I think your math is too optimistic.
14,000 barrels would be a square of 118 barrels by 118 barrels.
A 42 gallon barrel is more than one foot in diameter, and at least 3 feet high.
That would be at least a quarter acre - and three feet deep.
According to the conversion calculator that I clicked on, 14,000 barrels is 1669366.594 litres. That’s 1669.366594 cubic metre.
I do see my error now.
1669.366594 cubic metres is 58953.13 cubic feet.
Assuming a 4” puddle, that leaves a sq footage of 176859.4 sqft.
That’s about 420ft by 420 feet.
About 36 times larger than my original estimate. It’s still hardly a disaster, imo. It still can be cleaned up almost as fast.