裂缝性油藏改建地下储气库注采能力评价

陕京二线的开工建设，大大提高了西部油气田向华北地区大中城市供气的能力。作为该项目的配套工程，在华北地区建设大型地下储气库，确保对京、津、冀等的平稳供气，具有非常重要的意义。通过前期库址筛选，任丘油田任11井古潜山油藏具有改建地下储气库的有利条件。改建储气库研究过程中，对改建后储气库注采能力的评价，是一项非常重要的工作。文章详细分析了任11井古潜山油藏的地质特征和开发特点，并在此基础上应用常规的油藏工程等方法，对古潜山油藏注采气能力进行了评价研究。通过油藏工程理论计算和类比采液指数方法，估算的采气指数都很高，反映任11井古潜山油藏裂缝系统的渗流能力相当好，认为地层基本达到了无限供流的条件。

EVALUATION OF INJECTION/RECOVERY CAPACITY FOR UNDERGROUND GAS STORAGE REFORMED BY FRACTURED RESERVOIR 1)

The gas delivering ability from the west oilfields to the big and medium cities in the north China area is improved greatly since the second Shaanxi-Beijing gas pipeline is built. As the matching engineering of the project, the large underground gas storages are constructed, which is very important to guarantee stable gas delivering to Beijing, Tianjing and Jidong area. With early optimization of storage positions, it is found the palaeo-buried hill reservoir with Well Ren 11 is favor to be reformed into underground gas storage. And the evaluation of injection/recovery capacity for the reformed underground gas storage is very important work in the study to build the storage. Therefore, the geological features and the exploiting characteristics of the palaeo-buried hill reservoir with Well Ren 11 are analyzed carefully. Based on the analysis, using the conventional methods such as reservoir engineering etc., the injection/recovery capacity of the palaeo-buried hill reservoir is evaluated. With the theoretical calculation of reservoir engineering and the analogy method of fluid productivity index, the estimated gas productivity index is very high, which means the percolation property of the fracture system is rather good for the palaeo-buried hill reservoir. It is thought the reservoir meets the conditions of unlimited fluid supply.