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公开(公告)号：US20170298727A1
公开(公告)日：2017-10-19
申请号：US15628911
申请日：2017-06-21
摘要： A method and a resistivity image logging tool connected or connectable to one or more processing devices process geological log data to construct missing information from destroyed or occluded parts using cues from observed data. The geological log data signals can be generated through use of the logging tool having one or more electrodes interacting with a formation intersected by a borehole. The processing involves the steps of: in respect of one or more data dimensions associated with missing values in a log data set, decomposing the signal into a plurality of morphological components; and morphologically reconstructing the signal such that missing values are estimated.
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公开(公告)号：US09704263B2
公开(公告)日：2017-07-11
申请号：US14873715
申请日：2015-10-02
CPC分类号： G06T7/13 , G01V1/40 , G01V1/42 , G01V3/20 , G01V3/24 , G01V3/38 , G01V11/00 , G01V2210/6169 , G06T2207/10132 , G06T2207/20056
摘要： A method of detecting an edge of a geological characteristic in a borehole comprises, in respect of an image log of a length of a borehole, carrying out the steps of a gradient-based edge detection method, a phase congruence-based edge detection method or a combination of such methods as preliminary, pre-processing stages. Subsequent steps of the method may include operating a relatively computationally simple process to identify sinusoids among detected edge features; and a relatively computationally complex process for parameterizing the thus-identified sinusoids.
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公开(公告)号：US10255473B2
公开(公告)日：2019-04-09
申请号：US15471656
申请日：2017-03-28
摘要： A method and a resistivity image logging tool connected or connectable to one or more processing devices process geological log data to construct missing information from destroyed or occluded parts using cues from observed data. The geological log data signals can be generated through use of the logging tool having one or more electrodes interacting with a formation intersected by a borehole. The processing involves the steps of: in respect of one or more data dimensions associated with missing values in a log data set, decomposing the signal into a plurality of morphological components; and morphologically reconstructing the signal such that missing values are estimated.
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公开(公告)号：US20170103554A1
公开(公告)日：2017-04-13
申请号：US15386353
申请日：2016-12-21
IPC分类号： G06T11/20
CPC分类号： G06T11/206 , E21B47/01 , E21B47/102 , E21B49/00 , G01V3/24 , G01V3/38 , G03B37/005 , G06T11/00 , G06T11/003 , G06T15/80
摘要： A method of processing borehole log data to create one or more image logs involve modelling the log data as components of an image in the form i(x, y)=l(x, y)×r(x, y) (1), in which i(x, y) is an image representative of the log data, l(x, y) denotes an illumination value of the image at two-dimensional spatial co-ordinates x, y, and r(x, y) denotes a surface reflectance value at the co-ordinates x, y. Equation (1) is transformed to a logarithmic domain, and a Fourier transform is obtained of the resulting logarithmic domain expression to obtain a Fourier domain expression. The Fourier domain expression is high-pass filtered, and an inverse Fourier transform is obtained of the resulting filtered Fourier domain expression. An exponential operation is performed on the result of inverse Fourier transform to obtain a filtered image model expression. Values of the filtered image model expression are mapped to respective color values across the range of the filtered image model expression values. The mapped color values can then be displayed, printed, saved and/or transmitted as one or more image logs.
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公开(公告)号：US20160027186A1
公开(公告)日：2016-01-28
申请号：US14873715
申请日：2015-10-02
CPC分类号： G06T7/13 , G01V1/40 , G01V1/42 , G01V3/20 , G01V3/24 , G01V3/38 , G01V11/00 , G01V2210/6169 , G06T2207/10132 , G06T2207/20056
摘要： A method of detecting an edge of a geological characteristic in a borehole comprises, in respect of an image log of a length of a borehole, carrying out the steps of a gradient-based edge detection method, a phase congruence-based edge detection method or a combination of such methods as preliminary, pre-processing stages. Subsequent steps of the method may include operating a relatively computationally simple process to identify sinusoids among detected edge features; and a relatively computationally complex process for parameterizing the thus-identified sinusoids.
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公开(公告)号：US11353615B2
公开(公告)日：2022-06-07
申请号：US15861807
申请日：2018-01-04
摘要： In acoustic well logging, for each inversion depths of a well at which logging of data occurs, acoustic log signals representative of waveforms received at acoustic receivers are processed in a frequency domain to derive field dispersion curve(s). A neural net is operated to generate formation shear slowness value(s) from the curve(s), and resulting signal(s) indicative of shear slowness values are saved, transmitted, plotted, printed or processed. An apparatus for carrying out the method includes a logging tool having at least one activatable acoustic wave source; spaced and acoustically isolated therefrom in the logging tool an array of acoustic detectors that on the detection of acoustic wave energy generate electrical or electronic log signal(s) characteristic of acoustic energy waves detected by the acoustic detector(s); and at least one processing device associated with or forming part of the logging tool for processing the log signal(s).
