19 results about "Density logging" patented technology

The application discloses a method, device and equipment for identifying sweet spots of shale oil in a salinized lake basin. The method comprises the following steps: firstly, determining a rock structure factor of a stratum based on a natural gamma curve, volume density logging data and skeleton density logging data of the stratum, so as to determine the lithology of the stratum and identify reservoir rock layers in the stratum based on the rock structure factor; then, determining a lamination index of the rock in the stratum based on electrical imaging logging data, so as to identify source rock layers in the stratum based on the lamination index; and finally, identifying a sweet spot development section of the shale oil in the salinized lake basin based on the reservoir rock layers in the stratum and the source rock layers in the stratum. The method can quickly identify the sweet spot development section of the shale oil in the target area, and provides a basis for later oil and gas development.

The application discloses a qualitative identification method for thin-layer mudstone interlayer in volcanic rock, which comprises the following steps: firstly, determining a mudstone section stably existing in the whole area through core observation and logging data, and taking the mudstone section as a standard section; secondly, selecting three curves (a neutron logging curve, an acoustic time difference logging curve and a density logging curve) responding best to the mudstone, standardizing logging curves of the standard section and the volcanic rock section in the whole area, and determining the peak value and the distribution range of the logging curves; selecting sample points with the best effect in the mudstone section and the volcanic rock section, taking the acoustic time difference logging curve as the horizontal coordinate, and taking the neutron logging curve and the density logging curve as the vertical coordinate respectively to establish a logging interpretation chart, qualitatively determining the identification standard of the mudstone and the igneous rock, and predicting the mudstone interlayer in the volcanic rock in a single well according to the chart. The application solves the problem of qualitative identification of the thin-layer mudstone interlayer in the volcanic rock, and provides reliable technical support for the analysis of the remaining oil potential of the igneous rock.

The application discloses a porosity calculation method and system for complex reservoirs, which comprises the following steps: selecting a marker layer, and performing preliminary correction on original neutron and density logging curves of a target layer by using deviation analysis according to skeleton neutron values and skeleton density values of the marker layer; based on core analysis test data of the target layer, core data is homed in the preliminary corrected neutron and density logging curves, and a fusion analysis chart is formed based on this; the fusion analysis chart is corrected in neutron values by using a neutron multiplication factor initial value, and a neutron multiplication factor final value is determined by comparing a formation porosity calculation value obtained by using the corrected neutron and density with a formation porosity measurement value; and the original neutron and density logging curves are comprehensively corrected by using the preliminary correction amount and the neutron multiplication factor final value, so that the formation porosity of a single well is obtained.

This invention discloses an intelligent lithology density logging tool, relating to the field of logging tool technology. It includes a housing, with a spectrometer installed in the central region of the housing. A mounting shell is rotatably connected to the bottom of the housing, driven by a motor installed in a cavity at the bottom of the housing. Sealing and drainage mechanisms are installed at both ends of the spectrometer within the housing, and a cleaning mechanism is installed within the mounting shell. The sealing and drainage mechanism includes a rotating shaft rotatably connected inside the housing. A through-groove is formed on the surface of a sealing plate, and a baffle plate is rotatably connected to the inner wall of the through-groove via a torsion spring. A sealing support assembly is provided below the cylinder, enabling complete drainage of mud from the sealed area. This fundamentally solves the problem of mud obstructing light propagation, leading to discrepancies between detection results and actual values, and also addresses the issue of lithology identification and density measurement deviations caused by mud obstruction on the well wall in traditional logging equipment.

This invention discloses a well-seismic combined seismic data overlay method, relating to the field of geophysical exploration processing and interpretation technology in oil and gas field exploration. The method includes the following steps: S1, acquiring acoustic and density logging data, calculating the wave impedance curve and converting it to reflection coefficients, selecting a wavelet close to the seismic data, convolving it with the reflection coefficients to form a conventional synthetic record, and performing well-seismic calibration; S2, determining the target wavelet for overlay, and convolving it with the reflection coefficients to form a broadband synthetic record; S3, combining well-side seismic data, conventional synthetic records, and broadband synthetic records to construct a sample set, and balancing the number of samples; S4, expanding the sample set through mutation; S5, establishing a nonlinear relationship for overlay based on the sample set; S6, applying the nonlinear relationship to conventional seismic data to obtain high-resolution seismic data. This invention utilizes the advantages of wide bandwidth of well logging data and seismic frequency bands to enhance high-frequency seismic data and broaden the seismic frequency band, thereby improving seismic resolution.

