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Water is important, of course, as a natural resource when it
is relatively free of dissolved solids. For the geologist, though, the
role of water in the rocks is of fundamental importance, equal to
that of the solid constituents. For the petroleum geologist, it could
almost e said to be more important than the solids because of its
association with petroleum. Geology that ignores the water in the
rocks is largely meaningless: one can describe rocks without
considering their water, but one cannot understand them.
All water in the rocks contains some dissolved solids.
These solids, in terms of their dissociated ions, are actions and
anions. There is a long list of minor constituents that includes iron,
aluminium, boron, fluoride, copper, silver, tin and vanadium (the
last also occurs in oil shales and in association with petroleum).

І. Choosing the Correct Definition for a Context:

st
According to the 1 sentence water is:

a) the most common fluid in pore spaces in sedimentary
rocks in the subsurface;
b) rather rare fluid in dense rocks;
c) solid matter in sedimentary basins;
d) the most common fluid found in oil traps.

II. Test Your Understanding of the Words:

“solid” in line 11 passage 2 means:

(a) hollow; (b) firm;

(c) soft; (d) elastic.

III. Comprehension Quiz.

Water is found in:
a) in older rocks;
b) within a few metres of the surface;
c) in sedimentary basins;
d) deep under the surface.