GOR stands for Gas-Oil-Ratio.
It is very common way of expressing amount of gas produced while producing an oil well. Common unit is MSCF/bbl.
Just like we have dissolved gas in a pressurized coke bottle, some amount of gas remains in solution in the crude oil at reservoir conditions. The ratio of dissolved gas or "solution gas" per unit volume of oil is called Solution Gas-Oil-Ratio. It is often denoted by Rs.
However, the well produces not only solution gas, but also some amount of free gas. The total gas produced per unit volume of oil is called Produced Gas-Oil-Ratio and is denoted by Rp.
Mathematically,
Rp = Rs + Free Gas
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