from same article The bottom line What started as a price change...

from same article

The bottom line
What started as a price change based on demand slipping while supply remained robust took on a more ominous look as global growth projections and stock prices weakened. Finally, the oil price drop slipped into one of those anti-bubble periods, where everything seems to be going wrong, implying more big drops are right around the corner.
The good news is these pessimistic periods usually indicate a bottom. Combined with oil stocks’ now attractive valuations, that makes this a good time to do buy.
But what about the stock market correction?
Yes, it still looks like the stock market could fall further. However, oil stocks sped ahead of this down market. Remember, too, the oils are typically a defensive stock group that investors shift to, not from, in times of trouble. Therefore, the oil stocks could actually outperform the market from here.

And that brings up one more point. In recent years, international strife created worries about oil supply disruption, thereby causing oil prices to rise. This issue could once again provide added impetus to a price rise when today’s decline ends.