Abstract
There are many factors affecting underground water chemistry of an oil-bearing sedimentary basin. The properties of underground water show variations in the vertical direction, giving rise to a vertical zonation with respect to underground water chemistry. Five zones could be divided downwards, including 1) the freshening zone due to meteoric water leaching (A); 2) the evaporation-concentration zone near the surface (B); 3) the freshening zone due to stratum compaction-released water(C1)—infiltration-concentration zone during the mudstone compaction and water releasing (C2); 4) the freshening zone for clay mineral dehydration (D); and 5) the seepage-concentration zone (E).
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