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[[File:GeoWikiWriteOff2021-Muamamr-Figure1.png|framed|center|{{Figure number|1}}Well log section showing the difference of rock physics properties between clean sandstone (Sand A), clayey sandstone (Sand B), and claystone.]]

[[File:GeoWikiWriteOff2021-Muamamr-Figure1.png|framed|center|{{Figure number|1}}Well log section showing the difference of rock physics properties between clean sandstone (Sand A), clayey sandstone (Sand B), and claystone.]]

As the available dataset is composed of gas saturated sands, one can model the expected elastic properties under wet condition by utilizing Gassmann’s Fluid Substitution[2], [3]). The result of fluid substitution on Sand A and Sand B are shown on [[:File:GeoWikiWriteOff2021-Muamamr-Figure2.png|Figure 2]]. It can be observed that wet sands are acoustically harder (higher Vp and Rho, but with minor change in Vs) compared to gas sands, some of these wet sands are acoustically harder than the claystones.  

As the available dataset is composed of gas saturated sands, one can model the expected elastic properties under wet condition by utilizing Gassmann’s Fluid Substitution.<ref name=2Gassman>Gassmann, F., 1951, Elastic Waves Through a Packing of Spheres: Geophysics, v. 16, no. 4, p. 673-685.<r/ef><ref name=2Dvorkinetal>Dvorkin, J., G. Mavko, and B. Gurevich, B., 2007, Fluid substitution in shaley sediment using effective porosity: Geophysics, v. 72, no. 3, p. O1-O8.</ref> The result of fluid substitution on Sand A and Sand B are shown on [[:File:GeoWikiWriteOff2021-Muamamr-Figure2.png|Figure 2]]. It can be observed that wet sands are acoustically harder (higher Vp and Rho, but with minor change in Vs) compared to gas sands, some of these wet sands are acoustically harder than the claystones.  

[[File:GeoWikiWriteOff2021-Muamamr-Figure2.png|framed|center|{{Figure number|2}}Fluid substitution result of Sand A and Sand B.]]

[[File:GeoWikiWriteOff2021-Muamamr-Figure2.png|framed|center|{{Figure number|2}}Fluid substitution result of Sand A and Sand B.]]

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2. Gassmann, F., 1951, Elastic Waves Through a Packing of Spheres, Geophysics, 16(4), pp. 673-685.  

2.  

3 Dvorkin, J., Mavko, G. and Gurevich, B., 2007, Fluid Substitution in Shaley Sediment Using Effective Porosity, Geophysics, 72(3), pp. O1-O8.

3  

4 Avseth, P., Janke, A. and Horn, F., 2016, AVO Inversion in Exploration – Key Learnings from a Norwegian Sea Prospect, The Leading Edge, 35(5), pp. 405-414.  

4 Avseth, P., Janke, A. and Horn, F., 2016, AVO Inversion in Exploration – Key Learnings from a Norwegian Sea Prospect, The Leading Edge, 35(5), pp. 405-414.