A high-resolution method for processing coal measures seismic data based on anisotropic medium theories and its application

Authors

LI Huiting, Department of Geosciences and Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaFollow
CHANG Suoliang, Department of Geosciences and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Provincial Center of Technology Innovation for Coal Measure Gas Co-Production, Taiyuan 030024, ChinaFollow
ZHANG Sheng, Department of Geosciences and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Provincial Center of Technology Innovation for Coal Measure Gas Co-Production, Taiyuan 030024, China; Shanxi Institute of Geological Survey Co., Ltd., Taiyuan 030006, China
GUAN Wenyuan, Department of Geosciences and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
ZHAO Xing, Department of Geosciences and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
WANG Weiqian, Shandi Geophysical Prospecting Technology Co., Ltd., Jinzhong 030600, China
TANTAI Mingjun, Department of Geosciences and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
GAO Kaixin, Department of Geosciences and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Abstract

[Objective] The increasing importance of the exploration and exploitation of deep resources poses new requirements for high-precision seismic exploration. Given that conventional isotropy-based data processing methods are no longer applicable to the coal-bearing strata with strong anisotropy. [Methods] This study proposed a method for processing seismic data based on theories of both transverse isotropy medium with a vertical symmetry axis (VTI) media and transverse isotropy with a horizontal axis of symmetry (HTI) media. First, to characterize the depositional characteristics of coal-bearing strata, this study analyzed the features of VTI media, revealing that high-order dynamic correction can effectively eliminate anisotropy-induced event bending in large-offset seismic data, thus ensuring that the common reflection points in both far and near channels can be in-phase and improving the data stacking and imaging quality. Second, targeting the characteristics of tectonic fissures, this study relied on the azimuthal anisotropy analysis of HTI media. Specifically, using Offset-Vector Tiles (OVT) domain processing, the influence of varying azimuthal differences on data was removed by establishing the parameter fields of azimuthal anisotropy. Using both methods, this study developed a practical processing and correction method suitable for target strata with anisotropy by establishing a rational process and choosing optimal key parameters. This method can achieve effective velocity analysis and data stacking of coal-bearing strata under complex conditions, thus improving the resolution and interpretation accuracy of coal measures seismic data. [Results and Conclusions] The application results indicate that the new method can obtain seismic data with higher dominant frequency and a wider frequency band and is more advantageous in identifying the features of small structures and characterizing paleogeographic environments, thereby providing strong support for the fine-scale geological interpretation. This study highlighted the necessity of the processing of anisotropy for coal-bearing strata, potentially promoting the applications of anisotropy processing techniques in wide-azimuth seismic explorations.

Keywords

coal-bearing strata, VTI medium, HTI medium, higher-order dynamic correction, OVT domain processing

DOI

10.12363/issn.1001-1986.23.10.0712

Recommended Citation

LI Huiting, CHANG Suoliang, ZHANG Sheng, et al. (2024) "A high-resolution method for processing coal measures seismic data based on anisotropic medium theories and its application," Coal Geology & Exploration: Vol. 52: Iss. 6, Article 15.
DOI: 10.12363/issn.1001-1986.23.10.0712
Available at: https://cge.researchcommons.org/journal/vol52/iss6/15

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