Geophysical research: article

RESOLUTION ESTIMATION OF REFLECTED AND REFRACTED WAVES IN CROSS-WELL STUDIES BASED ON FRESNEL VOLUME MODELING
A.V. Chugaev
Mining Institute of the Ural Branch of the Russian Academy of Sciences
Journal: Geophysical research
Tome: 24
Number: 3
Year: 2023
Pages: 69-86
UDK: 550.832.4:534.213
DOI: 10.21455/gr2023.3-4
Full text
Keywords: first Fresnel zone, Fresnel volume, head waves, seismic exploration, cross-well survey, resolution.
Аnnotation: The principles of propagation and registration of seismoacoustic pulses in three-dimensional space are considered using the case of cross-well survey near the boundary with abrupt change in the velocities of elastic waves. Modeling of constructive interference was performed to estimate the volume of the first Fresnel zone and the resolution of seismic studies on refracted and reflected waves in wells with 2D and 3D versions. It is shown that the Fresnel volume of head waves is compressed along the boundary plane in accordance with the distance in-creasing between the source and the receiver from the boundary. Calculations of the Fresnel volume of refract-ed and reflected waves are given for various variants of the relative positions of sources and receivers. It is concluded that the projection of the Fresnel volume of the head wave onto the plane of the high-speed refractive layer can be found by moving the excitation and reception points along the normal to this layer. As a conse-quence, if during cross-well survey the wells are perpendicular to the refractive layer, then the projection of the Fresnel volume of head waves onto this layer is practically independent of the position of the source and receiver in the well. Quantitative estimates of the resolution of borehole seismoacoustic techniques for studying the rock mass have been obtained.
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