GEOLOGY

Detailed explanation-1: -Effective source rocks are sedimentary rocks, which have already generated and expelled hydrocarbons.

Detailed explanation-2: -S1 = the amount of free hydrocarbons (gas and oil) in the sample. S2 = the amount of hydrocarbons generated through thermal cracking of nonvolatile organic matter.

Detailed explanation-3: -Source rocks are usually shales or limestones (sedimentary rocks). To be a productive source rock, the rock needs time to mature (time to form the oil and/or gas) and the hydrocarbons need to be able to migrate to a reservoir or seep.

Detailed explanation-4: -Petroleum generating source rocks can be lacustrine, marine shale, marine carbonate or terrigenous/coaly, generally corresponding to Type I, Type II, Type II-S and Type III kerogen based on source rock screening data (Rock-Eval pyrolysis and TOC determination) plotted in modified van Krevelen diagrams.