涩北气田多层气藏储量动用程度分析

Reserves producing level analysis of multilayer gas reservoir in the Sebei gas filed

柴达木盆地涩北气田合计含气小层介于54～90层,是典型的多层气藏,生产动态资料系统分析表明层间储量动用程度存在较大差异。采用实验模拟、气藏工程和数值模拟等多种方法研究了储层非均质性、层间储量分布、气井出水等对储量动用程度的影响。结果表明:层间的非均质性是影响多层气藏储量动用程度的主要因素,渗透率级差越大,低渗层储量动用程度越差。对于该类气藏,可以通过合理划分合采层系、优化射孔和优化配产等策略提高多层气藏储量的动用程度。

The Sebei gas field of Qaidam basin,with 54-90 gas-bearing layers,is a typical multilayer gas reservoir,and systematic analysis of production performance shows that there are big differences among interlayer reserves producing level.Methods of experimental simulation,gas reservoir engineering and numerical simulation have been adopted to study the influences of reservoir heterogeneity,interlayer reserve distribution and gas well water breakthrough on reserves producing level.The results show that interlayer heterogeneity is the main influencing factor on the reserves producing level of multilayer gas reservoir,with higher permeability contrast,worse reserves producing of low-permeability layers.For this kind of gas reservoir,the reserves producing level of multilayer gas reservoir can be improved by rational division of commingled layer series,perforation optimization,and production allocation optimization.