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靖边气田具有低压、低渗、低丰度、非均质性强的特点且投产井产量低、递减快,部分井有地层水产出,开展生产井产水层特征研究并提出识别方法,是高效合理开发气藏的基本条件之一。为此,在对靖边气田北二区的五1气藏水层进行地质、测井特征的系统分析基础上,根据测试井段产水量的大小,将产水井划分为四类,以此建立了气水层识别的地质—测井标准。在对典型产水层测井特征进行归纳的基础上,利用判别分析方法建立了北二区马五1中气层、气—水层、水层、干层的识别方程,并对87个未知层段进行了识别。结果表明,北二区目前完钻井中存在气层52层,气水层9层,水层8层,干层17层,识别率达到83%以上。所建立的方法可以用于未知层段的属性识别,这为气藏产水区的研究和分布及气藏开发提供依据。
Jingbian gas field has the characteristics of low pressure, low permeability, low abundance and heterogeneity, with low production and rapid decline in production wells, and some wells with formation water production, so as to carry out research on the characteristics of production aquifers in production wells and propose identification methods One of the basic conditions for efficient and reasonable gas reservoir development. Therefore, based on the systematic analysis of the geological and logging features of the Wu 1 gas reservoir in Beier 2, Jingbian Gas Field, the production wells are divided into four types according to the amount of water produced in the test well section, so as to establish Geological - well logging criteria for gas-water layer identification. Based on the generalization of logging features in typical aquifer, discriminant analysis was used to establish the discriminant equation of Ma5-1 gas layer, gas-water layer, water layer and dry layer in Beier 2, and 87 unknown Layers have been identified. The results show that there are 52 gas layers, 9 gas and water layers, 8 water layers and 17 dry layers in the North Second Region. The recognition rate is above 83%. The established method can be used to identify the attribute of unknown interval, which provides the basis for the research and distribution of gas production area and gas reservoir development.