不封闭气藏建库库容设计

库容是衡量天然气地下储气库调峰能力的重要指标，是储气库工作气量、单井能力等指标设计的基础，准确计算储气库库容至关重要。，国内外目前储气库库容计算主要采用压降法等动态方法。气藏类型多为封闭性较好构造油气藏．榆林气田南区储气库为岩性气藏，其北部与长北合作区连通。借鉴国际上关于矿权的常规处理手段，计划在榆林南距长北一定距离建设储气库，为此需要开展榆林南区岩性气藏局部建设储气库库容优化设计研究。文中针对上述情况，采用压降法、产量不稳定分析法对榆林南区动储量进行计算，并通过气藏工程、数值模拟方法及现场压力传播干扰试验，研究了不同渗透率情况下的压力传播速度；在此基础上，对不同注采周期库区范围及库容进行了优化设计，为榆林南储气库防止气体溢漏及相关指标设计提供了基础依据．

Optimal design of underground gas storage capacity in unbounded gas reservoir

The capacity of underground gas storage is a very important index for measureing peak and cyclic load operation, it is a base of work tolerance of gas storage and single well capacity designing. It is very important to calculate the gas storage capacity con＇ectly. At present, dynamic method suth as differential pressure method is mainly adopted during the calculation of undergrnund gas sloragc capacity at home and abroad. Gas reseavoir type is mainly the structural hydrocarbon reservoir with good closure property. The underground gas storage in the southern part of Yuln Gas Fieht is a lithologic gas reservoir, and its northern part is connected with Changbei cooperation zone. In view of the conventional processing means of mining rights internationally, gas st.rage shouhl be buih up with a certain distance from southern Yulin to Changbei, which should conduct the optimal design of gas storage capacity of lithologic gas reservoir in South Yulin. This paper calculates the dynamic reserves for the southern part nf Yulin through the using of differertial pressure method and output destabilization analysis method. Pressure propagation velocity is analyzed at different penneabilities in terms of gas reservoir engineering, numerical simulation and fieht pressure propagation interference test. On the basis of that, gas storage range and storage capacity at different injection-production cycles are optimized, which provides a reference for avoiding the gas escape of gas storage and related index design in south Yulin.