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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。
The Sulige gas field is characterized by complex geological conditions and serious reservoir heterogeneity, showing the typical characteristics of “low porosity, low permeability, low pressure, low abundance, low yield and difficult to use”. The formation pressure is characterized by low pressure and abnormal low pressure Mainly, the pressure coefficient is mostly less than 0.90. The decrease of formation temperature is one of the main controlling factors for the formation of abnormal low pressure in natural gas reservoirs. However, there is not a good way to quantitatively calculate the extent of its influence. Using the Gauss-Seidel iteration principle, considering the gas compression factor, The effect of temperature reduction on formation pressure in natural gas reservoirs overcomes the disadvantages of predecessors’ research on gas in ideal state. Taking Sulige gas field as an example, the calculation shows that the temperature of formation has decreased since the end of Early Cretaceous The pressure in the Sulige gas field decreased by about 23.08%, which was the most important factor for the formation of abnormal low pressure in the Sulige Gas Field.