A small group of U.S. oil producers has been trying to exploit advances in DNA science to wring more crude from shale rock, as the domestic energy industry keeps pushing relentlessly to cut costs and compete with the world's top exporters. Shale producers have slashed production costs as much as 50% over two years, waging a price war with the Organization of the Petroleum Exporting Countries (OPEC). Now, U.S. shale producers can compete in a $50-per-barrel oil market, and about a dozen shale companies are seeking to cut costs further by analyzing DNA samples extracted from oil wells to identify promising spots to drill. The technique involves testing DNA extracts from microbes found in rock samples and comparing them to DNA extracted from oil. Similarities or differences can pinpoint areas with the biggest potential. 

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