Abstract
To solve problems in small-scale and complex structural traps, the inverse Gaussian-beam stack-imaging method is commonly used to process crosswell seismic wave reflection data. Owing to limited coverage, the imaging quality of conventional ray-based crosswell seismic stack imaging is poor in complex areas; moreover, the imaging range is small and with sever interference because of the arc phenomenon in seismic migration. Thus, we propose the inverse Gaussian-beam stack imaging, in which Gaussian weight functions of rays contributing to the geophones energy are calculated and used to decompose the seismic wavefield. This effectively enlarges the coverage of the reflection points and improves the transverse resolution. Compared with the traditional VSP-CDP stack imaging, the proposed methods extends the imaging range, yields higher horizontal resolution, and is more adaptable to complex geological structures. The method is applied to model a complex structure in the K-area. The results suggest that the wave group of the target layer is clearer, the resolution is higher, and the main frequency of the crosswell seismic section is higher than that in surface seismic exploration The effectiveness and robustness of the method are verified by theoretical model and practical data.
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Acknowledgments
First and foremost, I would like to express my deepest gratitude to everyone in our research projects’ group who have provided valuable guidance at every stage of the study. Without their impressive kindness and patience, I could not have completed my thesis. Secondly, I extend my thanks to Dr. Yang, the first co-author of the article, for all his kindness and help. I would also like to thank all my teachers who have helped me to develop fundamental and essential academic competence. Last but not least, I’d like to thank all my friends for their encouragement and support.
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This research work is sponsored by the National Key R&D Plan Project (Grant No. 2016YFC0303900) and Natural Science Foundation of China (Grant No. 41374145).
Wei Zheng-Rong is a Ph.D. candidate in Geophysical Exploration at Chang’an University, China. His research interests are borehole seismic data processing, seismic wavefield modeling, and migration imaging. E-mail: 544109454@qq.com
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Wei, Z.R., Yang, FL., Liu, BH. et al. Inverse Gaussian-beam common-reflection-point-stack imaging in crosswell seismic tomography. Appl. Geophys. 16, 349–357 (2019). https://doi.org/10.1007/s11770-019-0768-z
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DOI: https://doi.org/10.1007/s11770-019-0768-z