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Geomagnetism and Aeronomy - The study of normal geomagnetic background fields is the premise and basis for obtaining local geomagnetic anomalies caused by changes in underground pressure during gas... 相似文献
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Hutubi Underground Gas Storage (UGS) is an important part of China''s West-East Gas Pipeline Project. Its production safety also plays an essential role in ensuring peaking, emergency and reserve of natural gas in the region. Geophysical observations and research conducted on Hutubi UGS provide significant support for understanding the operation status and ensuring safe operation of the UGS. Since the beginning of the construction of Hutubi UGS and its production, several works including gas field observation experiments,rock experiments and numerical simulations have been conducted. Preliminary observational results show that during the initial operation stage of the UGS, the "breathing phenomenon" in caprock and microseismicity in the vicinity are closely related to the operation of the gas storage. However,rock experiments and numerical simulations show that these activities may gradually weaken with the multi-cycle operation of gas storage. The impact of the operation of Hutubi UGS in the surrounding areas is gradually weakening, and its operation tends to be stable.Implementing long-term and multi-method geophysical observations is able to provide us a better understanding of the relationship between the operation of UGS and regional geological hazards. On this basis, the corresponding geomechanical model can be established to form an effective risk management mechanism for gas storage operation. Thus, it is of great significance to understand its operation status, monitor storage conditions, guide production and operation, and ultimately guarantee the safe production of the gas storage. 相似文献
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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 总被引:1,自引:0,他引:1
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。 相似文献
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Magnetic Anomalies on the Tree Trunks 总被引:2,自引:0,他引:2
Kletetschka Gunther Žila Vojtěch Wasilewski Peter J. 《Studia Geophysica et Geodaetica》2003,47(2):371-379
Magnetic measurements of soil and tree bark adjacent to a busy highway revealed a significant variation in the concentration of magnetic particles with distance from the highway. Further more, forest-facing tree-bark contains significantly more magnetic particles than road-facing tree-bark. Magnetic particles were detected both on the bark of the maple trees and in the first centimeter of the soil cover (O/A horizon). Stability of saturation isothermal magnetization (SIRM) and hysteresis parameters of the soil indicates the presence of single domain (SD/PSD) magnetic carriers. Measurements of the tree bark hysteresis parameters and SIRM detect a significant lower coercivity component that we interpret to be an indication of more abundant pseudo-single domain (PSD) type magnetic grains. Magnetic measurements around the perimeters of eight tree trunks reveal magnetic carriers whose distribution is antipodal to the source direction (highway). We interpret our observation by adopting an air circulation model, where suspended PSD/SD particles are carried in the air stream. The air stream from the heavy traffic lowers the amount of moisture on the tree trunk surfaces facing the highway and thus reduces an adhesive potential on this side. Therefore, more particles can stay on the moist side of the trunk protected from the direct airflow. 相似文献
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利用新疆呼图壁地下储气库地表盖层由13个点位组成的形变监测网的前5期GPS观测资料,研究地下储气库注采过程中地表盖层的变形响应。通过获取地下储气库运行过程中地表盖层形变的三维时间序列,并结合井口压力数据,区分地下储气库在不同过程中的变形信号。研究结果表明,地表盖层在储气库注采过程中水平方向上存在明显的“呼吸效应”,储气库每MPa气井压力变化在注、采周期内对地表变形造成的影响在水平方向上分别达到1.02、1.24mm,垂直方向分别达到-1.11、0.86mm。 相似文献
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选取恩施台、涪陵江东台、石柱黄水台以及武隆仙女山台2012年1月至2017年11月地磁数据进行异常分析,得到各个台站的地磁谐波振幅比和加卸载响应比计算结果,并结合2017年11月23日重庆武隆M5.0地震震中附近地质构造背景分析地震前后地磁异常现象。分析结果认为大部分地磁谐波振幅比变化特征类似于地电阻率的变化特征,表现为"下降-转折-上升"过程。本次地震大致发生在转折上升的初期阶段,其中震中距较小的台站地磁谐波振幅比变化趋势不同步,但变化幅度大致相同,而震中距较大的台站地磁谐波振幅比变化趋势较为同步,变化幅度较大。此外,研究还表明震前地磁加卸载响应比异常高值在时空分布上与震中位置具有很好的对应关系。 相似文献
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Thomas P. Van Biersel Bill C. Bristoll Robert W. Taylor James Rose 《Ground Water Monitoring & Remediation》2002,22(1):116-120
In 1993, during the removal of a diesel and a gasoline underground storage tank at the municipal garage of the Village of Kohler, Sheboygan County, Wisconsin, soil testing revealed environmental contamination at the site. A site investigation revealed the possibility of a second on-site source of petroleum contamination. Limited historical data and the present usage of structures within the suspected source area precluded the use of most invasive sampling methods and most geophysical techniques. A fluxgate magnetometer survey, followed by confirmatory excavation, was conducted at the site. The fluxgate magnetometer survey identified nine possible magnetic anomalies within the 18 × 25 m area. The subsequent excavation near the anomalies revealed the presence of five paired and two individual 2000 L underground storage tanks. The fluxgate magnetometer survey, although affected by the proximity of buildings, was able to detect the buried tanks within 3 m of the brick structures, using a 1.5 × 1.5 m sampling array. 相似文献
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通过对2014年4月20日安徽霍山MS4.3地震前地下流体异常进行回溯性分析,总结了流体异常特征。结果显示,在时间上,流体异常具有配套性、阶段性特征,震前11个月异常月频次逐渐增加;震前3个月异常月频次加速上升,进入临震阶段,震前1.5个月,部分异常结束,异常月频次转折下降;在空间上,流体异常主要集中在震中200km范围内,且外围流体异常主要表现为趋势上升或低值,震中附近流体异常表现为突升。震前流体异常还与测项有关,水温、水化测项映震效果较好,水氡、氢气突升异常短临意义明显。 相似文献
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The magnetic map of Slovakia used in the paper was compiled as part of a project titled Atlas of Geophysical maps and profiles in 2001. The residual magnetic data were analyzed to produce Curie point estimates. To remove distortion of magnetic anomalies
caused by the Earth’s magnetic field, reduction to pole transformation was applied to the magnetic anomalies using the magnetization
angle of the induced magnetization. Anomalies reduced to the pole tend to be better correlated with tectonic structures. We
applied a 3-km upward continuation to the residually compiled magnetic anomalies in order to remove effects of topography.
The depth of magnetic dipoles was calculated by an azimuthally averaged power spectrum method for the entire area. Such estimates
can be indicative of temperatures in the crust, since magnetic minerals lose their spontaneous magnetization according to
Curie temperature of the dominant magnetic minerals in the rocks. The computed Curie point depths in the Slovakia region vary
between 15.2 km and 20.9 km. Heat flow higher than 100 mWm−2 occurs at the central volcanics and eastern part of Slovakia, where the Curie point depths values are shallow. The correlation
between Curie point depths, heat flow and crust depth was investigated for two E-W cross sections. Heat flow and Curie point
depth values are correlated with each other however, these values could not be correlated with crust depth. The Curie point
isotherm, which separates magnetic and non-magnetic parts of the crust, is represented in two cross sections. 相似文献
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从山西省地下流体(水位、水化)的基础观测资料入手,在核实异常的基础上,总结了1989年以来山西大同—阳高6.1级,内蒙古包头6.4级,河北张北6.2级地震前的异常反应和震后认识,并对今后的地震预报提出了一些建议。 相似文献