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公开(公告)号：US09753176B2
公开(公告)日：2017-09-05
申请号：US13767721
申请日：2013-02-14
CPC分类号： G01V3/32 , E21B47/00 , G01V3/26 , Y02A90/344
摘要： Adsorbed gas in a formation may be estimated. Nuclear magnetic resonance (NMR) data for a subsurface geological formation is obtained, and at least a portion of the NMR data is corrected to produce corrected NMR data. A NMR-based estimate of formation porosity is determined using the corrected NMR data. Dielectric permittivity data for the subsurface geological formation is obtained, and a dielectric permittivity-based estimate of the formation water-filled porosity is determined using the dielectric permittivity data. A gas volume is determined using the determined NMR-based estimate of the formation porosity and the determined dielectric permittivity-based estimate of the formation water-filled porosity. The gas volume may be determined by subtracting the determined dielectric permittivity-based estimate of the formation water-filled porosity from the determined NMR-based estimate of the formation porosity. The gas volume per unit volume of the formation may be determined using an equation of state.
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公开(公告)号：US09746576B2
公开(公告)日：2017-08-29
申请号：US14287834
申请日：2014-05-27
申请人： Segun A. Jebutu , Weidong Li
发明人： Segun A. Jebutu , Weidong Li
摘要： A method of estimating a wettability characteristic of a formation includes: disposing a magnetic resonance (MR) measurement apparatus in a borehole; generating a low gradient static magnetic field and an oscillating magnetic field in a region of the formation; detecting a MR signal generated in the region; calculating relaxation parameters for at least one fluid in the region; and estimating the wettability characteristic of the region based on the relaxation parameters.
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93.发明授权公开(公告)号：US09733383B2
公开(公告)日：2017-08-15
申请号：US14109497
申请日：2013-12-17
CPC分类号： G01V3/32 , E21B49/088 , G01N24/081 , G01V11/00
摘要： Methods and apparatuses are provided for analyzing a composition of a hydrocarbon-containing fluid. The methods include using a nuclear magnetic resonance (NMR) tool to conduct NMR measurements on the hydrocarbon-containing fluid to obtain NMR data. A non-NMR tool, such as an optical tool, is used to conduct additional measurements and to obtain non-NMR data on the fluid. The methods further include determining an indication of the composition of the fluid by using the NMR data and normalizing the indication of the composition of the fluid using the non-NMR data.
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公开(公告)号：US09720128B2
公开(公告)日：2017-08-01
申请号：US13768965
申请日：2013-02-15
CPC分类号： G01V3/32 , G01N24/081 , G01R33/448 , G01R33/4633
摘要： An NMR method and apparatus for analyzing a sample of interest applies a static magnetic field together with RF pulses of oscillating magnetic field across a sample volume that encompasses the sample of interest. The RF pulses are defined by a pulse sequence that includes a plurality of measurement segments configured to characterize a plurality of relaxation parameters related to relaxation of nuclear magnetization of the sample of interest. Signals induced by the RF pulses are detected in order to derive the relaxation parameters. The measurement segments of the pulse sequence include at least one first-type measurement segment configured to characterize relaxation of spin-lattice interaction between nuclei of the sample of interest in a rotating frame (T1ρ) at a predefined frequency. The T1ρ parameter can be measured in conjunction with the measurement of other relaxation and/or diffusion parameters as part of multidimensional NMR experiments.
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公开(公告)号：US20170212064A1
公开(公告)日：2017-07-27
申请号：US15500499
申请日：2015-07-29
CPC分类号： G01N24/081 , E21B43/16 , E21B49/00 , G01N33/241 , G01N33/246 , G01V1/50 , G01V3/32 , G01V9/02 , G01V2210/6244
摘要： Methods, systems, and computer-readable media for assessing porosity and water saturation cutoff values for hydrocarbon volume estimation are described. The techniques can include determining a plurality of water saturation and porosity value pairs for locations regularly-spaced along at least one borehole. The techniques can further include plotting the plurality of water satoration and porosity value pairs on a graph and representing a plurality of percentiles of the estimated maximal hydrocarbon volume on the graph. The techniques can also include causing the graph to be displayed to a user, such that the user can visually observe a combined sensitivity to porosity and water saturation cutoffs values. The user can take various actions based on the display.
