所;
    2. 上海计算数学研究所
  • 收稿日期:1981-04-23 出版日期:1982-03-25 发布日期:2012-01-16

SOME CHEMICAL PROBLEMS IN CLASSIFICATION OF OIL FIELD WATER OF JIANGLING DEPRESSION

Shi Xianqian1, Jiang Naixiong2, Li Qingzi2   

  1. 1. Shanghai Institute of Metallurgy, Academia Sinica;
    2. Shanghai Institute of Computational Techniques
  • Received:1981-04-23 Online:1982-03-25 Published:2012-01-16

PDF (PC)

393

被引次数

4

摘要：

油田水是一个复杂的化学体系,它与地层深部油气藏存在许多相关的信息。油田水分类作为油田水地球化学的一个重要命题,它不仅是个理论问题,而且是个找油的实际问题。已经有过很多研究,其中苏林分类法有较广的影响。苏林认为:CaCl2和NaHCO3型水是油田水型。稍后的舍尔勒分类,考虑了水中阴阳离子的排列顺序以及硫酸盐的饱和程度。

Abstract:

The Study of class separation in chemical composition of oil field water in Jiangling depression,using a multidimentional space non-linear mapping method combined with linear statistic analysis,is our example of applying a computerized pattern recognition technique to the classification study of oil field water.The Jiangling depression is a part of Jianghan Basin developed in Cretaceous-Tertiary.During its process of continuously sinking,having a dry or semi-dry,restricted or semi-restricted interior lake sedimentary environment,the calcium mirabilite rocks and salt rocks were developed.Faults are well developed in the depression,so the oil water relations are complicated.It was proved by the above mentioned pattern recognition method that there is a good correlation between the concentration of divalent ions(such as SO42-,Ca2+,Mg2+,etc.)in the oil field water of Jiangling depression and oil-bearing conditions,and the positive correlation between SO42- and the oil-bearing conditions seems different from the traditional viewpiont of oil field water investigations.In order to interpret this result,we measured some solubility relations in the solution of simulated oil field water samples.It was noticed that in oil field water samples of Jiangling depression the Ca2+ concentration often decreased with the increasing of SO42- concentration.It seemed to indicate that many of the sambles were almost CaSO4 saturated.We measured the solubility of CaSO4 in some simulated solutions and plotted a diagram of the equation log(f±(0))/(f±)-(ΣC)1/3 to show the saturation region of CaSO4 in oil field water based on a diffuse-lattice model of electrolyte solutions.This experiment proved that the concentration of CaSO4 in the water associated with oil was often saturated or nearly saturated.Therefore the concentration of CaSO4 in oil field water can be used as a good indicator for oil exploration and development in this region.Since salt and gypsum are well developed in the reservoir rocks in Jiangling depression, which is shown by geological conditions,it is not difficult to understand this relation.