Page 280 - Well Logging and Formation Evaluation

270 Well Logging and Formation Evaluation

Viscosity

-3
1 centipoise (cp) = 10 Pa.s

Concentration

–
To convert ppm of [Cl ] to [NaCl], you must multiply by:
molecular weight of NaCl molecular weight of Cl
)
= (23 +17 17 = 2 35..

Other useful molecular weights are:

K (potassium): 39
Ca (calcium): 40
Mg (magnesium): 24
Br (bromium): 80

Note that 1g/l = 1000ppm

Conversion from Bottomhole to Surface Conditions

Oil: B o = 1.2–1.6 reservoir barrels/stock tank barrels
Gas: B g = 0.8–1.2 reservoir barrel/scf

Resistivity of Saline Solutions as a Function of Temperature

R w is approximated by:

R w2 = R w1 * ( T 1 + ) ( T 2 + )
k
k
where k = 6.77 when T is in °F and k = 31.5 when T is in °C.

Properties of Some Common Lithologies

Note that U = Pe*r e, where Pe is the photoelectric absorption index as
displayed on a typical log and U is the volumetric photoelectric absortion
index. U is typically used in forward modeling of multimineral models,
since it is independent of porosity.