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呼图壁地下储气库部分区域地表垂直形变机理研究
李杰1) 李瑞1) 王晓强1) 石新朴2) 郑黎明1) 阿卜杜塔伊尔.亚森1) 孙小旭1) 陈述江1) 方伟1) 程瑞忠1)
1)新疆维吾尔自治区地震局,乌鲁木齐市新市区科学二街338号 830011;2)新疆油田管理局,新疆克拉玛依 831100;3)中国地震局地震研究所,武汉市武昌区洪山侧路40号 430071
摘要:
利用在呼图壁地下储气库开展的2013~2015年7期二等水准测量获得的高差数据,对由于地表气井压力变化影响而发生的地下储气库地表垂直变形进行了分析。研究表明,呼图壁地下储气库区的地表变形除了构造成因引起的盆地下沉以外,其他主要形变成因来源有2个方面:一个是呼图壁地区的地下水超采影响着该地区的地表垂直变化;另一个是储气库集采气期间井口压力变化影响下的地表沉降,根据计算,储气库每MPa气井压力变化影响到的地表变化约为0.625~1.125mm。
关键词:  地下储气库  地表垂直形变  气井压力变化  水准测量
DOI:
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基金项目:
Mechanism of Surface Vertical Deformation in Parts of the Underground Gas Storage Reservoir of Hutubi, Xinjiang, China
Li Jie1), Li Rui1) , Wang Xiaoqiang1 ) , Shi Xinpu2 ) , Qiao Xuejun3 ) , Zheng Liming1 ) , Abudutayier. Yaseng1 ) , Sun Xiaoxu1 ) , Chen Shujiang1 ) , Fang Wei1 ) , and Cheng Ruizhong1 )
1) Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China;2) Xinjiang Petroleum Administration, Karamay 831100, China;3) Institute of Seismology, China Earthquake Administration, Wuhan 430071, China
Abstract:
The underground gas storage ( UGS) in Hutubi ( HTB), Xinjiang is the largest gas storage reservoir in China and it has significance for coordinating the gas supply and demand relationship, peak-load regulation, implementation of strategic reserves, national security, and social economic sustainable development. Therefore, the deformation monitoring and simulation analysis of UGS operation has important technical support and reference value for the stability and safe operation of the underground gas storage. In this paper, we use the elevation data obtained from 7 periods of second-order leveling surveys in the Hutubi underground gas storage area in 2013 - 2015 to analyze the influence of gas well pressure on the vertical deformation of the underground gas storage reservoir. Research has shown that the absolute vertical subsidence rate is approximately in the range from 11.8mm to 16.1mm and the relative subsidence change is about 4.3mm, near the surface deformation of Hutubi underground gas storage area except for the annual subsidence rate of - 2.86mm by the basic influence of uplift of the Tianshan Mountains. Groundwater over-extraction in the Hutubi area also has an impact on the vertical variation of the surface in this region. The land surface change per unit pressure of gas storage has an impact of about 0.625 - 1.125mm. 17 scenes TerraSAR-X radar images acquired from August 2013 to August 2014 are exploited by Small Baseline Subset (SBAS) InSAR method to obtain the surface deformation time series during the operation of UGS in Hutubi, meanwhile combined with the pressure data of injection / production wells, the multi-point source Mogi model is used to simulate the UGS deformation field in Hutubi. The results show that the deformation characteristics of the whole UGS area is a discontinuous distribution with the peak deformation value of 10mm and - 8mm in the satellite line of sight (LOS) during gas injection and production, respectively and the retrieved deformation sequences correspond very well to the gas injection / production pressure changes. Based on the multi- point source Mogi model, we simulate the deformation process of HTB UGS, and with the adaptive forward search method, the radius and depth of point source are obtained. The simulated results indicate that when the average injection / production pressure of HTB UGS is 18MPa and 15MPa, LOS deformation is up to 7mm and - 4mm, respectively, and surface deformation is related to the density of gas injection (production) wells. The UGS gas distribution is not uniform, indicating that the structure of underground gas storage is complex. Thus using a more elaborate geomechanical model and other deformation observation data will be helpful for better simulating the UGS internal structure and explaining the mechanism of deformation.
Key words:  Underground gas storage  Vertical deformation  Gas well pressure change  Leveling survey  Small  Baseline  Subset (SBAS)  InSAR  Mogi  Model  Crustal deformation