Lecture 2 - The Carbon Cycle, Organic Matter and Maturation

Petroleum Geology

TU Delft

1) In this part, the carbon cycle is explained. First, the concepts of organic carbon, inorganic carbon adn phytoplakton are explained since these are crucial for understanding the carbon cycle. After that teh carbon cycle and moreover mass balances that go together with teh carbon cycle are preseneted as well. 2) The development of Flora and Fauna is explained by interpreting and partial pressure of several gases in teh atmosphere. 3) The composition of different biomolecules and their abundance in different organisms is explained. 4) Preservation of organic matter is first explained. It can be seen that source rocks are the main preservation zones, which indicates the low efficiency of the preservation process. The concepts of Total Organic Carbon (TOC) and kerogen as a content of that in source rocks are eludicated. 5) The conversion of kerogen in source rocks to hydrocarbons like oil and natural gas are explained. The "van Krevelen" diagram in used to illustrate this. Several types of maturation indicators, used to evaluate potential source rocks, are discussed.

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