排序方式: 共有98条查询结果,搜索用时 15 毫秒
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Seislog资料在赤水地区的应用 总被引:1,自引:0,他引:1
Seislog又称合成声波测井。在碳酸盐岩地区,Seislog资料对缝洞系统的预测非常有效,只要缝洞体中含有流体,它的速度必然比围岩的速度低,在Seislog剖面上反映为孤立、不连续的低速异常体。本文从Seislog资料处理的方法原理、处理步骤和实际应用几个方面进行了阐述。 相似文献
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大型桥梁地基基础安全监控系统研究 总被引:2,自引:0,他引:2
本文针对建立桥梁基础安全监控系统开展研究,探讨了系统目标及其构成,并就系统建立过程中在资料管理、可视化查询、资料解释与监控模型三方面常见的问题针对性地提出解决方法。如建立日志系统、将八叉树编码方式应用到监测系统测点的编号、建立监测值异常检出系统等,并给出了部分实例。 相似文献
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中国大陆科学钻探主孔4906米附近氦气体异常的解析 总被引:2,自引:4,他引:2
在中国大陆科学钻探主孔MH-2C取心钻井的第163回次,出现了一处比较短暂的氦气异常,最高值达到17×10-6(摩尔分数),比基础值高出200%,对应的迟到深度为4 906 m。气体异常与对应深度的岩心上的X形剪节理相对应。通过对所收集的三个气体样品的氦同位素分析,并对数据进行解析,得到的幔源氦在异常气体中的比例为2.68%~4.58%,说明该岩层中曾有少量幔源流体混入。由于异常持续时间较短,幔源氦比例较低,故推测本次氦异常由裂隙封存的流体所致,该段岩层处于俯冲陆壳的内部而非边缘。 相似文献
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As an achievement of the cooperation with Japan, TOA electromagnetic observation station was established with an 800 m borehole antenna and put into service in 1992 in Dali,Yunnan province,China. Li Wuxian et al. (2003) summarized main anomalous variation characters by analyzing 23 strong earthquakes with magnitudes more than 5. 0 recorded in the first ten years. This work mainly presents the electromagnetic changes prior to the last Mojiang M_S5. 9 earthquake on September 8,2018. First of all,the initial weak signals appeared in two ULF channels out of three observing channels (CH1 0. 01-0. 10 Hz,CH20. 1-1. 0 Hz and CH3 1-9 kHz) on May 30,2018 at Dali TOA electromagnetic station. The information recorded was characterized by wave-like changes with magnitudes of A_(CH1)≤0. 26 mV in CH1 and pulse-like impulses of A_(CH2)≤0. 6 mV in CH2,respectively.Then,abnormal information gradually enhanced either in magnitudes or in occurrence frequency. Pulse-like signals were full of lattices of recording paper for CH2 during June24-25 and slopped over the recording paper during June 28-29,with the magnitudes being greater than or equal to 10 mV. At the same time,the clear wave-like signals also appeared in CH1 with a maximum magnitude of ~ 0. 6 mV on June 28 and reached its climax. From then on,the information started to decrease from the end of July and only weak signals occasionally occurred till the end of August 2018,when obvious anomaly was recorded again in two ULF channels with maximum magnitudes of A_(CH1)~ 0. 2 mV and A_(CH2)~ 0. 3 mV respectively. Generally,these signals did not appear continuously but group by group and accumulated intensively only in ULF band instead of VLF band during the total period. 10 days later,the Mojiang M_S5. 9 earthquake occurred on September 8,2018,300 km away from Dali TOA station,and a coseismic response was also recorded at this time. Thus,these ULF electromagnetic abnormities could be probably attributed to the Mojiang event. 相似文献
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自1992年8月10日TOPEX/POSEIDON卫星发射成功以来,其海面高观测数据已累积近10年,产生了空间分辨率为0.5°×0.5°、时间分辨率为10天的二级数据产品和空间分辨率1°×1°、时间分辨率为5天的三级数据产品.本文利用1992年10月~2002年8月TOPEX卫星测高时间序列数据,通过数据处理和小波分析获取了1°×1°网格全球SSHA升高及周年和半周年波动变化信息,并分析了全球以及各个洋面区域的SSHA波动规律.分析结果表明,全球海平面在1992年10月~2002年8月升高了24.2 mm,其中南半球升高26.9 mm,北半球升高19.0 mm;全球SSHA周年变化项振幅的平均值是28.8 mm,半周年项振幅平均值为8.8 mm,周年项运动明显大于半周年项的运动.北半球SSHA周年变化项平均振幅为40.3 mm,南半球为21.1 mm,北半球SSHA半周年变化项平均振幅为10.9 mm,南半球为7.3 mm.同时还发现在太平洋和大西洋南北赤道暖流区的周年波动存在位相突变现象. 相似文献