Page 280 - Geology and Geochemistry of Oil and Gas

MODELS OF STATIC GEOLOGIC SYSTEMS 243

Fig. 11.18. Variation in heavy-mineral content (solid lines) depending on the contents of rock-forming
minerals (Q – quartz, FS – feldspar, RF – rock fragments). (a) Ore minerals, (b) stable minerals,
(c) kaynite/disthene group, (d) micas.

the influence of ligroin on density may be replaced by a constant value. In this case,
the equation can be written as follows:
g ¼ 0:8707 þ 0:0013R 0:0027B (11.64)
The coefficient of multiple correlation is 0.830. Graphically this relationship is
presented in Fig. 11.21. As shown, the dependence of crude oil density on the content
of resins plus asphaltenes and gasoline, with ligroin influence being excluded, is
clearly expressed graphically and can be used in calculations.
Relationship among the viscosity, density, and temperature of crude oil (changing
simultaneously) has also been studied. In the Absheron oil and gas region depth of
burial of productive reservoirs varies from 500 to 3500 m, whereas the reservoir