By Kellogg O.D.
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Extra info for Foundations of Potential Theory (GMW 31, 1967)
12 according to the industry standard of China. Generally, there are different gradation for clastic rocks and carbonate rocks due to different types, size, and scale of pores in the two types of rocks. 4 Dual Porosity* Dual porosity has been developed in the oil industry to deal with speciﬁc problems associated with fractured petroleum reservoirs. In the most general sense, the use of dual porosity indicates that the reservoir has a complex porosity system that can be divided into fracture porosity and a smaller scale porosity that exists in the pore spaces within the rocks .
Huang (a) Interparticle pores in sandstone (b) Intraparticle dissolved pore (c) Intercrystalline pore in doloston (d) Fenestral pores (white areas) (e) Moldic pore (g) Tectonic fractures (f)Vuggy (h) Dissolved fracture Fig. 14 Illustration of pore genetic type in reservoir rocks 2 Physical Properties of Reservoir Rocks 29 cement, matrix, and framework. Typically, in any rock it is all the grains of one particular type that are dissolved. Therefore, it requires a distinctive mineralogical or microstructural difference between the solubility of grains and matrix or cements.
11), the speciﬁc surface area of the medium can be easily determined by the formula: S = 8 Â 4pR2/(4R)3. Obviously, the speciﬁc surface area of a porous medium is inversely proportional to the particle radius (R) packing the medium. This conclusion also applies to sedimentary rocks. The speciﬁc surface areas of clastic rocks generally increase with the decrease in Fig. 11 Packing of spherical particles 22 XT. Hu and S. 6). Therefore, speciﬁc surface area can characterize the average size and the dispersion degree of rock particles.