13 results about "Gamma ray logging" patented technology

The invention discloses an intelligent and rapid stratigraphic dip angle pickup method and related equipment based on natural gamma-ray logging response in a horizontal well, and the method comprises the steps: building a natural gamma-ray logging response curve through simulating logging response characteristics of a horizontal well track entering a stratum at different angles, and analyzing the natural gamma-ray logging response curve; obtaining a first mathematical formula for estimating the first stratum interface included angle; grouping average and moving average processing is carried out on the natural gamma logging curve, and the stratum interface interval length corresponding to the natural gamma logging curve is determined; calculating a first formation interface included angle according to the formation interface interval length and the spherical detection radius through a first mathematical formula, and calculating a formation dip angle according to the first formation interface included angle and the hole drift angle. According to the embodiment of the invention, the method achieves the quick calculation and pickup of the dip angle under the condition of only depending on the natural gamma logging data, and is higher in calculation precision and calculation efficiency. The method can be widely applied to the technical field of stratum exploration or detection.

The application discloses a method for improving the imaging resolution of a while-drilling azimuthal gamma logging device based on regularization processing, and relates to the technical field of oilfield logging, and comprises the following steps: acquiring azimuthal response sensitivity data of the while-drilling azimuthal gamma logging device; collecting multi-sector gamma imaging data of the azimuthal gamma logging at each depth according to the azimuthal response sensitivity data; and performing regularization processing on the multi-sector gamma imaging data to obtain new gamma data close to the real radioactivity intensity distribution of a formation, so that the imaging resolution of the while-drilling azimuthal gamma logging is improved. The application solves the problems of low imaging resolution and large measurement error of the existing logging.

A method for gain correcting a gamma ray spectrum includes acquiring a gamma ray spectrum including gamma ray counts distributed into a plurality of energy channels, evaluating the acquired gamma ray spectrum to determine an energy of a calibration feature therein, comparing the energy of the calibration feature in the acquired spectrum to a standard spectral energy to determine a deviation between the energy of the calibration feature and the standard spectral energy, and adjusting the acquired spectrum so that the energy of the calibration feature is equal to the standard spectral energy to obtain a gain calibrated spectrum.

The application discloses a kind of based on Mitchell's cyclotron seismic interface dating method, comprising: obtaining natural gamma ray logging curve;Based on spectrum analysis, determine the energy of natural gamma ray logging curve containing Mitchell's cyclotron signal, quantity;Select the seismic interface with determined age and depth as time anchor point;From astronomical orbit model, select orbit parameter as target curve representing time domain;Based on time anchor point, determine the initial corresponding position of natural gamma ray logging curve and target curve, take it as starting point, according to the curve change of target curve, tune natural gamma ray logging curve to target curve, obtain time-depth conversion table and then determine astronomical age scale;Based on astronomical age scale, determine the age of the seismic interface to be determined.The application selects the seismic interface with absolute time as time anchor point, changes natural gamma ray logging curve from depth domain to time domain, obtains astronomical age scale, and can determine the age of seismic interface based on astronomical age scale.

The invention provides an organic matter content determination method and device, computer equipment and a storage medium, and belongs to the technical field of petroleum and natural gas extraction. The method comprises the steps that based on a resistivity logging curve and an interval transit time logging curve of a first well section, the initial organic matter content of the first well section at multiple sampling depths is determined, the resistivity logging curve comprises logarithmic resistivity of the multiple sampling depths, and the interval transit time logging curve comprises interval transit time of the multiple sampling depths; based on the natural potential logging curve of the first well section, the initial natural gamma logging curve of the first well section is reconstructed, a natural gamma logging curve of the first well section is obtained, and the shale content of the first well section at multiple sampling depths is determined; and for each sampling depth, correcting the initial organic matter content based on the shale content of the sampling depth to obtain the target organic matter content of the sampling depth. The method improves the accuracy of the organic matter content.

The application discloses a kind of based on astronomical cycle phase change area's full isochronous anchor point identification and anchoring method, and preliminary positioning is carried out according to its fixed space superimposed relationship with target isochronous anchor point by identifying the reference marker layer widely developed in area;Extract 405kyr long eccentricity period signal in preliminary positioning layer section natural gamma ray logging curve, identify and target isochronous anchor point fixed corresponding feature cycle phase section;Combining the feature lithology after phase change with logging curve response characteristics is comprehensively judged, and the accurate positioning of target isochronous anchor point phase change body is realized;Finally, the absolute astronomical age scale is established with the isochronous anchor point of accurate positioning as reference.The application breaks through the dependence of traditional method on the lithological characteristics of marker bed, realizes the accurate identification and absolute dating of phase change area isochronous anchor point, and provides reliable technical support for the construction of regional high-resolution isochronous stratigraphic framework.

The utility model discloses an underground orientation gamma logging instrument, and relates to the field of gamma logging instruments, the underground orientation gamma logging instrument comprises a centralizer assembly and a compression-resistant cylinder which are distributed from bottom to top, a shock absorber assembly, a gamma module assembly and an expansion device assembly which are distributed from bottom to top are arranged in the compression-resistant cylinder, and the shock absorber assembly is arranged above the centralizer assembly. The gamma module assembly comprises a gamma skeleton, a power supply module, a main control module, a gamma counter and a shielding body which is distributed in an eccentric state. According to the utility model, the expansion pressing plate in the expansion device can be gradually butted with the gamma skeleton by using the fixing screw, so that the expansion ring originally having a certain gap with the inner side wall of the compression-resistant cylinder can be propped against the inner side wall of the compression-resistant cylinder. The upper end of the gamma module assembly is kept in a fixed state by utilizing the tensioner assembly, so that the gamma module assembly can be effectively prevented from axially moving under the working conditions of high vibration and high impact, the stress load of a fixing screw at the lower end is reduced, the reliability of the whole instrument is improved, and the service life of the whole instrument is prolonged.

