Petroleum Refinery Engineering
The order of preference for feedstock to a catalytic reformer is

Coking naphtha - virgin naphtha - catalytic naphtha
Virgin naphtha - coking naphtha - catalytic naphtha
Catalytic naphtha - coking naphtha - virgin naphtha
Virgin naphtha - catalytic naphtha - coking naphtha

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Petroleum Refinery Engineering
Petroleum deposits are detected by the.

All of these
Measuremet of density, elasticity and magnetic & electric properties of the rock in the crust of the earth
Age & nature of rocks inside the crust of the earth
Oil seepage at the surface of the earth

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