Page 141 - Petrophysics 2E

1 14 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

Percent, Qh

Figure 3.15. Sketch of stratigraphic mod@ed Lorenz plot (SMM) [23].

4. Prepare final stratigraphic flow profile (SFP) with correlation curve,
porosity-permeability k/$ ratio, R35, percent storage, and percent
capacity.
5. Construct an MLP (modified Lorenz plot) by ordering final flow units
in decreasing unit speed @US).

MATHEMATICAL THEORY FLOW UNITS
OF
According to Tiab [24], a hydraulic flow unit is a continuous body
over a specific reservoir volume that practically possesses consistent
petrophysical and fluid properties, which uniquely characterize its static
and dynamic communication with the wellbore. Tiab, Tiab et al., and
Amaefule et al. developed a technique for identifying and characterizing
a formation having similar hydraulic characteristics, or flow units, based
on the microscopic measurements of rock core samples [25-271. This
technique is based on a modified Kozeny-Carman equation and the
concept of mean hydraulic radius. The general form of Equation 3.26 is:

where:

k = permeability, pm2,
$e = effective porosity,
SVgr = specific surface area per unit grain volume,