地层温度的降低对苏里格气田地层压力的影响

The influenceof formation temperature decreasing on formation pressure in Sulige Gasfield

苏里格气田地质条件复杂,储层非均质性严重,呈现出典型的"低孔、低渗透、低压、低丰度、低产和难动用"的特征,地层压力以低压和异常低压为主,压力系数大部分小于0.90。地层温度降低是天然气藏异常低压形成的主控因素之一,但对其影响程度的定量计算一直没有很好的方法,运用高斯-赛德尔迭代原理,在考虑气体压缩因子的情况下研究了地层温度降低对天然气藏地层压力的影响,克服了前人按照理想状态气体进行研究的弊端,并以苏里格气田为例进行了计算说明,计算结果表明:早白垩世末以来,地层温度下降造成苏里格气田地层压力下降约23.08%,是苏里格气田异常低压形成最主要的影响因素。

Zhang Wenzhong,The Key Laboratory of Marine Reservoir E-volution and Hydrocarbon Accumulation Mechanism,Ministry of Education,China University of Geosciences (Beijing),Beijing City,100083,ChinaBecause of complex geologic setting and reservoir heterogeneity,the characteristics of Sulige Gasfield show low porosity,low permeability,underpressure,minor production and difficult to develop.The great majority of gas wells present low pressure and subnormalpressure,and pressure coefficient is less than 0.90.Decreas...