Research on anisotropy of shale oil reservoir based on rock physics model

Rock physics modeling is implemented for shales in the Luojia area of the Zhanhua topographic depression. In the rock physics model, the clay lamination parameter is introduced into the Backus averaging theory for the description of anisotropy related to the preferred alignment of clay particles, an...

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Bibliographic Details
Published in:Applied geophysics 2016-06, Vol.13 (2), p.382-392
Main Authors: Guo, Zhi-Qi, Liu, Cai, Liu, Xi-Wu, Dong, Ning, Liu, Yu-Wei
Format: Article
Language:English
Subjects:
Anisotropy
Clay
Clay (material)
Correlation
Density
Earth and Environmental Science
Earth Sciences
Fracture mechanics
Geologic depressions
Geophysics
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Inversions
Mathematical models
Minerals
Oil reservoirs
Oil shale
Permeability
Physics
Rock
Rocks
Shales
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Summary:Rock physics modeling is implemented for shales in the Luojia area of the Zhanhua topographic depression. In the rock physics model, the clay lamination parameter is introduced into the Backus averaging theory for the description of anisotropy related to the preferred alignment of clay particles, and the Chapman multi-scale fracture theory is used to calculate anisotropy relating to the fracture system. In accordance with geological features of shales in the study area, horizontal fractures are regarded as the dominant factor in the prediction of fracture density and anisotropy parameters for the inversion scheme. Results indicate that the horizontal fracture density obtained has good agreement with horizontal permeability measured from cores, and thus confirms the applicability of the proposed rock physics model and inversion method. Fracture density can thus be regarded as an indicator of reservoir permeability. In addition, the anisotropy parameter of the P-wave is higher than that of the S-wave due to the presence of horizontal fractures. Fracture density has an obvious positive correlation with P-wave anisotropy, and the clay content shows a positive correlation with S-wave anisotropy, which fully shows that fracture density has a negative correlation with clay and quartz contents and a positive relation with carbonate contents.
ISSN:1672-7975
1993-0658
DOI:10.1007/s11770-016-0554-0