桥白气藏可动水实验研究  

MOVABLE WATER EXPERIMENTS OF QIAO-BAI GAS RESERVOIRS

作　　者：黄伟岗[1] 郭平[1] 姜怡伟[2] 毕建霞[2] 

机构地区：[1]"油气藏地质及开发工程"国家重点实验室.西南石油学院 [2]中石化中原油田分公司

出　　处：《天然气勘探与开发》2005年第2期39-42,i004,共5页Natural Gas Exploration and Development

基　　金：油气藏地质及开发工程国家重点实验室(西南石油学院)资助项目;编号PLN9924。

摘　　要：致密气藏一般束缚水含量高,但不少气井仍可产出水,这种现象很难解释。采用离心毛管压力法、气驱水动态法及核磁共振法确定气藏束缚水饱和度,测井方法确定原始含水饱和度,从而确定可动水饱和度大小。实际采用中原油田桥口和白庙致密气藏具有代表性的岩心渗流实验可知,随着气流速度的增大,岩心含水饱和度逐渐减小,气相有效渗透率逐渐增大,对于原始含水饱和度较高的气藏,其水饱和度再不是一个定值,这就解释了致密气藏的气井产水原因。Tight gas reservoirs usually have high content of irreducible water, but some gas wells also produce water. It is difficult to explain the phenomena. The centrifugal capillary pressure method, the performance method of gas-drive water, and the nuclear magnetic resonance method are used to determine the irreducible water saturation of the gas reservoir. The well logging method is used to determine the original water saturation. Then, the movable water saturation can be determined. According to the percolation experiments with the typical cores acquired from Qiaokou and Baimiao tight gas reservoirs of Zhongyuan Oilfield, the water saturation of the cores decreases and the effective permeability of gas phase increases gradually as the gas flow rate increases. Therefore, the water saturation is not a constant for a gas reservoir that has big original water saturation, which explains the reason why the gas wells in the tight gas reservoirs produce water.

关 键 词：实验研究 含水饱和度 动水 致密气藏 束缚水饱和度 束缚水含量 核磁共振法 有效渗透率 测井方法 中原油田 气流速度 产出水 压力法 动态法 代表性 气井 原始 岩心 增大 气驱 

分 类 号：P618.13[天文地球—矿床学]