Gravity and sulfur

I take exception to the article by Karl R. Pavlovic, titled "Gravity and sulfur-based crude valuations more accurate than believed" (OGJ, Nov. 22, 1999, p. 51).Mr. Pavlovic is taking your readers down a dangerous path, one that has been traversed before at considerable expense.In the early 1990s, I worked for a major oil company that had spent millions of dollars on reserves of high-sulfur, low-gravity crude. They were mystified that the crude differentials to West Texas Intermediate (WTI) they had originally assumed when valuing and buying the reserves had not held. The initial margins became much wider, on both an absolute and percentage basis. Suddenly their high-sulfur, low-gravity...

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