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  • 后二64注稳定平刷不倍: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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  • 太坏了!傅欢遇“断子绝孙腿” 这动作红牌都不冤 2019-04-17
  • 市民工地发现并机智"抢回" 4件圆明园流散文物终"回家" 2019-04-17
  • 世界杯成中国企业营销升级大战场 2019-04-15
  • 中东部地区将有强降雨 京津冀等地有轻至中度霾 2019-04-11
  • 郑永年:新时代的清醒判断 2019-04-11
  • 让协商民主优势得以充分发挥 2019-04-10
  • 网友给太原市市长留言获回复 共计11条 2019-04-09
  • 尧都区车站街建设社区老党员高德宏同志手抄“党章”庆党生 2019-04-09
  • 正心正念 爱国爱教 佛界楷模 2019-04-02
  • 防治土地荒漠化 新疆保护生态兼顾农民增收 2019-04-02
  • 许倬云作序《现代的历程》:现代人的天问 2019-03-31
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  • 2008年全球金融危机之后,为什么金融危机发源地的美国,欧债危机重灾区的欧洲各国股市连续7年走牛,屡创历史新高,唯经济最好的中国股市却连续7年熊冠全球?去年中国 2018-11-17
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