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52 Reservoir Formation Damage
VUGGY PORE SPACE
SEPARATE-VUG PORES TOUCHING-VUG PORES
(VUG-TO-MATRIX-TO-VUG CONNECTION) (VUG-TO-VUG CONNECTION)
GRAIN- AND MUD-
GRAIN-DOMINATED FABRIC MUD-DOMINATED FABRIC
DOMINATED FABRICS
EXAMPLE TYPES EXAMPLE TYPES EXAMPLE TYPES
MoMic Moldic Cavernous
pores
Breccia
Intrafossil
pores
Fractures
Shelter
pores
Solution-
enlarged
fractures
Figure 3-2. Geological and petrophysical classification of the rock vuggy pore
structure (after F. J. Lucia, AAPG Bulletin, Vol. 79, No. 9, AAPG ©1995;
reprinted by permission of the American Association of Petroleum Geologists
whose permission is required for future use).
Then, given the bulk volume, V B, the porosity is expressed by:
(3-2)
7 6V B
The pore surface is given by:
2
\ /3x2/3 (3-3)
The specific pore surface in terms of the pore surface per pore volume
is given by:
