Interesting Facts

Did you know that the quality of a crude can change over time? Crude variation can occur when new fields are commingled with existing grades or when fields are shut down, thus changing the crude composition.

The graph below shows a Middle Eastern crude oil decreasing in API over time. Interestingly, this is also one of the crude grades that exhibits a seasonality difference. Consistent with seasonal changes, notice the cyclic nature of the API gravity data for this particular crude oil.

November 2000

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