is the study of absolute and relative abundance of the elements of land and both physical and chemical processes that have occurred, and distribution. Geochemical studies involve the analysis of samples collected both in the exploratory phase and later during drilling to determine the type and degree of alteration of organic matter in rocks and track the presence of hydrocarbons.
Source:
http://www.lexicool.com/dr.asp?ID=NL2OG99088
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