低渗透岩性气藏局部储气库库容量评价与工作气量优化

Evaluation of Storage Capacity and Optimization of Working Gas of Local Gas Storage in Low-Permeability Lithologic Gas Reservoirs

榆林气田低渗岩性气藏在储气库建设中属于先例，除论证库区封闭性以外，确定气库库容量与工作气量是储气库建设的核心问题。然而榆林气田南区山2气藏北部与长北合作区储层连通，榆林气田南区山2储层为大面积分布砂体的一部分。该气藏建设储气库主要面临3个方面的难点：一是低渗岩性气藏库容量的评价；二是榆林南局部建库，为防止气体外溢到长北区，如何在边界处设置缓冲区，确定南区储气库建设实际范围和库容量；三是低渗岩性气藏储气库工作气量设计与优化。通过动静态资料，首先准确评价了榆林气田南区动态储量，在此基础上通过压力波传播速度研究落实了局部储气库库容量．最后利用气藏工程多参数研究优化了局部储气库工作气量，为储气库建设提供技术支持。

Is is no precedent to construct a gas-storage in the permeability lithologic gas reservoirs of Yulin gasfield. In addition to the demonstration outside the reservoir area closed to determine the storage capacity of the gas storage working gas is the core issue of the construction of the gas stor- age. Yulin gas field, however, Southern District Hill 2 gas reservoir in northern the Changbei cooperation reservoir connectivity, Yulin gas field in the Southern District Mountain reservoir as part of a large area of distribution of sand body. The gas reservoir in the construction of gas storage diffi- culties facing three aspects, low permeability lithologic gas reservoir storage capacity evaluation; Yulin South local build gas storage to prevent gas spills into the the Changbei area, how the boundary set the buffer, to determine the the Southern zone gas storage to building actual range and stor- age capacity; Third, the design and optimization of low permeability lithologic gas reservoir gas storage working gas. In this paper, the dynamic and static data state, first accurate assessment of the dynamic reserves of the Southern District of Yulin gasfield, based on pressure wave propagation speed of the implementation of the storage capacity of the local gas storage, and finally the use of the gas reservoir engineering multi-parameter studies and optimization of the local gas libraries gas work, and it provide technical support for the construction of gas storage.