This book is a companion to "Natural Gas Hydrate in Oceanic and
Permafrost Environments" (Max, 2000, 2003), which is the first book on
gas hydrate in this series. Although other gases can naturally form
clathrate hydrates (referred to after as 'hydrate'), we are concerned
here only with hydrocarbon gases that form hydrates. The most important
of these natural gases is methane. Whereas the first book is a general
introduction to the subject of natural gas hydrate, this book focuses on
the geology and geochemical controls of gas hydrate development and on
gas extraction from naturally occurring hydrocarbon hydrates. This is
the first broad treatment of gas hydrate as a natural resource within an
economic geological framework. This book is written mainly to stand
alone for brevity and to minimize duplication. Information in Max (2000;
2003) should also be consulted for completeness. Hydrate is a type of
clathrate (Sloan, 1998) that is formed from a cage structure of water
molecules in which gas molecules occupying void sites within the cages
stabilize the structure through van der Waals or hydrogen bonding.