Journal
JOURNAL OF GEOPHYSICS AND ENGINEERING
Volume 17, Issue 3, Pages 463-474Publisher
OXFORD UNIV PRESS
DOI: 10.1093/jge/gxaa005
Keywords
gas-bearing reservoir; low-frequency shadow; slow P-wave; attenuation; poroelastic models
Categories
Funding
- National Key R&D Program of China [2018YFA0702502]
- National Natural Science Foundation of China [41974118, U19B6003]
- National Science and Technology Major Project of China [2017ZX05035004-003]
- Science Foundation of China University of Petroleum (Beijing) [2462018BJC001]
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Seismic low-frequency amplitude shadows have been widely used as a hydrocarbon indicator. This study investigates the effect of reservoir properties and seismic wave mode conversion on the characteristics of the low-frequency amplitude shadows in gas-bearing reservoirs. The target gas reservoirs are typically related to the lithology of tight sandstone with strong heterogeneity. Pore-fluid distribution within the reservoirs presents patchy saturation in the vertical and horizontal directions, and this patchy saturation easily induces low-frequency shadows beneath gas-bearing reservoirs. These low-frequency shadows are validated by using a poroelastic simulation method. The results of our field case-based study indicate that pore-fluid property, plus the thickness and heterogeneity of reservoirs are the key elements in the generation of low-frequency shadows. The results also indicate that the poroelastic simulation method can be used to effectively predict the spatial distribution of gas-bearing reservoirs, by directly verifying the low-frequency shadow phenomenon existing in the seismic data.
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