Нефтегазовые нанотехнологии для разработки и эксплуатации месторождений. Часть 2. Евдокимов И.Н - 43 стр.

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tions. As an example, Figure 4 shows the behavior of absorptivity

at 670 nm in toluene solutions of crude oil #2 (lower curve) and of

solid asphaltenes (upper curve). The data are adapted from

Evdokimov et al., 2003b.

Interrelationship between optical absorption and refractive

index is implied in well-known Kramers–Kronig (K–K) equations.

However, this interrelationship is not immediately proved by simi-

larity of the dependencies in Figure 3, measured at fixed wave-

lengths. The exact K–K formula (Sheik-Bahae, 2004) requires the

knowledge of absorptivity κ in the entire range of wave frequen-

cies :

∫

∞

−

)(

1)(

(3)

Fig. 5. UV/Vis absorptivity spectra in highly diluted (1)

and more concentrated (2) oil solutions.

Figure 5 shows some preliminary experimental data on

UV/Vis absorptivity spectra in solutions of crude oil #1, measured

at asphaltene concentrations of 3.7 mg/l (curve 1) and >320 mg/l

(curve 2). It is clearly seen that a transition from associated to de-

aggregated asphaltenes is accompanied by an emergence of a

strong resonance band, peaked at

∼285 nm.