I believe the oil and coal is the buried plant remains from Noah’s flood. The flood was more than just 40 days and nights of rain as it says in Genesis 7:11 ‘the fountains of the great deep were opened’. Dr. Walt Brown PhD surmises that this water was 10 miles deep and the water reached super critical pressure/temp where 1 pint of water equals 1 stick of dynamite.
This is the crux of his hydroplate theory decribed in great deatil [including predictions] with his online book. Part I is what we know / don’t know regarding evolution, part II hydroplate theory and supporting evidence, part III commonly asked questions and answers. I purchased the 8th edition hardback copy for $30 ~ it is the most comprehensive treatment of the subject of science and origins I’ve ever encountered.
Center for Scientific Creation - In the Beginning: Compelling Evidence for Creation and the Flood
http://www.creationscience.com/onlinebook/IntheBeginningTOC.html
/johnny