Application of GeoEast system in seismic data processing of Permian volcanic rocks in JY area of Sichuan Basin
PENG Haotian1, RAN Qi1, CHEN Kang1, ZHANG Guangrong2, ZHANG Fuhong2, HE Qinglin1
1. Research Institute of Petroleum Exploration and Development, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610095, China; 2. Oil and Gas Resources Division, Southwest Oil & Gas Field Company, PetroChina, Chengdu, Sichuan 610051, China
Abstract：Volcanic gas reservoirs in the JY area of the Sichuan Basin have a favorable prospect for exploration. However, due to the complex internal structures of the reservoirs, various characteristics of volcanic edifices, and rapid changes in lithology and lithofacies, it is impossible to accurately describe volcanic rocks and volcanic edifices on sections. Therefore, this paper builds a volcanic rock model according to actual data and employs the reverse-time migration method of the viscoelastic media wave equation to analyze the shielding effect of volcanic rock stratum on seismic wave propagation. The key points of seismic data imaging in the volcanic rock area are found, and then the GeoEast system is utilized to build the corresponding broadband fidelity processing procedure. Low-frequency protection and denoising technology, low-frequency compensation technology, and multi-information constrained depth domain Q migration technology are the focus for improving the energy and signal-to-noise ratio of effective signals at low-frequency ends and expanding the seismic data to high-frequency bands. The results are as follows. ①Volcanic rock development exerts a strong shielding effect on seismic wave propagation. Low-frequency signals with stronger penetration ability are more favorable for boundary imaging, and high-frequency signals are more favorable for imaging inside volcanic rocks. ②Low-frequency preserving processing can improve the energy and signal-to-noise ratio of effective signals at the low-frequency end, raising the imaging quality. ③Q migration technology can effectively improve the resolution of seismic data and provide evidence for the interpretation of volcanic rocks and volcanic channels. The newly processed section has clearer volcanic rock envelopes, richer internal reflection details, and easier identification of top and bottom reflection interfaces, which has laid a solid foundation for the fine characterization of volcanic rocks.
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PENG Haotian, RAN Qi, CHEN Kang, ZHANG Guangrong, ZHANG Fuhong, HE Qinglin. Application of GeoEast system in seismic data processing of Permian volcanic rocks in JY area of Sichuan Basin. Oil Geophysical Prospecting, 2022, 57(s1): 6-14.
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