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公开(公告)号：US10074202B2
公开(公告)日：2018-09-11
申请号：US15386353
申请日：2016-12-21
CPC分类号： G06T11/206 , E21B47/01 , E21B47/102 , E21B49/00 , G01V3/24 , G01V3/38 , G03B37/005 , G06T11/00 , G06T11/003 , G06T15/80
摘要： A method of processing borehole log data to create one or more image logs involve modelling the log data as components of an image in the form i(x, y)=l(x, y)×r(x, y) (1), in which i(x, y) is an image representative of the log data, l(x, y) denotes an illumination value of the image at two-dimensional spatial co-ordinates x, y, and r(x, y) denotes a surface reflectance value at the co-ordinates x, y. Equation (1) is transformed to a logarithmic domain, and a Fourier transform is obtained of the resulting logarithmic domain expression to obtain a Fourier domain expression. The Fourier domain expression is high-pass filtered, and an inverse Fourier transform is obtained of the resulting filtered Fourier domain expression. An exponential operation is performed on the result of inverse Fourier transform to obtain a filtered image model expression. Values of the filtered image model expression are mapped to respective color values across the range of the filtered image model expression values. The mapped color values can then be displayed, printed, saved and/or transmitted as one or more image logs.
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公开(公告)号：US20180196156A1
公开(公告)日：2018-07-12
申请号：US15861807
申请日：2018-01-04
CPC分类号： G01V1/48 , G01V1/305 , G01V1/46 , G01V2210/32 , G01V2210/582
摘要： In acoustic well logging, for each inversion depths of a well at which logging of data occurs, acoustic log signals representative of waveforms received at acoustic receivers are processed in a frequency domain to derive field dispersion curve(s). A neural net is operated to generate formation shear slowness value(s) from the curve(s), and resulting signal(s) indicative of shear slowness values are saved, transmitted, plotted, printed or processed. An apparatus for carrying out the method includes a logging tool having at least one activatable acoustic wave source; spaced and acoustically isolated therefrom in the logging tool an array of acoustic detectors that on the detection of acoustic wave energy generate electrical or electronic log signal(s) characteristic of acoustic energy waves detected by the acoustic detector(s); and at least one processing device associated with or forming part of the logging tool for processing the log signal(s).
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公开(公告)号：US20140365133A1
公开(公告)日：2014-12-11
申请号：US14290187
申请日：2014-05-29
IPC分类号： G01V1/28
CPC分类号： G01V1/50
摘要： Disclosed herein is method of computing formation attributes from acoustic measurements in a borehole. The acoustic measurements can be made by operating an acoustic source at multiple frequencies to excite the formation and operating receivers at multiple, longitudinally spaced receiver stations to receive acoustic energy from the formation. The method can include: deriving phase data from the spectrum of received acoustic signals; unwrapping phase information of the phase spectrum data; determining two or more values of difference of phase between acoustic signals at each of a range of frequencies each based on a single generated signal received at two or more pairs of adjacent said receiver stations; generating a value of slope of phase difference values; and in any case of slope ambiguity, unwrapping phase difference information and deriving a dominant slope, at each frequency, from which slowness of the acoustic signal in the formation can be derived.
摘要翻译： 这里公开的是在钻孔中从声学测量计算地层属性的方法。 可以通过在多个频率处操作声源来激发声学测量，以激励在多个纵向间隔的接收站处的接收机的形成和操作以从地层接收声能。 该方法可以包括：从接收的声信号的频谱中导出相位数据; 展开相位谱数据的相位信息; 确定每个频率范围中的每个声频信号之间的相位差的两个或更多个值，其基于在两个或更多对相邻的所述接收机站处接收的单个产生的信号; 产生相位差斜率值; 并且在任何情况下的斜率模糊度，在每个频率处展开相位差信息并导出主斜率，从中可以导出地层中的声信号的慢度。
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公开(公告)号：US11714209B2
公开(公告)日：2023-08-01
申请号：US16839842
申请日：2020-04-03
发明人： Said Assous
CPC分类号： G01V1/50 , E21B47/14 , G01V1/307 , G01V2210/47 , G01V2210/63
摘要： In a method to transform logs, an acoustic logging tool inserted into a borehole includes a source and an array of receiver stations. Each station includes a receiver spaced along the tool from the source by successively greater distances. In the method, the source emits energy (I) to cause the propagation towards the stations of plural signals exhibiting paths characteristic of first and second respective modes and (II) to stimulate a receiver of each station to generate an output signal per station that indicates the signal packets and represents the modes in combination with one another. In the method, the output signals are transformed into transformed signals containing phase/amplitude information of each mode. The phase/amplitude are linked by an operator to the slowness and attenuation of the mode and the transmitter-receiver distance of the station. The phase/amplitude are used to extract slowness and attenuation information for each mode.
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