Why Occidental Petroleum Stock Plunged 10% Today

The Warren Buffett-owned oil stock's plunge presents an opportunity to buy.Shares of Occidental Petroleum (OXY -9.52%) crashed today and were trading 10% lower as of 12:20 p.m. ET.Ironically, Occidental Petroleum just revealed that it realized higher average prices for oil and gas in its first quarter versus the fourth quarter, which is good news for the company and its investors. Why did the stock then crash today? There are three things to keep in mind.Oil prices are fallingFirst, Occidental Petroleum's w ...