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c) Невпевненість головним чином базується на
місцеположенні справжньої нафтоматеринської породи.

d) Невпевненість головним чином базується на
місцеположенні нафтоматеринської породи.

VI. Test Your Understanding of the Words:

In line 16 “subsequent” means:

(a) following; (b) former;

(c) prior; (d) antecedent.

VII. Word Choice.

Find the most suitable word to complete the following
sentence:

Migration paths may be:

(a) broad; (b) curved;

(c) narrow; (d) long or short.

Варіант 3.

Opinions differ widely on the state of petroleum during
migration, whether in solution, in colloidal solution, or as a
separate phase in water. Petroleum occurs in solution in formation
waters; it occurs as emulsions in the production processes; and it
occurs as a separate phase in the trap. Each possibility has its
merits and its problems.
Migration in aqueous solution has the merit of requiring
least work for its transport through the rocks. The problems relate
to the quantitative sufficiency of this process in view of the
relatively low solubility of petroleum in water, and the need for
some physical or chemical change to be imposed on the solution
for the release of petroleum to a separate phase in (or on the way