Petrophysical analysis of modern reef rocks
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On the basis of original fabric, modern reef rock can be divided into two kinds: 1. skeletal framework reef rock, and 2. particle reef rock. The factors that control the pore-system characteristics and their changes are different in the two kinds. In the skeletal framework reef rock the pore system and its development are mainly controlled by (1) the original skeletal pores, and if, with what, and how these pores are filled; and (2) the nature of cementation. In contrast, the pore system and development of the particle reef rock depends strongly upon the type of particles, form of support, and cementation.
Skeletal framework reef rock may be classified into five petrophysical facies (or petrofacies), as follows: A) original coral-skeletal-framework reef rock; B) coral-skeletal-framework reef rock; C) partially recrystallized coral-skeletal framework reef rock; D) cemented skeletal-framework reef rock; and E) cemented skeletal-framework reef rock. Particle reef rock; G) particle-matrix-supported particle reef rock; and H) particle-supported particle reef rock. The most porous reef rocks are assigned to categories A, B and C (mean porosity values as follows: A=34.6%, B=32.3%, C=43.8%). The least porous reef rock is type F (mean=5.46%). Types E and H reef rock have the highest recovery efficiency values (the mean for group E=40.70%, for group H=29.09%).
For skeletal framework reef rock, an inverse correlation between recovery efficiency (RE) and porosity obtains, whereas particle reef rock exhibits a weak positive relationship.
KeywordsCapillary Pressure Aragonite Recovery Efficiency Mercury Porosimetry Capillary Pressure Curve
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