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    Systems and Methods for Determining Dielectric Constant or Resistivity from Electromagnetic Propagation Measurement Using Contraction Mapping
    1.
    发明申请
    Systems and Methods for Determining Dielectric Constant or Resistivity from Electromagnetic Propagation Measurement Using Contraction Mapping 审中-公开
    使用收缩映射从电磁传播测量确定介电常数或电阻率的系统和方法

    公开(公告)号：US20160170069A1

    公开(公告)日：2016-06-16

    申请号：US14957531

    申请日：2015-12-02

    Applicant: Schlumberger Technology Corporation

    Inventor： Gong Li Wang ,  Tianxia Zhao ,  Keli Sun ,  Aria Abubakar

    IPC: G01V3/30 ,  E21B49/00 ,  G01V3/38

    CPC classification number: E21B49/00 ,  G01V3/28 ,  G01V3/38

    Abstract: Identifying the dielectric constant and/or the electrical resistivity of part of a geological formation may reveal useful characteristics of the geological formation. This disclosure provides methods, systems, and machine-readable media to determine dielectric constant or electrical resistivity, or both, using contraction mapping. Specifically, contraction mapping may be used with a function of wavenumber k to iteratively solve for values of dielectric constant and electrical resistivity until convergence is achieved. This may allow for convergence to a solution without computing partial derivatives and/or with fewer iterations than previous techniques.

    Abstract translation: 识别部分地质构造的介电常数和/或电阻率可能揭示出地质构造的有用特征。 本公开提供了使用收缩映射来确定介电常数或电阻率或两者的方法，系统和机器可读介质。 具体来说，收缩映射可以与波数k的函数一起使用，以迭代地求解介电常数和电阻率的值，直到达到收敛。 这可能允许收敛到解决方案，而不需要计算偏导数和/或比以前的技术更少的迭代。

    Multiaxial Well Logging Instrument Response in Dipping and Crossbedded Formations
    2.
    发明申请
    Multiaxial Well Logging Instrument Response in Dipping and Crossbedded Formations 审中-公开
    多轴测井仪器在浸渍和交叉组合中的响应

    公开(公告)号：US20150276966A1

    公开(公告)日：2015-10-01

    申请号：US14669683

    申请日：2015-03-26

    Applicant: Schlumberger Technology Corporation

    Inventor： Gong Li Wang ,  Thomas Barber ,  Peter Wu ,  David F. Allen ,  Aria Abubakar

    IPC: G01V3/20 ,  G01V99/00 ,  G01V3/38

    CPC classification number: G01V3/38 ,  G01V3/28

    Abstract: A method for determining resistivity of subsurface formations includes generating an initial model of the formations from multiaxial electromagnetic transimpedance measurements, the model comprising values of vertical resistivity, horizontal resistivity, crossbed dip, crossbed azimuth, and bedding dip and azimuth. Expected measurements generated from the initial model measurements are decomposed into ordinary and extraordinary components. The actual tool measurements are compared to the summation of the expected decomposed measurement components. The initial model is adjusted, the expected decomposed components are recalculated and the foregoing are repeated until the difference between the actual tool measurements and the summation of the expected decomposed components falls below a selected threshold.

    Abstract translation: 用于确定地下地层电阻率的方法包括从多轴电磁互阻测量产生地层的初始模型，该模型包括垂直电阻率，水平电阻率，交叉倾角，交叉方位角以及铺垫倾角和方位角的值。 从初始模型测量产生的预期测量值被分解为普通和非凡的组件。 将实际的刀具测量与预期分解的测量组件的总和进行比较。 调整初始模型，重新计算预期的分解组分，并重复上述内容，直到实际工具测量值与预期分解组分的总和之间的差值低于选定的阈值。

    Determining Dielectric Constant and Resistivity with Induction Measurement
    4.
    发明申请
    Determining Dielectric Constant and Resistivity with Induction Measurement 审中-公开

    公开(公告)号：US20190353819A1

    公开(公告)日：2019-11-21

    申请号：US16396324

    申请日：2019-04-26

    Applicant: Schlumberger Technology Corporation

    Inventor： Gong Li Wang ,  John Rasmus ,  Dean Homan

    IPC: G01V3/28

    Abstract: The highly valuable properties of resistivity and dielectric constant of a geological formation may be determined using an induction measurement, even for a geological formation with bed boundary or dipping effects, using a one-dimensional (1D) formation model. Induction measurements may be obtained in a wellbore through the geological formation using one or more downhole tools. One or more processors may be used to perform an inversion to estimate resistivity and dielectric constant values of the geological formation. The inversion may be performed using the induction measurements and a one-dimensional model that includes a number of geological layers.

    Dielectric-based geosteering
    5.
    发明授权
    Dielectric-based geosteering 有权

    公开(公告)号：US12163413B1

    公开(公告)日：2024-12-10

    申请号：US18443386

    申请日：2024-02-16

    Applicant: Schlumberger Technology Corporation

    Inventor： John Rasmus ,  Dean Homan ,  Gong Li Wang

    IPC: E21B44/00 ,  E21B7/04 ,  E21B49/00

    Abstract: A method can include receiving dielectric data from a downhole dielectric tool of a drillstring disposed in a borehole in a target material that includes a target material boundary between the target material and one or more other materials; generating a geosteering command, based at least in part on the dielectric data, that calls for orienting a drill bit of the drillstring with respect to the target material boundary; and issuing the geosteering command to a geosteering actuator of the drillstring.

    Extended 1D Inversion Of Electromagnetic Measurements For Formation Evaluation
    8.
    发明申请
    Extended 1D Inversion Of Electromagnetic Measurements For Formation Evaluation 审中-公开
    电磁测量的扩展1D反演用于形成评估

    公开(公告)号：US20160047934A1

    公开(公告)日：2016-02-18

    申请号：US14782149

    申请日：2014-04-02

    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION

    Inventor： Gong Li Wang ,  Thomas D. Barber

    IPC: G01V3/28 ,  G01V3/10 ,  G01V3/38

    CPC classification number: G01V3/28 ,  G01V3/10 ,  G01V3/104 ,  G01V3/18 ,  G01V3/38

    Abstract: A method to determine at least one formation property of a subterranean formation includes providing a downhole electromagnetic logging tool having at least one transmitter array and one receiver array and acquiring measurements in the formation using the transmitter and receiver arrays of the downhole electromagnetic logging tool. The method further includes performing a first inversion in response to the measurements, wherein at least one of dip or dip azimuth are assumed constant in an inversion zone within the formation to obtain an inverted formation model that comprises at least one of horizontal resistivity (Rh), vertical resistivity (Rv), dip, and dip azimuth. The method includes determining an n-th order partial derivative matrix of at least one of dip or dip azimuth, wherein n is greater than or equal to 1. The method includes performing a second inversion using the determined n-th order partial derivative matrix, wherein at least one of dip and dip azimuth are allowed to vary in the inversion zone, to obtain an updated formation model. The method includes determining the at least one formation property of the formation using the up-dated formation model.

    Abstract translation: 确定地下地层的至少一个地层特性的方法包括提供具有至少一个发射器阵列和一个接收器阵列的井下电磁测井工具，并使用井下电磁测井工具的发射器和接收器阵列获取地层中的测量结果。 该方法还包括响应于测量执行第一反演，其中在地层内的反转区域中假定浸入或倾角方位角中的至少一个是恒定的，以获得反向地层模型，其包括水平电阻率（Rh） ，垂直电阻率（Rv），倾角和倾角方位。 该方法包括确定浸入或倾角方位中的至少一个的n阶偏导数矩阵，其中n大于或等于1.该方法包括使用所确定的n阶偏导数矩阵来执行第二反演， 其中允许在反转区域中倾斜和倾斜方位角中的至少一个变化，以获得更新的形成模型。 该方法包括使用更新的地层模型确定地层的至少一个地层性质。

    Methods for predicting and monitoring downhole salinity variations
    9.
    发明授权
    Methods for predicting and monitoring downhole salinity variations 有权

    公开(公告)号：US12259517B2

    公开(公告)日：2025-03-25

    申请号：US18717453

    申请日：2022-05-20

    Applicant: Schlumberger Technology Corporation ,  SAUDI ARABIAN OIL COMPANY

    Inventor： Gong Li Wang ,  Wael Abdallah ,  Shouxiang Ma ,  Sherif Ghadiry

    IPC: G01V3/38 ,  G01V3/18 ,  G06N20/00

    Abstract: Methods and systems are provided for characterizing connate water salinity and resistivity of a subsurface formation. Well log data including resistivity and spontaneous potential (SP) log data are measured by at least one downhole tool disposed within a borehole. The resistivity and SP log data are inverted to determine a resistivity model and an SP model, which are used to determine connate water resistivity. The connate water resistivity is used to determine connate water salinity. The connate water salinity derived from the inversion of resistivity log data and SP log data (or derived from a trained ML system supplied with such log data) can be used as a baseline measure of connate water salinity, and this baseline measure can be evaluated together with the connate water salinity estimates derived from pulsed neutron tool measurements over time-lapsed periods of production to monitor variation in connate water salinity due to production.

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