P- and S-wave energy current density vectors dot product imaging condition of source time-reversal imaging

Hu，Nan1,2; Zhang，Wei2,3,4; Xu，Jincheng2,3,4; Yang，Hui2,3,4; Li，Yanpeng5

2023-09-01

10.1093/gji/ggad196

Geophysical Journal International   Impact Factor & Quartile

0956-540X

1365-246X

Source time-reversal imaging (TRI) based on decoupled elastic wave equation can utilize vector P- and S-wave time differences and achieve high-precision source location in complex geological models. The imaging condition is critical for TRI. However, because of the orthogonally polarized properties of P and S waves, traditional vector dot product imaging condition directly applied to TRI will decrease the effective imaging values. In contrast, the energy current density vectors of P and S waves represent the propagation directions of the wavefields and are almost parallel. Their dot product can result in the maximum imaging energy. Based on this principle, we propose a P- and S-wave energy current density vectors dot product imaging condition (PSEDPIC), which uses the propagation direction information of P and S waves at the source point to suppress imaging artefacts generated by waves with inconsistent propagation directions. Numerical tests reveal that PSEDPIC can (1) reduce the image artefacts, (2) improve the imaging spatial resolution and (3) allow a shallower imaging region. In addition, if the numerical simulation algorithm used in TRI can reconstruct the seismic wavefield accurately in the presence of surface topography, the impact of an observation system with elevation differences on imaging can be eliminated automatically. For this reason, we use the curvilinear grid finite-difference method to directly reconstruct the wavefield in TRI to solve the problem of data elevation correction. The test results of 3-D synthetic and field data for microseismic monitoring demonstrate the effectiveness of the proposed method.

Computational seismology Earthquake source observation Inverse theory Microseismic monitoring Source time-reversal imaging

SCI

English

Corresponding

National Natural Science Foundation of China[41974122];National Natural Science Foundation of China[42174128];

Geochemistry & Geophysics

Geochemistry & Geophysics

WOS:000995030800002

OXFORD UNIV PRESS

GEOSCIENCES

2-s2.0-85161079007

Scopus

1.School of Astronautics,Harbin Institute of Technology,Harbin,150001,China
2.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China
3.Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology,Southern University of Science and Technology,Shenzhen,518055,China
4.Guangdong Provincial Key Laboratory of Geophysical High-resolution Imaging Technology,Southern University of Science and Technology,Shenzhen,518055,China
5.BGP Inc.,China National Petroleum Corporation,Zhuozhou,072750,China

Hu，Nan,Zhang，Wei,Xu，Jincheng,et al. P- and S-wave energy current density vectors dot product imaging condition of source time-reversal imaging[J]. Geophysical Journal International,2023,234(3):2180-2198.

Hu，Nan,Zhang，Wei,Xu，Jincheng,Yang，Hui,&Li，Yanpeng.(2023).P- and S-wave energy current density vectors dot product imaging condition of source time-reversal imaging.Geophysical Journal International,234(3),2180-2198.

Hu，Nan,et al."P- and S-wave energy current density vectors dot product imaging condition of source time-reversal imaging".Geophysical Journal International 234.3(2023):2180-2198.