This application discloses a method, apparatus, equipment, and medium for casing coupling identification and influence removal, relating to the field of oil and gas development. The method includes: after correcting the measurement point depth of each detector in a preset density logging tool, determining the target detector based on the source distance information of each corrected detector; when performing sliding windowing on the first formation measurement data corresponding to the target detector based on a preset sliding window, identifying the casing coupling using the local mean and dynamic threshold determined based on the sliding windowing result; determining the target replacement range based on the identified peak position, and determining the target replacement value based on the target replacement range and the second formation measurement data corresponding to each corrected detector in the preset density logging tool (excluding the target detector); and removing peaks from the second formation measurement data based on the target replacement value and the target replacement range to complete the data smoothing and filtering operation, obtaining filtered measurement data. This effectively improves the accuracy of formation density measurement.

The application discloses a rock mechanics parameter prediction method and system based on well logging curves, relates to the oil and gas drilling engineering technical field, and prediction steps are as follows: well logging data acquisition and pretreatment: in the process of drilling in hard strata, the well logging curve data of the acoustic travel time logging curve, the density logging curve, the natural gamma logging curve and the resistivity logging curve are collected, and the collected well logging curve data is pretreated, including removing noise interference, filling missing data and correcting abnormal data points. The rock mechanics parameter prediction method based on the well logging curves and fully considering the combination of the borehole trajectory and the hard strata characteristics is used to fill the current technical blank, accurately analyzes the complex rock mechanics characteristics of the hard strata by integrating multi-source data, and then improves the prediction accuracy, comprehensively contains rich strata information of the well logging curves, and combines the careful consideration of the borehole trajectory.

This invention provides a method and apparatus for identifying oil-water properties in low-contrast reservoir logging, belonging to the field of petroleum exploration and development technology. The method includes: selecting eight lateral resistivity curves that are relatively sensitive to the lithology of the low-contrast reservoir based on its lithology type; calculating the porosity curve of the pure rock skeleton of the reservoir based on the density logging curve; constructing a discrimination curve for the low-contrast reservoir based on the eight lateral resistivity curves and the porosity curve of the pure rock skeleton; identifying the reservoir based on the discrimination curve; and identifying the oil-water properties of the reservoir using the corresponding deep resistivity curve and density curve. This invention solves the problem of difficult effective reservoir identification and improves the accuracy of reservoir oil-water property identification.

The utility model relates to a kind of density logging instrument radioactive source's dismounting device, it is related to density logging instrument radioactive source dismounting equipment technical field.The dismounting device of density logging instrument radioactive source according to the embodiment of the present application when needing to dismount the density logging instrument radioactive source to be prepared, positioning assembly first carries out the collection to its position information, then the position information of the radioactive source to be dismounted collected is sent to second drive component, second drive component can drive radioactive source clamp to move to the radioactive source to be dismounted, so that threaded tool can be positioned with the threaded hole of the radioactive source to be dismounted, while threaded tool and the radioactive source to be dismounted are positioned, limiting piece can be circumferentially limited to the radioactive source to be dismounted to prevent limiting piece in the process of dismounting radioactive source to be dismounted along the axial rotation of threaded tool.Then control component controls second drive component and drives threaded tool to rotate, so that threaded tool can be screwed with the radioactive source to be dismounted, to complete the dismounting or installation of the radioactive source to be dismounted.

A method of constructing a mechanical earth model (MEM) includes integrating a density logging data set to compute vertical stress and applying correlation models or equations to estimate a pore pressure and mechanical properties. The method also includes calibrating the pore pressure with drill stem test data, calibrating the mechanical properties with laboratory tests on core plugs or on rock cuttings, estimating a minimum horizontal stress using correlation models, and calibrating the minimum horizontal stress with minifrac tests. The method further includes estimating a maximum horizontal stress using the correlation models while assuming one or more correlation parameters, calibrating the maximum horizontal stress with a global pattern of tectonic strains and a basin stress regime, evaluating one or more breakout regions using the MEM, a trajectory of a well, and a geometry of a pilot hole, and comparing the one or more breakout regions and a caliper logging data set.

