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Structurally controlled hydrothermal dolomite reservoir facies: An overview: Reply

¹ Graham Davies Geological Consultants Ltd., Alastair Ross Technology Centre, 3553 31st Street N. W., Calgary, Alberta, Canada, T2L 2K7; gdgc@telus.net
² Reservoir Characterization Group, Room 3140 CEC, New York State Museum, Albany, New York 12230; lsmith@mail.nysed.gov

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We welcome the comments by Friedman (2007) on our review article on structurally controlled hydrothermal dolomite. However, we disagree strongly with many of his comments and conclusions. We find it unfortunate that he repeats the statement of Machel and Lonnee (2002) that the term "hydrothermal dolomite" is confusing and meaningless. Both the Machel and Lonnee (2002) article and the discussion by Friedman show a basic lack of understanding of the process of hydrothermal dolomitization and how common dolomite of structurally controlled hydrothermal origin appears to be worldwide.

Because Friedman (2007) infers that the term hydrothermal dolomite is confusing and meaningless and follows Machel and Lonnee (2002) in considering it a product of poor definition, it is useful to repeat the definition used in our article (Davies and Smith, 2006). We begin first by recognizing the widely acknowledged definition of hydrothermal by White (1957, p. 1638) as "of or pertaining to any water that is appreciably warmer than the surrounding environment." We then expand the definition of structurally controlled hydrothermal dolomitization as "dolomitization occurring under burial conditions of elevated (but commonly transient) temperature and pressure by fluids, typically brines, with temperature and pressure of the fluid higher than the ambient temperature and pressure of the host formation (typically limestone), commonly emplaced peripheral to or along extensional or transtensional faults or fracture systems, but with a strong depositional facies to early diagenetic control on replacement textures and fabrics, and pore type and volume." Although quite long in its expanded form, we fail to see where this definition is confusing or meaningless; it certainly . . . [Full Text of this Article]