Disclosed is a three-dimensional digital virtual imaging device for stratigraphic texture of borehole core, wherein the probe depth counting pulley is mounted on the lifting wire frame, the output shaft of the motor is configured to drive the reel to rotate, and one end of the cable is connected to the cable transfer node of the retractable reel, the signal input end of the borehole imaging trajectory measuring probe of the on-site imaging host is electrically connected to one end of the cable through the cable transfer node of the retractable reel, the cable is wound on the retractable reel, a retractable line is controlled by the retractable reel, the cable is extended and retracted on the probe depth counting pulley, the probe depth counting pulley records the length of the retractable line of the cable, the depth feedback signal output end of the depth counting pulley is connected to the depth feedback signal input end of the on-site imaging host, the motor control signal output end of the on-site imaging host is connected to the control signal input end of the motor, and the signal output end of the borehole imaging trajectory measuring probe is connected to the other end of the cable. It can automatically generate borehole video, two-dimensional digital virtual borehole core image and 3D borehole trajectory in real time.

A method of generating geophysical data using at least one source. The method may include the steps of generating a geophysical wavefield with a varying signature using at least one source, wherein the signature is varied in a periodic pattern.

Measured marine survey data can be processed analogously to modeled marine survey data analogously and a misfit can be calculated between the processed measured marine survey data and the processed modeled marine survey data. A model parameter in the modeled marine survey data can be updated based on the misfit. The model parameter can be a parameter of a subsurface location.

This disclosure may relate to a system and method for calculating the mud angle from a downhole device. A method for estimating a mud angle may comprise: disposing a downhole tool into a borehole; extending an arm of the downhole tool to a first location, wherein a pad is disposed on the arm; taking a first impedance measurement with at least one button electrode, wherein the button electrode is disposed in a button array, wherein the button array is disposed on the pad; extending the arm to a second location; taking a second impedance measurement with the at least one button electrode; transmitting the first measurement and the second measurement to an information handling system; and estimating the mud angle from the first impedance measurement and the second impedance measurement with an information handling system.

Naturally-occurring, electromagnetic signals generated by interaction of solar wind with earth's magnetosphere adjacent a borehole are measured by an electromagnetic sensor positioned adjacent the borehole in the hydrocarbon-bearing formation. Electromagnetic signals generated within the borehole are measured over a period of time by a borehole sensor positioned within the borehole. The electromagnetic signals change over the period of time due to variations in fluid distributions within the hydrocarbon-bearing formation. Electromagnetic changes to the electromagnetic signals generated within the borehole and to the passive, naturally-occurring electromagnetic signals over the period of time are determined by one or more processors. A computational model of the hydrocarbon-bearing formation is generated based in part on the electromagnetic changes.

A method of processing controlled source electromagnetic (CSEM) data is provided for reducing the airwave contribution. CSEM data are acquired, for example using a conventional towed source (4) and receiver (5) arrangement. The recorded data are weighted in accordance with the geometrical spreading of the airwave component. The differences between pairs of weighted data records are then formed.

A method of estimating electromagnetic parameters of a geological structure, comprising: providing controlled source electromagnetic, CSEM, data of the structure, calculating a numerical model representing electromagnetic parameters of the structure and generating simulated CSEM data, discretising the numerical model based on prior knowledge of the structure, defining a functional for minimising the distance between said simulated CSEM data and said CSEM data, wherein the functional comprises a regularisation term which depends on prior knowledge of said structure.

A radio test system for testing a device under test is described, comprising a signal generation unit configured to generate a downlink signal to be transmitted to the device under test for over-the-air testing. The radio test system has at least one antenna configured to transmit the downlink signal via an over-the-air transmission channel to the device under test. Further, a receiver is provided that is configured to receive a response signal via the over-the-air transmission channel from the device under test. In addition, the radio test system has at least one over-the-air adapter that is connected to the signal generation unit wherein the over-the-air adapter is configured to adapt the downlink signal to be transmitted such that the over-the-air transmission channel is equalized. Further, a method for testing a device under test is described.

The invention relates to a method and device for measuring the burial depth of lines that are being laid increasingly under a soil surface on land and in water. In order to increase a measurement precision, more than one excitation or transmission coil is used, which extends in an xy plane, the transmission coils are positioned next to one another in a span extending essentially perpendicular to a center axis of the line and are moved over the line along this center axis; the transmission coils transmit electromagnetic pulses in a time-lagged fashion as a primary signal, and receiver coils are used, which are distributed across the array of transmission coils in the xy plane and measure in at least two axes extending orthogonally to one another; and all of the receiver coils measure secondary signals in reaction to the transmission of a primary pulse by the transmission coils.

A system for near-surface geophysical subsurface imaging for detecting and characterizing subsurface heterogeneities comprises an instrument that outputs probing electromagnetic signals through a ground surface that interact and are affected by scattered signals of acoustic waves that travel through the ground surface and further senses vibrational modes of a subsurface below the ground surface; an imaging device that dynamically generates a time sequence of images of properties of the acoustic waves and maps elastic wave fields of the acoustic waves; and a processor that analyzes dynamic multi-wave data of the images to quantify spatial variations in the mechanical and viscoelastic properties of the subsurface.