靖边气田马五1气藏水层特征及识别.

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。

CHARACTERISTICS AND RECOGNITION OF THE WATER FORMATION IN M51 GAS RESERVOIR OF JINGBIAN GAS FIELD

Jingbian gas field, which has strong heterogeneity, has the properties of low permeability, pressure, abundance, and production rate. Meanwhile its production rate decreases rapidly, and water breaks through in some wells. So, the researches on characteristics of aquifer should be carried out to figure out the identification method, which has become essential for the reasonable and efficient development of gas reservoirs. The water producing wells are classified into 4 categories by the water production of specified section, based on the systems analysis of geological and logging features in the M51 of Block Bei 2 in Jingbian gas field, and the criterion of the geological well logging to identify the gas and water zone was then build up. On the basis of generalizing well logging characteristics of typical aquifer, this paper established an equation by discriminate analysis for identification of gas layers, gas water layers, aquifers and dry layers, and identified 87 unknown layers by this equation. The result showed that there were 52 gas layers, 9 gas water layers, 8 aquifers and 17 dry layers in the drilled wells, over 83% of unknown layers were identified, and the identification method could be used for identifying the properties of unknown layers, which provided the foundation for researching the distribution of aquifer regions and the exploitation of gas reservoirs.