14 results about "Induction logging" patented technology

The application discloses a kind of based on deep learning's seismic brine reservoir response feature identification method, by fusing induction logging data and seismic inversion result, break through the technical limitation that brine reservoir feature response is weak to traditional acoustic logging, improve the accuracy of reservoir identification;Improved UNET++ network structure utilizes dense skip connection and channel attention mechanism, effectively integrates multi-scale geological features, enhances the capture ability of thin layer brine weak reflection signal, improves the accuracy of boundary identification;Introduce bidirectional LSTM and spatial feature alignment technology, realize the depth fusion of logging vertical feature and seismic horizontal profile, optimize horizon matching relationship, effectively reduce the risk of misjudgment caused by velocity anomaly;Based on deep supervision mechanism and joint training strategy, generate three-dimensional reservoir spatial distribution model, realize the description of deep pore-fracture type brine reservoir, greatly improve exploration efficiency, provide reliable technical support for brine resource positioning under complex geological conditions.

This invention provides a method, apparatus, and system for multi-point temperature correction of an array induction logging tool. The method includes: acquiring measurement signals from the array induction logging tool during temperature changes, the measurement signals being detected by a preset number of temperature sensors; constructing a temperature coefficient matrix for each temperature sensor based on the measurement signal, resulting in a preset number of temperature coefficient matrices; calculating a temperature correction coefficient matrix based on each temperature coefficient matrix; acquiring actual measurement signals from the array induction logging tool downhole, and performing temperature correction on the measured signals based on the temperature correction coefficient matrix. The multi-point temperature correction method for an array induction logging tool provided by this invention can calculate the temperature correction coefficient matrix based on the actual measurement signals and correct the measured signals based on the temperature correction coefficient matrix, thus avoiding errors caused by formation temperature changes and improving the accuracy and reliability of the array induction logging tool.

The application discloses a kind of induction logging instrument systems and acquisition method based on plasma optical fiber sensor, including ground current emission source and at least one well in current emission source and well in receiving acquisition device, the well in receiving acquisition device is connected with the optical system of induction signal detection being arranged on ground, the optical system is composed of sequentially connected broadband light source, polarizer, polarization controller, fiber optic circulator and spectrum analyzer, the fiber optic circulator is connected with well in receiving acquisition device and spectrum analyzer respectively, at least two plasma resonance optical fiber sensing probes are arranged in the well in receiving acquisition device. There is no mutual interference or crosstalk between plasma resonance optical fiber sensor, optical fiber sensor and emission power supply and antenna, and it is not easy to be disturbed by environmental electromagnetic noise, and multi-channel large data high-speed real-time transmission can be realized by using armored photoelectric composite cable connected with each well in receiving acquisition device.

The application provides a large-inclination well / horizontal well array induction logging resistivity anisotropy correction method and relates to the field of geological exploration. The method comprises the following steps: modeling by adopting a three-dimensional finite difference method, performing array induction logging response simulation, and simulating the variation law of apparent resistivity under different inclination angles; establishing a resistivity correction chart according to the variation law of the apparent resistivity under different inclination angles obtained by simulation; if the anisotropy coefficient of the measured target well is known, a correction formula is obtained by chart fitting, and the resistivity is corrected through the correction formula; if the anisotropy coefficient of the measured target well is unknown, the anisotropy coefficient is calculated through a build-up section, a correction formula is obtained by chart fitting, and the resistivity is corrected through the correction formula. The method can effectively eliminate the resistivity'spike' phenomenon of the logging result, obtain a more approximate real formation resistivity value, and improve the accuracy of the reservoir evaluation of the large-inclination well and the horizontal well.

The invention relates to a gas-water reservoir evaluation method based on array induction logging, and belongs to the technical field of petroleum logging interpretation and reservoir evaluation. The method comprises the steps of firstly obtaining basic physical property parameters of a stratum, then establishing a mud dynamic invasion physical model, calculating the distribution rule of the water saturation of a gas-water reservoir and the formation water mineralization degree along with the change of time and radial distance in the mud invasion process, and further determining the formation resistivity radial distribution characteristics influenced by mud invasion. And comparing and verifying the array induction time lapse response calculated by numerical simulation with the actually measured array induction logging data to determine the mud invasion depth and invasion zone characteristics, thereby accurately identifying the gas layer, the same gas-water layer and the water layer. According to the method, the influence of capillary pressure on gas-water two-phase flow and the diffusion mixing process of slurry filtrate and formation water are considered, the dynamic slurry invasion process can be accurately described, and the well logging interpretation precision and reliability in tight sandstone gas-water reservoir evaluation are remarkably improved.

An oil-water identification method based on RPFE characteristics of undisturbed formation can identify oil and water layers, and the oil-water identification method is based on the dispersion of the original signal of array induction logging, mapping a spectrum image of the array induction logging sub-array 7, and forming a two-dimensional oil-water identification chart by using the dispersion and the product of the resistivity after borehole correction and the formation porosity, and the test of actual logging data shows that this method can accurately and effectively divide the oil and water layers, and improve the efficiency of the oil-water evaluation in reservoir.

The invention discloses a fracture surface density parameter prediction method and device based on array induction logging, and the method comprises the steps: obtaining at least three initial resistivity curves of a target well through an array induction mode; the at least three initial resistivity curves are preprocessed, at least three target resistivity curves are obtained, and data noise in the target resistivity curves is smaller than data noise in the initial resistivity curves; based on the at least three target resistivity curves, determining an initial crack surface feature vector of the target well, and performing normalization processing on the initial crack surface feature vector to obtain a target crack surface feature vector; and inputting the target fracture surface feature vector into the target prediction model for analysis to obtain a fracture surface density parameter of the target well, thereby solving the technical problem that the fracture surface density parameter is difficult to stably predict under the condition of a high-angle or vertical fracture.

