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  • 时时彩投万位,稳赚方法:Resistivity

    Direct-Current (DC) Resistivity

    后一万能码 2期内中 www.qgqx.net DC resistivity methods can reliably detect resistivity contrasts from the near-surface to depths of 500-600 m. The resistivity of soils and rock is measured as a function of depth and of position. Porosity, permeability, ionic content of the pore fluids, clay content and facies are characterized by such measurements. In particular, we use electrical resistivity methods to highlight facies and thus to estimate velocity variations in the shallow part of the subsurface.

    Velocity from Resistivity

    In a shallow water environment, where refraction (LVL) and uphole surveys costs are prohibitive, the near-surface velocity model can be derived using a towed resistivity streamer survey. The near-surface velocity model obtained by converting the resistivities into velocities can then be used to compute the static corrections.

    Electromagnetic methods

    Time-domain and frequency-domain electromagnetic techniques can reliably detect conductivity contrasts in the ground from the near-surface to depths of greater than 500 m. They are widely used for near-surface imaging, mineral exploration, water exploration, geological mapping, delineation of subsurface contamination plumes and salinity mapping.

    EM - resistivity section

    Magnetotellurics

    With advances in instrumentation, processing and modeling, MT has become a very important tool in deep subsurface reconnaissance. Magnetotelluric services aim to image the Earth’s subsurface by measuring natural variations in electrical and magnetic fields at the Earth’s surface, ranging from very shallow depths by recording higher frequencies(Audiomagnetotelluric or AMT), down to depths of 10,000 meters by recording low frequencies (Magnetotelluric or MT). Under conductive overburden, MT provides unique penetration. Our AMT and MT services include high-quality data acquisition, processing, inversion, modeling and interpretation. Complementary to seismic, MT surveys are used for: geologic mapping, in particular mapping sub-basalt structures, foothills, thrust and fold belts; frontier play exploration; reservoir characterization and monitoring; mapping of various base metals, nickel, Cu-porphyry (+/- Au,Mo), VMS, IOCG, kimberlites diamond, graphite; groundwater exploration.

    Resistivity and Induced Polarization

    The Induced Polarization (IP) method reliably detects disseminated sulphides which are often associated with economic base metal and gold deposits. This method, along with resistivity, is also used for geological mapping and groundwater studies. CGG uses industry standard equipment to acquire high-quality time-domain IP and resistivity data. Transmitters ranging from portable battery-powered models to high-powered systems are used to ensure the equipment is best suited to the application, the location and to optimize transmitter current and power.

    Onshore (General Geophysics)

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  • 宝贝是地名,你能想到这么浪漫的地名在哪儿吗? 2019-11-03
  • 岳云鹏跟陈赫学打嗝 网友调侃:你教他说相声啊 2019-11-03
  • 高息债台倒塌致败局 资本猎手颜静刚丢了宏达矿业 2019-11-02
  • 成都寻旧文章中国国家地理网 2019-11-02
  • 第九届全球健康促进大会 2019-11-02
  • 孟铎合同到期即将离队 离加盟广东宏远只差官宣 2019-10-31
  • 香港推进“青年宿舍计划”(观香港) 2019-10-25
  • 马克思主义哲学是帮助我们看清世界的一双“慧眼” 2019-10-24
  • 望远镜的眼睛有多大?这个参数很关键 2019-10-24
  • 重磅!6月20日起 湖南启动省级环保督察 2019-10-19
  • 西安一男子伙同他人制假 将工业醋酸变身食用醋 2019-10-19
  • 合肥庐阳18小区将现“十八变” 4254户居民将受益 2019-10-16
  • 俄罗斯世界杯F组:球迷风采 2019-10-12
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