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储量评价是气田开发设计的基础 ,储量评价结果直接关系到气田开发规模、各项开发指标预测的可靠性及整体效益 ,是开发决策的重要依据。长庆碳酸盐岩气藏非均质性强 ,储量动用的难易程度在平面上和纵向上有明显的差别。我们在对静态资料及初期动态资料综合研究的基础上 ,建立了长庆气田马五1 气藏产层分类标准 ,依据标准将单井各产层划分为Ⅰ、Ⅱ、Ⅲ类 ,在综合考虑孔隙结构、测井解释、试气以及DDL—Ⅲ、PLT分层测试等成果的基础上 ,视Ⅲ类产层储量为难采储量 ,Ⅰ +Ⅱ类产层储量为可动储量。因此Ⅰ +Ⅱ类储量为方案设计的物质基础。但是随着部分探井生产时间的延续和生产压差的增大 ,动态资料显示部分Ⅲ类产层储量也开始逐步动用。文章通过对长庆气田 1 4口井的Ⅲ类产层的产气量与生产压差的统计研究 ,结合数值模拟和定容气藏物质平衡方法 ,对长庆气田Ⅲ类储层难采储量的动用程度进行了有效的评价 ,从而为长庆气田开发设计提供了科学的依据。
Reserves evaluation is the basis of gas field development and design. The results of reserves evaluation are directly related to the scale of gas field development, the reliability of prediction of various development indicators and overall benefits, which are important basis for development decision-making. Changqing carbonate gas reservoirs are characterized by high heterogeneity and ease of use of reserves in both horizontal and vertical directions. Based on the comprehensive study of static data and initial dynamic data, we set up the production classification standard of Ma-5 1 gas reservoir in Changqing gas field. According to the standard, the single-well production zones are divided into Ⅰ, Ⅱ and Ⅲ categories. Based on comprehensive consideration Pore structure, well logging interpretation, gas test, and DDL-Ⅲ and PLT stratification tests. The reserves of Class Ⅲ are regarded as difficult to reclaim reserves and the reserves of Class Ⅰ + Ⅱ are movable reserves. Therefore, Ⅰ + Ⅱ reserves are the material basis of the scheme design. However, with the extension of some exploration wells’ production time and the increase of production pressure difference, the dynamic data shows that the reserves of some type III formations have also begun to be used gradually. Based on the statistic study of gas production and production pressure of Class Ⅲ producing zone in 14 wells in Changqing gas field and the numerical simulation and material balance method of gas reservoirs with fixed volume, The degree of utilization has been effectively evaluated, thus providing a scientific basis for the development and design of Changqing gas field.