56 results about "Magnetic survey" patented technology

A multi-station gravity and magnetic survey is carried out in a borehole. The data from the survey are processed to estimate the inclination and azimuth of the borehole. The drill collar relative permeability is estimated, and the estimated drill collar permeability is then used to remove the effects of induced magnetization of the drill collar on the magnetic measurements.

The invention relates to the field of geophysical exploration equipment, in particular to a transient electromagnetic exploration device and method based on eccentric coil compensation. The device comprises: a dragging vehicle platform and a height-adjustable high platform. The dragging vehicle platform and the high platform are arranged in parallel; a transmitting coil is laid on the dragging vehicle platform, a receiving coil and a magnetic compensation ring are laid on the plane of the high platform, the receiving coil is eccentrically laid across the transmitting coil, the initial positionof the magnetic compensation ring is located on the high platform and is concentric with the transmitting coil, and the position of the magnetic compensation ring is movably adjusted according to thecondition that a received signal is smaller than a threshold value. According to the invention, a double-platform structure is adopted, the receiving coil is laid at the high platform above the dragging platform, the change degree of the magnetic field intensity of the plane of the high platform is relatively gentle, the weak coupling of the transmitting coil and the receiving coil is realized, and the influence of the physical error of the structure is minimized in the subsequent adjustment process.

The invention discloses a frequency domain electromagnetic exploration method for acquiring resistivity based on a horizontal electric field and a magnetic field. The method comprises the following steps of S1, arranging an observation device, wherein the observation device comprises a transmitter, two power supply electrodes A and B, a measuring point provided with a measuring electrode, and a receiver capable of simultaneously observing the electric field and the magnetic field; S2, enabling the observation device to work normally, receiving an electromagnetic response signal fed back by the measuring point by the measuring equipment, and sending the electromagnetic response signal to a processing device; and S3, the processing device calculating apparent resistivity of different frequencies of the position where the measuring point is located according to the electromagnetic response signal, and the stratum information being obtained through qualitative analysis and quantitative calculation. As the method has no orientation limitation on an electric field and a magnetic field, wide-azimuth electromagnetic ground detection can be realized, and field construction efficiency is greatly improved; and secondly, the apparent resistivity is strictly defined based on an electric field and magnetic field component formula, so the geoelectric information can be accurately reflected, and the influence of the field source emission efficiency on electromagnetic sounding can be eliminated.

The invention discloses a method for constructing a multi-layer equivalent source model computational pole and data type conversion, which comprises the following steps of: inputting magnetic survey data, and performing non-uniform mesh generation on a free space and an underground space according to factors such as an observation position, height data and the like of the observation data; performing three-dimensional inversion calculation on the magnetic measurement data by utilizing a multilayer equivalent source inversion method based on an integral equation, and constructing a multilayer equivalent source model; and utilizing the built multilayer equivalent source model to perform pole transformation and data conversion calculation of the vertical magnetization geomagnetic field, wherein magnetic measurement data is calculated based on a three-dimensional forward modeling calculation method of an integral equation so as to obtain a pole transformation and data type conversion result. According to the method, a calculation framework of an equivalent source model is reconstructed on the basis of an integral equation theory, and high-precision processing of magnetic anomaly data containing a strong demagnetization effect generated by a high-magnetic susceptibility field source is achieved; moreover, the depth regularization factor is adopted, and the adaptive estimation of thedepth position of the multilayer equivalent source model by using the inversion process is realized.

The present invention provides a full-coverage anti-interference artificial source electromagnetic detection method, comprising the following steps: (1) determining the range and position of the survey area; (2) field survey, determining the position of the transmitting source and the angle of the transmitting antenna; (3) Calculate the maximum polarization direction angle of the electric field generated by the antenna at the measuring point; (4) lay out the electric field sensor according to the polarization direction; (5) calculate the apparent resistivity of each measuring point. The method of the invention can obtain the earth resistivity by using the obtained reliable data with a high signal-to-noise ratio, the field construction is flexible and convenient, the construction efficiency is high and the cost is low, the method is reliable and effective, and the invention provides a new direction for the development of the electromagnetic prospecting method.

The invention relates to an instrument fixing device for water area magnetic survey. The device comprises a bottom plate, a box body and a probe rod, the bottom plate is fixed on a ship body, the box body is fixed on the bottom plate, one end of the probe rod is arranged and fixed in the box body, and the other end of the probe rod is used for being connected with a magnetometer probe. The influence of human factors is reduced, the stability of the magnetometer probe and the accuracy of the north direction pointing are improved, and therefore the accuracy of observation data is improved.

The invention belongs to the field of uranium resource prospecting and particularly relates to a geophysical and geochemical prospecting comprehensive method for recognizing hidden volcanite-type uranium mineralization information. The method includes the following steps that firstly, the geophysical and geochemical prospecting survey is conducted; secondly, the mean value and the mean square error are calculated; thirdly, the magnetic survey data first vertical derivative is calculated, and normalization processing is conducted; fourthly, the information contrast is calculated; fifthly, indicators for geochemical prospecting are calculated; sixthly, the ore prospecting potentiality is analyzed. The method can be used for accurately recognizing the geophysical and geochemical prospecting comprehensive abnormal information relevant to deep hidden volcanite-type uranium mineralization, and a basis is provided for building the hidden volcanite-type uranium mineralization prospecting index.

The invention relates to the field of geophysical prospecting equipment, in particular to a transient electromagnetic prospecting system and method based on controllable source compensation. The transient electromagnetic prospecting system comprises a transmitting device, a receiving device, a compensating device and an industrial personal computer, wherein the transmitting device comprises a transmitting controller and a transmitting coil of which the excitation current is controlled by the transmitting controller; the receiving device comprises a receiving controller and a receiving coil which is concentric with the transmitting coil; the compensating device comprises a magnetic sensor, a compensating coil and a compensating controller, the magnetic sensor and the compensating coil are concentric with the transmitting coil, the compensating controller is used for receiving the current of the magnetic sensor to carry out self-adaptive calculation and adjusting the compensating currentin the compensating coil, and the magnetic sensor is used for detecting the magnetic field in the center of the coil and generating a feedback signal when the compensating current is regulated and controlled; the industrial personal computer is in communication connection with the receiving controller and used for displaying the working mode of the system and storing a TEM signals; and the receiving controller transmits synchronization signals, control commands and system parameters to the transmitting controller and the compensating controller. The problem that primary field interference istoo large is solved, the selection precision of the compensating current is improved, and high-precision compensation is realized.

The present application discloses a magnetic measurement method for a two-pole deflection magnet, which includes: according to the measurement stroke of the Hall point measuring machine, dividing the magnetic measurement area of ​​the two-pole deflection magnet to be measured into two or more parts less than or equal to the measurement area The magnetic measurement sub-region of the stroke; move each of the magnetic measurement sub-regions to the range of each measurement stroke in turn, measure and obtain the measurement data of each of the magnetic measurement sub-regions, and the measurement data includes the magnetic measurement sub-region The relative coordinates of the relative coordinates and the magnetic field amount under the relative coordinates; according to the corresponding relationship between the absolute coordinates of the magnetic measurement area and the relative coordinates, the measurement data of each of the magnetic measurement sub-areas is combined to obtain the magnetic field of the magnetic measurement area. Measurement data. The above scheme does not need to lengthen the stroke range of the probe rod of the Hall point measuring machine, so it avoids the problem of poor accuracy of the measurement results caused by the decrease in the running accuracy of the probe rod as its stroke increases; the accuracy of the measurement is guaranteed.