Due to the lack of stiffness coefficient c12 information in seismic data of VTI (vertical axis symmetry transverse isotropy) media, it is still challenging to obtain the brittleness index of transversely isotropic (BIVTI) directly from seismic data. In this paper, we established the approximate relation c12 by using the rock physics model, and obtained BIVTI directly from seismic data based on the exact reflection coefficient equation. Firstly, we first derive an approximate expression for c12 through shale rock physics analysis. Secondly, we have proposed a method for obtaining BIVTI from seismic data using the Graebner exact reflection coefficient equation. This methoud considers the influence of horizontal slowness and deriving a more accurate Jacobian Matrix. Finally, we established the inversion method using model well tests, demonstrating the methods superior precision and noise resistance. Compared with the traditional brittleness index, BIVTI obtained by the inversion method can better characterize the reservoir brittleness.
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SEG/AAPG International Meeting for Applied Geoscience & Energy
August 26–29, 2024
Houston, Texas
A method for inverting the brittleness index in transversely isotropic formations based on the exact reflection coefficient equation
QiYu Yang;
QiYu Yang
China University of Petroleum (Beijing)
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Jingye Li;
Jingye Li
China University of Petroleum (Beijing)
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Jinming Cui;
Jinming Cui
China University of Petroleum (Beijing)
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Yongping Wang;
Yongping Wang
China University of Petroleum (Beijing)
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Yuning Zhang
Yuning Zhang
China University of Petroleum (Beijing)
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Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, Houston, Texas, August 2024.
Paper Number:
SEG-2024-4093897
Published:
August 26 2024
Citation
Yang, QiYu, Li, Jingye, Cui, Jinming, Wang, Yongping, and Yuning Zhang. "A method for inverting the brittleness index in transversely isotropic formations based on the exact reflection coefficient equation." Paper presented at the SEG/AAPG International Meeting for Applied Geoscience & Energy, Houston, Texas, August 2024. doi: https://doi.org/10.1190/image2024-4093897.1
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