Organic geochemistry is the main guide for petroleum explorations. I think that it will continue to be an indispensable working principle with accurate interpretations, which are used together with all other research methods.
Organic geochemistry is the first key element to describe and define a target for petroleum exploration. It is indispensable to link the different organic compounds to the various source rocks and to the paleo-environment of deposition. It is and will be an important research method for petroleum exploration.
Organic geochemistry is one of the tools used in the latter stages of petroleum exploration in conjunction with geophysics (areal and downhole), remote sensing, a rigorous field program, drilling, sampling and the like. It would be used in the final stages of the program on samples collected in the field to determine if a site is suitable for development as a petroleum reservoir.
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Another question. What is the first step in the petroleum exploration: Which are the main geological process wich are needed for a good oil territory.... If you know the respons to these question in three words, I am sure that you know where is the most easy place to find natural gas-Petroleum in your country without any other information...