Note: Click here to view the charts associated with this article.Organic-rich mudrocks that we tend to think of as the source rocks for conventional hydrocarbon accumulations can also play host to a variety of less conventional deposits. At shallow depths when still immature, organic shales may contain biogenic gas accumulations or their organic matter (kerogen) can be converted to synthetic shale oil by thermal methods. At higher temperatures within the oil window, both liquids and gas are generated, the relative proportions depending on the type of organic matter preserved in ...