The application provides a rock mechanics parameter determination method, and belongs to the field of oil and gas exploration and development. The method comprises the following steps: performing a point load experiment on a core of coring rock to measure the static uniaxial compressive strength of the rock; calculating the reservoir dynamic uniaxial compressive strength of the rock by using acoustic logging data, and fitting the two to obtain a dynamic-static uniaxial compressive strength fitting model; calculating the static uniaxial compressive strength of the rock for which the core cannot be obtained by using the dynamic-static uniaxial compressive strength fitting model, and calculating the formation elastic modulus of the rock according to the static compressive strength; and calculating the formation Poisson's ratio of the rock according to the drilling mechanical specific energy value, density logging and minimum horizontal stress data of the formation in which the rock is located. The application uses a point load experiment combined with a related empirical formula, uses the obtained core to analyze the rock mechanics parameters of other rocks for which the core cannot be obtained, and provides basic data support for drilling and completion, oil and gas exploitation design and construction.

The present application relates to the technical field of well logging evaluation, and particularly relates to a highest pyrolysis peak temperature calculation method, system, device and readable storage medium. The method comprises the following steps: constructing a first acoustic wave porosity and density porosity difference calculation model according to acoustic travel time logging curves and lithology density logging curves; performing lithology correction on the first acoustic wave porosity and density porosity difference calculation model based on the actual lithology characteristics of the target rock layer to obtain a second acoustic wave porosity and density porosity difference calculation model; performing linear regression on the second acoustic wave porosity and density porosity difference calculation model to establish a highest pyrolysis peak temperature calculation model of the target rock layer. Through the logging continuous characterization of the highest pyrolysis peak temperature, the continuous calculation of the organic geochemical parameters is realized, the limitation that the maturity of the source rock can only be evaluated through the core experiment results is broken, and a technical weapon is provided for the evaluation of the source rock maturity.

The present disclosure relates to the technical field of well logging interpretation, and particularly relates to a method, device, equipment, storage medium and computer program for determining hydrocarbon density, the method comprising: determining distribution characteristics of a hydrocarbon density line based on a preset hydrocarbon density chart; obtaining first compensated neutron logging data and first density logging data of a test well, setting the data in a crossplot chart to obtain a plurality of projection points, and forming a first neutron-density crossplot of the test well; generating a plurality of target hydrocarbon density lines in the first neutron-density crossplot according to rock types of the test well and the distribution characteristics of the hydrocarbon density line, and generating a hydrocarbon density function; and determining a hydrocarbon density value corresponding to each projection point based on the hydrocarbon density calculation function and the hydrocarbon density function. The method provided by the present disclosure can form a hydrocarbon density function corresponding to the rock types of the test well, the calculated hydrocarbon density value will not be offset, and the calculation does not need to use formation pressure test data, thereby realizing rapid and accurate calculation of hydrocarbon density.

The application provides a carbon dioxide storage area safety geologic earthquake combined evaluation method, and the evaluation method comprises the following steps: S1, obtaining an isobath structure map based on three-dimensional seismic data and storage area drilling data; S2, obtaining a two-dimensional seismic profile according to the isobath structure map and interpreting the two-dimensional seismic profile as a two-dimensional geological profile; S3, obtaining overlying rock density ρ according to fault nearby well density logging data; S4, obtaining geological parameters according to the two-dimensional geological profile and calculating cross-section normal stress P; S5, obtaining fault zone argillan content S according to surrounding drilling data; S6, obtaining the formation pressure P1 of the target layer after gas injection according to the gas injection well; S7, obtaining a storage area safety index A according to the cross-section normal stress P and the formation pressure P1, and judging the safety of the storage area according to the safety index. The application provides an effective way for carbon dioxide storage area safety evaluation and provides a reference for carbon dioxide storage area oil and gas exploration and development.

