涩北二号疏松砂岩气田出水规律研究

涩北二号气田是柴达木盆地的大型生物气田，岩性疏松，气层多而薄，存在边水，气水关系复杂。气田开发过程中气井出水普遍，出水量差异较大，产量递减较快，因此，认清气田出水规律是确保气田控水稳产的基础。以生产动态数据为基础，研究了气田各层组产水特征及水气比上升规律；通过气井出水水源的多因素合理识别，将气田出水井归结为4 种类型；并通过边水水侵量及水侵速度的计算，明确了气田不同层组边水水侵类型，认识了不同层组不同方向上的水侵速度不同；最后，通过地层累计含水率分布的计算，有效地确定了不同层组水侵前缘位置，为下一步气田控水、气井产量合理调整及气藏稳产奠定了基础。

The Study on Water-producing Features of Sebei-2 Gas Field

The Sebei-2 Gas Field is a big biogenic gas field in Qaidam Basin.In this gas field,there exist loose rock,multiple thin gas layers,edge water and complex gas-water distribution.In the process of gas field production,it is common that gas wells produce water,the amounts of water produced from gas wells vary in a wide range,and the outputs of gas wells decline fast.A clear understanding of the features of gas wells producing water ensures the stable production of gas field.Based on production data,the features of gas wells producing water and ratio of rising water-gas ratio rising in gas wells and groups are carefullystudied.Water-producers are thus classified into four types according to the water sources and water amount produced.The types of water encroachment in different groups in this field are identified based on the calculation of aquifer influx and water influx rate.At last,the location of the water-encroachment front in different groups can be effectively identified with the aid of the distribution of the in-place cumulative water percentage of each group.