Published in Applied Geophysics
In this study, we propose a new method for water holdup measurement of oil-in-water emulsions with a microwave resonance sensor (MRS). The angle and length of the electrode plate are optimized by HFSS simulation software. Using a vector network analyzer (VNA), a static calibration experiment is conducted, and the resonant frequency distribution of ...
Published in Applied Geophysics
The forward calculation of gravity anomalies is a non-negligible aspect contributing to the time consumption of the entire process of basement relief estimation. In this study, we develop a fast hybrid computing scheme to compute the gravity anomaly of a basement. We use the vertical prism source equation in a given region R centered at a certain g...
Published in Applied Geophysics
We calculated the crustal stress field using the composite focal mechanism method based on the P-wave initial motion polarity data of the Tengchong volcanic area from January 2011 to April 2019 obtained from the Bulletin of Seismological Observations of Chinese stations. The magnitude range of earthquakes used in this study is 0–4, and their magnit...
Published in Applied Geophysics
The distributions of local velocity and local phase holdup along the radial direction of pipes are complicated because of gravity differentiation, and the distribution of fluid velocity field changes along the gravity direction in horizontal wells. Therefore, measuring the mixture flow and water holdup is difficult, resulting in poor interpretation...
Published in Applied Geophysics
Deep learning technologies are increasingly used in the field of geophysics, and a variety of algorithms based on shallow convolutional neural networks are more widely used in fault recognition, but these methods are usually not able to accurately identify complex faults. In this study, using the advantage of deep residual networks to capture stron...
Published in Applied Geophysics
The existing methods for extracting the arrival time and amplitude of ultrasonic echo cannot effectively avoid the local interference of ultrasonic signals while drilling, which leads to poor accuracy of the echo arrival time and amplitude extracted by an ultrasonic imaging logging-while-drilling tool. In this study, a demodulation algorithm is use...
Published in Applied Geophysics
To better understand characteristics of seismic signals of tracked vehicles measured when passing a sensor line, we numerically modelled force-pulse responses of a layered soil that is similar in its seismic properties to that found at the original measurement site. The vertical-force pulses from the road wheels rolling over the track elements are ...
Published in Applied Geophysics
Surface and borehole gravity data contain complementary information. Thus, the joint inversion of these two data types can help retrieve the real spatial distributions of density bodies. When a sharp boundary exists between an anomalous density body and its surrounding rock, the interface recovered by smooth inversion with Tikhonov regularization i...
Published in Applied Geophysics
Most traditional ground roll separation methods utilize only the difference in geometric characteristics between the ground roll and the reflection wave to separate them. When the geometric characteristics of data are complex, these methods often lead to damage of the reflection wave or incompletely suppress the ground roll. To solve this problem, ...
Published in Applied Geophysics
In petroleum seismic exploration, dense seismic ray coverage is often guaranteed through dense seismic sources and geophones. Dense ray coverage facilitates the high-resolution 3D velocity structure imaging of near surfaces using surface waves. In this study, the 3D velocity and anisotropy structure of a petroleum exploration area are obtained usin...