This application provides a waveform processing method and electronic device for numerical simulation of acoustic variable density logging, belonging to the field of numerical simulation technology. The method includes: obtaining an engineering value of the acoustic amplitude based on the calculated acoustic amplitude waveform; calculating the cement bonding index based on the engineering value of the acoustic amplitude; simulating the cement bonding index waveform based on the cement bonding index; and when the positive peak amplitude is greater than a preset threshold, using a numerical simulation waveform processing algorithm to extract the positive peak from the wave train of the cement bonding index waveform, performing variable density map processing, and obtaining a forward-modeled acoustic amplitude variable density map. This application's solution can quantitatively determine the degree of cement bonding based on the cement bonding index and intuitively evaluate the cementing quality based on the forward-modeled acoustic amplitude variable density map.

The application discloses a mine structure detection method based on a multi-parameter imaging technology, and belongs to the technical field of mine structure detection. The method comprises the following steps: S1, a laser scanning mode is used to scan and model the inner side of a mine tunnel, and an inner surface model of the mine is obtained; S2, the mine is divided into a plurality of groups, each group comprising sequentially arranged detection sections and prediction sections; S3, a collection device is arranged in the detection sections, and sound logging curves and density logging curves of the detection sections are obtained; S4, a geological model of the detection sections is constructed according to the information collected in step S3; S5, the prediction sections are sampled according to the geological models of adjacent detection sections, and the geological model is completed; and S6, a mine structure model is obtained according to the geological models of the detection sections and the prediction sections. According to the method, the inner surface model of the mine is established by the surface scanning mode, the inner surface model of the mine is filled correspondingly, and finally, the mine structure model is formed, and the parameter quantization of the mine model is realized.

This invention relates to the field of logging equipment technology, and in particular provides an acoustic variable density logging tool, comprising an upper casing and a lower casing fixedly connected to the upper casing. Both the upper and lower casings have heat insulation layers fitted and fixed to their inner walls. The lower casing contains a carrier plate, a temperature sensor, and a pressure sensing head. A processor is fixed to the carrier plate. A through hole is provided at the bottom of the lower casing, and a corrugated sleeve is fixedly installed within the through hole. A first sealing element is provided inside the corrugated sleeve. The outer walls of the sensing ends of the temperature sensor and the pressure sensing head are tightly sealed to the first sealing element. When abnormal excessive slippage occurs, an alarm signal is promptly issued, allowing operators to promptly monitor the equipment's operating status, avoid equipment malfunctions and downhole accidents, and ensure that the logging tool meets the requirements for safe logging operations in deep wells.

The present application belongs to the technical field of oil and gas exploration and development, and discloses a kind of cap rock natural gas capillary sealing mechanism identification and evaluation method, including the judgment of cap rock natural gas capillary sealing mechanism based on multidimensional data;Cap rock natural gas capillary sealing mechanism evaluation model is constructed;Through density logging, neutron logging and acoustic logging data, gas-bearing layer is identified, and the gas saturation of gas-bearing layer is calculated through density logging and neutron logging data;The breakthrough pressure of sandstone and mudstone is calculated;Based on the number of layers of gas-bearing layer, gas saturation, sandstone breakthrough pressure and mudstone breakthrough pressure, cap rock natural gas capillary sealing mechanism evaluation model is substituted to obtain cap rock natural gas capillary sealing mechanism evaluation parameter.The present application can identify and evaluate the area that part of cap rock sealing capacity is less affected by physical property, overpressure and hydrocarbon concentration and mainly controlled by natural gas capillary sealing mechanism.

This utility model relates to a calibration mechanism for a density logging instrument, specifically in the field of calibration technology for density logging instruments. The embodiment of this application provides a calibration mechanism for a density logging instrument, comprising a calibration component, a moving component, and a positioning component. The calibration component includes a calibration chamber for calibrating the density logging instrument. The moving component is spaced apart from the calibration component in a first direction, and moves the density logging instrument into or out of the calibration chamber. The positioning component is spaced apart from the moving component in a second direction, enabling adjustment and positioning of the density logging instrument and transferring it to the moving component. The density logging instrument calibration mechanism according to this embodiment can automatically complete the movement operation of the density logging instrument, avoiding the risk of radiation exposure for personnel during calibration, and improving the unmanned and intelligent level of density logging instrument calibration.