The anti-seismic natural gamma-ray logging instrument detection device comprises a gamma-ray detector damping body, the two ends of the gamma-ray detector damping body are fixedly connected with centralizing end plates correspondingly, and the centers of the gamma-ray detector damping body and the centralizing end plates are jointly provided with a threading pipe in a penetrating mode in the length direction; two sets of fixing units are arranged in the gamma detector damping body in the length direction at intervals, each set of fixing units comprises four cavity type fixing bins, and the four fixing bins are evenly distributed in the circumferential direction of the threading pipe. The four fixing bins of one set of fixing units and the four fixing bins of the other set of fixing units are arranged in a one-to-one staggered mode in the circumferential direction of the threading pipe, and each fixing bin is filled with a gamma detector. The invention further discloses an assembling method of the anti-seismic natural gamma-ray logging instrument detection device. The problem that in the prior art, due to the fact that a natural gamma-ray logging instrument is poor in anti-seismic performance, a gamma-ray detector is damaged and cannot work is solved.

The invention provides a natural gamma logging lithology real-time identification method based on the Bayesian theory. According to the natural gamma logging lithology real-time identification method based on the Bayesian theory, the adjacent well statistical law and geological rule priori knowledge can be fused, the lithology posterior probability is calculated in real time based on the Bayesian theory, the identification accuracy and the geological conformity under the complex stratum condition are remarkably improved, and the identification accuracy and the geological conformity are improved. And meanwhile, probabilistic output with clear statistical significance is provided, and the reliability and risk management and control capability of geosteering decision are enhanced.

Systems and methods for generating digital gamma-ray logs for target wells based on combined physics and machine learning model using real-time information (e.g., drilling parameters, survey data, gamma-ray logs, and so forth) obtained from offset wells analogous to the subject well in terms of gamma-ray readings. The systems and methods may provide solutions that may lower the cost of Measuring While Drilling (MWD) and / or Logging While Drilling (LWD) process and facilitate the users (e.g., drillers, geoscientists, and so forth) to make enhanced data driven decisions.

The application provides a data processing and application method for a while-drilling azimuthal gamma ray in sliding drilling, wherein step one is to perform azimuthal correction on the measured values of two detectors of the while-drilling azimuthal gamma ray according to the change of a tool face angle; step two is to perform fast forward calculation on the while-drilling azimuthal gamma ray in sliding drilling according to a prior formation model; and step three is to perform fast inversion calculation on the distance between a drill bit and a formation interface according to the change of actual while-drilling azimuthal gamma ray measured values. The drilling trajectory is adjusted in real time by comprehensively considering the forward calculation and inversion of the while-drilling azimuthal gamma ray. The algorithm in the application is mainly based on sliding directional drilling, the azimuthal correction method of the while-drilling azimuthal gamma ray logging is simple and easy to understand, the fast forward calculation algorithm of the while-drilling azimuthal gamma ray is an algorithm with a 45° window, which can guide the response of other azimuthal gamma ray logging with different window angles, and the analysis is performed by taking the detector as a target.

This invention provides a method and system for predicting gas content in coal-bearing formations through well logging and inversion. The method includes predicting coal seam gas content using sonic transit time, deep lateral resistivity, and natural gamma ray logging values, and establishing a gas content well logging prediction model through data regression analysis; validating the gas content well logging prediction model using measured coal seam gas content at sampling points; inverting the target exploration interval using seismic and borehole data to obtain a data volume of sonic transit time, deep lateral resistivity, and natural gamma ray logging values; extracting attribute values ​​from the above data volume to obtain attribute values ​​of the target layer plane; and substituting the attribute values ​​of the target layer plane into the validated gas content well logging prediction model to obtain the plane variation characteristics of gas content in the target exploration interval. Applying this invention overcomes the shortcomings of existing technologies, enabling accurate and effective prediction of gas content in coal-bearing formations with high speed and efficiency, allowing for large-scale application.

The invention discloses a rock-soil drilling device based on drill bit self-cleaning obstacle removal, and relates to the technical field of drilling devices, the rock-soil drilling device comprises a mobile drilling vehicle, and the outer surface of the mobile drilling vehicle is provided with a drilling assembly used for rock-soil drilling. According to the rock-soil drilling device based on self-cleaning and obstacle removing of the drill bit, in the bridge construction process, gamma ray logging is started, the property of rock-soil is detected, and through a three-dimensional discrimination function, when F is larger than 0.7, it is judged that a high-clay stratum is formed, spiral conveying is started, when F is smaller than 0.3, it is judged that a hard rock stratum is formed, slurry circulation is triggered, and meanwhile high-pressure gas cleaning is matched; therefore, the rock-soil drilling device based on self-cleaning and obstacle clearing of the drill bit can realize obstacle self-cleaning by adopting different modes when working on different surface layers, so that the working efficiency of the drilling device is improved, and the problem that the working efficiency of most rock-soil drilling devices is reduced due to single slag clearing mechanism in the prior art is solved.