The current geochemical view is that hydrocarbons generated from organic matter disseminated in fine-grained sedimentary rocks and coals are controlled primarily by temperature and duration of heating ...

While conventional natural gas streams from the earth relatively easily, unconventional gas finds are more difficult to develop and more costly to produce. As technologies and skills improve, ...

Preface -- Abstract -- Introduction and background. Basic geology. Geologic framework ; Geologic structure ; Formation of black shale ; Marcellus boundaries -- Petroleum and natural gas formation.