This invention discloses an adaptive wellbore correction method based on a wellbore response database, belonging to the field of geophysical logging technology. This adaptive wellbore correction method, based on a wellbore response database, is applied to actual logging data from the small-diameter array induction logging instrument HACRT. For wellbore impacts with intrusion, a wellbore correction model with intrusion is introduced. The intrusion impact is calculated using geometric factors, and the wellbore response is calculated using the wellbore response database to obtain a logging response estimate. This invention solves problems such as skin effect correction of the wellbore model response signal, inconsistency between the wellbore model and the actual logging environment, and multiple solutions in wellbore model parameter inversion. It considers engineering problems in actual logging data processing and is adaptable to harsh well conditions such as larger well diameters and low-resistivity salt-cement slurries.

The embodiment of the invention provides an induction logging simulation method and device based on digital twinning and electronic equipment, and relates to the technical field of logging. The method comprises the following steps: respectively analyzing and modeling according to various characteristic parameters of the induction logging instrument to obtain an instrument model; performing detection characteristic analysis according to the instrument model to obtain detection characteristics of the instrument model; performing parameter optimization design on the instrument model according to the detection characteristics to obtain an instrument twinborn body corresponding to the induction logging instrument; and performing induction logging simulation on the environmental stratum model according to the instrument twinborn body to obtain a simulation result. According to the implementation mode provided by the invention, simulation and optimization of the induction logging operation are provided, and real-time monitoring and intelligent diagnosis of the operation process are provided.

The application discloses a kind of inclined shaft anisotropy has the fast calculation method of invasion stratum induction logging response, it is related to the technical field of electrical logging in oil exploration and development, comprising: constructing three-dimensional heterogeneous stratum model containing inclined shaft anisotropy invasion;Extracting invasion zone longitudinal model and original stratum longitudinal model;Considering induction logging instrument parameters, using semi-analytical algorithm and 0-dimensional inversion, obtain equivalent stratum model;Point by point construction radial heterogeneous model;In turn calculate the response of induction logging instrument different source distance and frequency operating mode, each mode response combination obtains induction logging synthetic apparent resistivity curve;Through all measurement depth points point by point cycle calculation, finally obtain the logging response of whole well section.The inclined shaft anisotropy has the hierarchical superposition of stratum decomposition for invasion, by combining semi-analytical solution and neural network algorithm, induction logging response calculation speed is improved more than three orders of magnitude.

The present application belongs to the technical field of induction logging data processing, and discloses an induction logging iterative borehole correction method and device. The data of n sub-arrays under different hole diameters and borehole influence factors are fitted to determine a first formula of the borehole influence factors and the first ratio of the n sub-arrays under different hole diameters. According to the first formula, the coefficients a, b and c of different sub-arrays under different hole diameters are determined. A given initial formation apparent conductivity value is used to calculate the borehole influence factor according to the first formula. The borehole influence factor is brought into a second formula to calculate the formation apparent conductivity. The formation apparent conductivity is brought into the first formula to calculate the borehole influence factor, and the result is brought into the second formula for iterative calculation to obtain the formation conductivity response value not affected by the borehole mud. The present application can be applied in induction logging data inversion and does not have the inversion process, and can obtain the formation conductivity response value not affected by the borehole mud.

The invention belongs to the technical field of geophysical logging, and particularly relates to a digital stratum model construction method and system, a storage medium and equipment, and the method comprises the steps: collecting and screening original data related to geology, and building a three-dimensional cylindrical or cuboid digital stratum model as a solid model; according to the established digital stratum model, the response characteristics of the corresponding stratum are calculated and simulated in combination with data related to the induction logging instrument; a post-processing function of the COMSOL is used to inspect distribution of a three-dimensional electric field, a three-dimensional magnetic field and eddy current, and response mechanisms of different array conditions are researched. The method has the effect of being suitable for calculation and simulation of response characteristic numerical values under specific stratum conditions.

The application discloses a high-precision forward method for electromagnetic field of a fracture formation induction logging instrument based on Born approximation, and comprises the following steps: 1) calculating electromagnetic field distribution in a formation without fractures; 2) calculating the influence of fractures on original electromagnetic field; and 3) superimposing the value of electromagnetic field in the formation without fractures and the influence of fractures on the original electromagnetic field to obtain an actual electromagnetic field. The method strictly considers the geometric shape of the fractures, and avoids directly carrying out grid division on the fracture area, so that the calculation result of the actual electromagnetic field is more accurate.

This invention belongs to the field of oil and gas exploration and development technology, and discloses an induction logging tool transmission drive module and driving method. The drive module includes a MOS full-bridge chip U1 mounted on a substrate. One end of the GND wire is connected to the common ground pin and the heat dissipation pad pin, and the other end of the GND wire is connected to the negative power supply. The two ends of the IN2 wire are connected to the second input pin and the controller, respectively. The two ends of the IN1 wire are connected to the first input pin and the controller, respectively. The two ends of the VCC wire are connected to the voltage monitoring pin and the positive power supply, respectively. The first output pin is connected to one end of the transmission coil, and the second output pin is connected to the other end of the transmission coil. This invention's drive module, through the MOS full-bridge chip U1, can be used in various scenarios with selected components. It requires fewer discrete components, reducing its size to less than 1 / 10 of the original, and can be installed in confined spaces.