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公开(公告)号：US09715032B2
公开(公告)日：2017-07-25
申请号：US13952999
申请日：2013-07-29
发明人： Yiqiao Song , Michael Wilt , Pabitra Sen
IPC分类号： G01N24/08 , G01R33/3415 , G01R33/44 , G01V3/32 , G01R33/36
CPC分类号： G01V3/32 , G01N24/08 , G01N24/081 , G01N24/085 , G01R33/3415 , G01R33/3621 , G01R33/445
摘要： A nuclear magnetic resonance (NMR) system that uses a feedback induction coil to detect NMR signals generated within a substance is described herein. In one embodiment, the NMR system uses the Earth's magnetic field in conjunction with a transmitter coil that applies NMR sequences to a formation. The NMR sequences generate a weak NMR signal within the formation due to the weakness of the Earth's magnetic field. This weak NMR signal is detected using the feedback induction coil.
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公开(公告)号：US20170205528A1
公开(公告)日：2017-07-20
申请号：US15479318
申请日：2017-04-05
发明人： Timothy Andrew John Hopper , David G Cory , Julius Kusuma , Yi-Qiao Song , Martin D. Hurlimann , Martin E. Poitzsch
CPC分类号： G01V3/32 , G01N24/081 , G01R33/3607 , G01R33/3621
摘要： Methods and systems are provided for tools having non-resonant circuits for analyzing a formation and/or a sample. For example, nuclear magnetic resonance and resistivity tools can make use of a non-resonant excitation coil and/or a detection coil. These coils can achieve desired frequencies by the use of switches, thereby removing the requirement of tuning circuits that are typical in conventional tools.
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公开(公告)号：US09678182B2
公开(公告)日：2017-06-13
申请号：US14213887
申请日：2014-03-14
发明人： Soumyajit Mandal , Shin Utsuzawa , Yi-Qiao Song
CPC分类号： G01R33/3621 , G01N24/081 , G01R33/3614 , G01V3/32
摘要： A magnetic resonance (MR) receiver is described herein. The MR receiver can be used to process nuclear magnetic resonance (NMR) signals. The MR receiver includes a transformer that amplifies the MR signals and a preamplifier that receives the MR signals from the transformer. The preamplifier can include a transimpedance amplifier circuit with an input stage that includes a field effect transistor.
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99.发明申请公开(公告)号：US20170123104A1
公开(公告)日：2017-05-04
申请号：US14962201
申请日：2015-12-08
发明人： Jean-Marc Donadille , Lalitha Venkataramanan , Vasileios-Marios Gkortsas , Stacy Lynn Reeder Blanco
CPC分类号： G01N15/088 , E21B49/00 , G01N27/221 , G01V3/06 , G01V3/32
摘要： Methods are provided for determining values of a pore cementation exponent m and/or a saturation exponent n for locations in a formation having similar petrophysical properties. Formation porosity, formation water saturation, and an apparent cementation exponent mn are obtained for the locations and their values are utilized to find the exponents. In one embodiment, the apparent cementation exponent and the formation water saturation are obtained from a dielectric logging tool.
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100.发明申请公开(公告)号：US20170082771A1
公开(公告)日：2017-03-23
申请号：US15258703
申请日：2016-09-07
发明人： LIZHI XIAO , WEI LIU , GUANGZHI LIAO , XIN LI
CPC分类号： G01V3/32 , E21B47/00 , G01R33/34007 , G01R33/3415 , G01R33/3614 , G01R33/3808
摘要： The present invention provides a three dimensional nuclear magnetic resonance logging instrument based on multiple antenna excitation, including: a probe, an excitation transmitter and a bearing component; the probe includes magnet and multiple antennas arranged at outer side of the magnet, and the multiple antenna individually and independently provide feed; a holding cavity is provided in the bearing component, and the excitation transmitter is fixed in the holding cavity; and the excitation transmitter includes a transmitter framework and an excitation circuit; the transmitter framework and the bearing component are fixedly connected; and the excitation circuit is fixed on the transmitter framework, and is electrically connected with each of the multiple antennas for feeding the multiple antennas.
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