低渗致密气藏地层压力评价方法适用性研究

Study on Applicability of Stratigraphic Pressure Evaluation Method for Low Permeability and Tight Gas Reservoirs

与常规气藏相比,低渗致密气藏具有低孔、低渗、含水饱和度高等特点,其地层压力评价方法与常规气藏有很大不同。本文以靖边下古气藏为例,针对其低渗致密的储层特性,分析了几种地层压力评价方法,通过对比各种废弃地层压力评价方法优缺点,优选二项式产能方程法评价靖边气田废弃地层压力,并针对该方法存在的问题提出了迭代改进方法。对未来类似的低渗致密气藏开发具有一定的指导意义。

Compared with conventional gas reservoirs, low permeability and dense gas reservoirs have the characteristics of low porosity, low permeability and high water saturation. The method of formation pressure evaluation is very different from conventional gas reservoir. In this paper, taking the Jingbian ancient gas reservoir as an example, this paper analyzes several reservoir pressure evaluation methods for the low permeability and dense reservoir characteristics. By comparing the advantages and disadvantages of various waste formation pressure evaluation methods, evaluation of waste formation pressure in Jingbian gas field by binomial deliverability equation method, and proposed an iterative improvement method for the existing problems of this method. Which is of great significance to the future development of low permeability and dense gas reservoirs.