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    BOREHOLE ELECTRIC FIELD SURVEY WITH IMPROVED DISCRIMINATION OF SUBSURFACE FEATURES
    2.
    发明公开
    BOREHOLE ELECTRIC FIELD SURVEY WITH IMPROVED DISCRIMINATION OF SUBSURFACE FEATURES 审中-公开
    具有改良表面性质的区别WELL-POWER实地调查

    公开(公告)号：EP3039461A2

    公开(公告)日：2016-07-06

    申请号：EP14792620.8

    申请日：2014-08-04

    申请人： Saudi Arabian Oil Company ,  Groundmetrics, Inc.

    发明人： MARSALA, Alberto ,  HIBBS, Andrew Dennis

    IPC分类号： G01V3/24

    摘要： Errors produced in a borehole to surface electromagnetic (BSEM) survey by near surface electrical anomalies on the estimates of formation properties are reduced. The effects of variations in subsurface electrical resistivity near the surface are separated from electrical resistivity changes at locations in the formations of interest far from the measurement region. A survey system includes one or more electrodes to inject electrical current at formation depth within a borehole, one or more counter electrodes which collect such current on the surface of the earth, and one or more electrodes to inject current on the surface. A transmitter is selectively connectable to different sets of the electrodes to cause a current to flow between the selected electrode sets. The resultant fields from the current flow are sensed and processed. The effects of near surface anomalies are detectable in the data and removable from the survey data of interest regarding the formations. The survey data more accurately indicates formation features or properties of interest.

    MAPPING RESISTIVITY DISTRIBUTION WITHIN THE EARTH
    3.
    发明公开
    MAPPING RESISTIVITY DISTRIBUTION WITHIN THE EARTH 审中-公开
    ABBILDUNG DER WIDERSTANDSVERTEILUNG IM ERDINNERN

    公开(公告)号：EP3039460A2

    公开(公告)日：2016-07-06

    申请号：EP14790386.8

    申请日：2014-08-04

    申请人： Saudi Arabian Oil Company ,  Groundmetrics, Inc.

    发明人： MARSALA, Alberto ,  HIBBS, Andrew Dennis ,  PETROV, Todor

    IPC分类号： G01V3/18 ,  G01V3/38 ,  G01V3/30

    CPC分类号： G01V3/08 ,  E21B47/00 ,  G01V3/18 ,  G01V3/30 ,  G01V3/38

    摘要： Resistivity in subsurface earth at locations kilometers away from wells in the reservoirs is mapped and monitored. An electromagnetic source with an electrode is deployed a borehole in the reservoir, and a group of sensors at counter electrodes is deployed at a number of other locations radially spaced at some distance from the well. The source transmits a current which flows to the counter electrodes causing an electromagnetic field which is sensed at the sensors. The source is activated at different depths in the well and ratios of the electromagnetic field sensed with the source at different depths used to obtain data to map the resistivity. The sensors are capable of sensing electromagnetic fields along two orthogonal axes, and the measurements at a sensor along these axes used to reduce undesirable effects of noise and other factors on the data measurements.

    摘要翻译： 绘制并监测了水库以外距离井口公里的地下地球的电阻率。 具有电极的电磁源在储存器中展开钻孔，并且在对置电极处的一组传感器在与井的一定距离径向间隔开的多个其它位置处展开。 源发送流向对电极的电流，导致在传感器处感测到的电磁场。 源在阱中的不同深度处被激活，并且在用于获得数据以映射电阻率的不同深度处感测的电磁场的比率。 这些传感器能够沿着两个正交轴检测电磁场，并且沿着这些轴的传感器的测量值用于减少噪声和其他因素对数据测量的不良影响。