Hopefully scientists will discover the microbes that create oil and oil will become a renewable, low cost, high quality energy source.
Microbes more likely than not live off the oil/methane rather than create it. The degree of light rotation in petroleum is too little for it to be product of biogenesis; however, it's just about right if the oil were of abiogenic origin and contaminated by bacteria. For a good summary of the abiogenesis versus biogenesis points go to
The Origin of Methane (and Oil) in the Crust of the Earth by Thomas Gold, U.S.G.S. Professional Paper 1570, The Future of Energy Gases, 1993.
Thank you for the very informative link.