Нефтегазовые нанотехнологии для разработки и эксплуатации месторождений. Часть 2. Евдокимов И.Н - 42 стр.

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incidence of characteristic concentrations in both graphs of

Figure 3. Namely, both dn/dc and absorptivity exhibit a high peak

at ∼2–8 mg/l of asphaltenes (and show a tendency of decreasing at

lower concentrations). Two secondary maxima are observed at

25–30 and at 55–65 mg/l, while above 80–90 mg/l saturation levels

are reached.

Fig. 3. RI increment (left) and optical absorptivity (right)

in dilute solutions of crude #1.

Fig. 4. Optical absorptivity in dilute solutions of crude #2 (1)

and of solid asphaltenes (2).

Moreover, the above characteristic concentrations are close to

those observed in our earlier studies of asphaltene-containing solu-