?????????????????ó??????

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14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。

EVALUATION OF PRODUCING PERCENT OF DIFFICULT-TO-RECOVER RESERVES IN CHANGQING GAS FIELD

Reserves evaluation is the base of gas field de-velopment plan and its results directly relate to the development of a gas field, the reliability of every forecasted development index and the whole benefit, being an important basis for development decision. The carbonate gas reservoirs in Changqing are of great inhomogeneity and the degree of difficulty and easiness in producing reserves is obviously different between horizontal and longitudinal directions. On the basis of comprehensively researching the static data and initial static data, the classification criterion for the pays of Ma51 gas reservoir in Changqing gas field is set up. According to the criterion, the pays of every individual well are divided into I , II and III categories. The reserves of III -category pays are regarded as the difficult-to-recover reserves and those of I and Ⅱ -category pays as productible reserves by comprehensively considering the pore structure, log interpretation, production test and results of DDL-Ⅲ, PLT and Zonal testing. Thus the reserves of I and Ⅱ categories are the material base of conceptual design. But, the dynamic data show that the reserves of a part of Ⅲ-category pays are progressively produced with the continuation of the producing time of a partial exploration wells and with the increase in the production differential pressure. In this paper, the producing percent of the difficult-to-recover reserves of the Ⅲ-category reservoirs in Changqing gas field is effectively evaluated through statistical analysis of the gas output and production differential pressure of the Ⅲ -category pays in 14 wells in Changqing gas field and combining with numerical simulation and the material balance method for constant volume reservoir, providing, thus, a scientific basis for Changqing gas field development plan.