毛管压力曲线在确定砂岩气藏气水界面中的应用

Capillary pressure curves to determine gas-water contact in sandstone reservoirs

何云峰 张艾

He Yunfeng Zhang Ai

中国石化 西北油田分公司 雅克拉采气厂, 新疆 库车 842017

Yakela Gas Production Plant, SINOPEC Northwest Company, Kuqa, Xinjiang 842017, China

由于位于大涝坝2号构造苏维依组上气层边部的S45井未钻遇气水界面，在储量计算中取该井上气层砂层底界为气水界面，导致气水界面取值存在较大误差，严重影响了储量的真实性。根据毛管压力原理，采用逆向思维，根据含气饱和度计算含气高度，确定气藏的气水界面。应用该方法计算的大涝坝2号构造苏维依组下气层气水界面位置与实际情况较为吻合，用此方法计算了苏维依组上气层的气水界面，并据此计算了上气层储量。

In the drilling of well S45, which is on the edge of the Upper Suweiyi Formation in Dalaoba-2 structure, we did not find the gas-water contact, and took the sand bottom boundary of this well as gas-water contact in reserve calculation, which led to a big error and seriously affected the authenticity of reserves. This paper, based on the principle of capillary pressure, used reverse-hinking, and calculated the height of gas by gas saturation, and then determined the gas-water contact for gas reservoir. Using this method, we calculated the gas-water contact for the Lower Suweiyi Formation of Dalaoba-2 Structure, and it was nearly the same as the actual gas-water contact. We also calculated the gas-water contact for the Upper Suweiyi Formation, and then predicted reserve.

https://doi.org/10.11781/sysydz2016S1032