含水层构造改建地下储气库盖层封闭能力评价研究——以冀中坳陷大5目标为例

Evaluation of Sealing Ability of Aquifer Caprock for Reconstructing Underground Gas Storages ——By Taking Da 5 Caprock in Jizhong Depression for Example

盖层封闭能力,是决定含水层构造能否成功改建为地下储气库的关键因素之一。以冀中坳陷大5目标为研究对象,在岩心、地震、测井、室内试验、地层测试、干扰试井等资料综合分析的基础上,从盖层岩性、厚度、物性特征、排替压力等方面开展封闭能力静态评价,从地层测试、干扰试井等方面开展封闭能力动态评价。综合静态、动态评价研究,建立含水层构造改建地下储气库盖层封闭能力评价模型。根据评价模型,认为大5目标盖层封闭能力良好,符合建库密封条件。该项研究对国内含水层储气库建设具有一定指导意义。

Sealing ability of cap rock was one of the key factor for determining whether the aquifer beds could be reconstructed as underground gas storage.Based on the analysis on core,seismic,logging,laboratory experiment,formation testing and interference testing data,sealing ability of Da 5Cap Rock in Jizhong Depression was taken as the object of study,its sealing ability was dynamically evaluated from the aspects of petrology characteristics,thickness,physical properties,displacement pressure and etc,based on the static and dynamic evaluations,a comprehensive evaluation model was established for the sealing ability of aquifer beds for constructing underground gas storage.According to the evaluation model,it is considered that the sealing ability of Da 5Caprock is good,which can meet the requirements for reconstructing underground gas storage and the sealing ability of reconstruction.This study provides guidance for the reconstruction of aquifer gas storage in China.