Abstract: In this paper, the 7 phase flow gravity data of Hutubi underground gas storage were used and classical adjustment overall calculation was adopted to obtain the relative gravity variations at each monitoring point in the study area, which combined with the related gas storage injection-production pressure data to obtain the response relationship image between the temporal and spatial characteristics of the gravity field and the injection-production pressure of the area. Finally, based on the dynamic change data of the gravity field observed on the surface of Hutubi underground gas storage, the CGI algorithm (Compact Gravity Inversion) for spatial distribution of anomalous bodies of underground density change was used to invert the subsurface material density change image of Hutubi gas storage and the morphological and structural distribution characteristics of the storage body. The study showed that according to the different injection-production changes of underground gas storage in different periods, the simulation calculation showed that the optimal depth of underground density change of Hutubi gas storage was about 3500m, and the maximum density change of underground material medium was about ±0.7kg/m-3. The images of density changes in different periods could also clearly reflect the NW-SE trend of the internal structure of the gas storage and the morphological structure distribution of the internal storage tectonics was consistent with the geological structure of Hutubi gas storage.

Key words: Hutubi gas storage, time-varying microgravity, medium density, injection-production pressure

摘要： 本文利用呼图壁地下储气库7期流动重力资料，采用经典平差整体计算，得到研究区域内各监测点的相对重力变化量，结合储气库注采压力相关数据，获取该区域重力场时空变化特征与注采压力之间响应关系图像，最后以呼图壁地下储气库地表观测的重力场动态变化数据为基础，采用地下密度变化异常体空间分布的CGI算法（Compact Gravity Inversion）反演呼图壁储气库地下物质密度变化图像及库体的形态构造分布特征，研究表明，根据不同时期地下储气库注采变化量不同，模拟计算得出呼图壁储气库地下密度变化最佳深度为3500m左右，其地下物质介质密度变化最大值约为±0.7kgm-3。不同时期密度变化图像也可清晰反应出该储气库内部构造结构呈NW-SE走向以及库体内构造形态结构分布与呼图壁储气库地质构造分布特征相吻合。

关键词: 呼图壁储气库, 时变微重力, 介质密度, 注采压力