Anwendung der Grassmann'schen Ausdehnungslehre auf die by Rudolf Mehmke

By Rudolf Mehmke

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9868 X 10-12 m2). The figure is reproduced with permission from Luo et al. (1994). limestones at depths greater than 2000 m in some basins, such as in Alberta, is caused at least in part by the greater extent of stylolitization of the limestones, which have a higher Permeability Dolomitization almost invariably involves the reorganization of permeability pathways. Commonly, permeability increases along with porosity, and vice versa. This is documented through studies of examples such as the Upper Devonian Grosmont Formation in eastern Alberta, which hosts a giant heavy-oil reservoir (Luo et al.

Woody et al. (1996) further found that the planar-e dolomites have the highest porosities and permeabilities, the latter caused by well- connected pore systems with low pore to throat size ratios (as indicated by mercury injection curves); in planar-s dolomite the permeabilities do not increase as rapidly with increasing porosity, corresponding to relatively large pore to throat size ratios; and nonplanar dolomites have a statistically insignificant porosity-permeability relationship, whereby the pore systems have a high tortuosity and large pore to throat size ratios (see also Gregg 2004).

Most dolomites that originally form very close to the surface and/or from evaporitic brines tend to recrystallize with time and burial because they form as metastable protodolomite phases and become thermodynamically highly unstable as a result of increasing temperature and pressure, and changing fluid composition. A perhaps typical example is the Monterey Formation, yet there are exceptions, the Dunvegan gas field being particularly striking. By contrast, dolomites that form at several hundred to a few thousand metres depth are either not or hardly prone to recrystallization because they tend to form as rather stable (nearly stoichiometric, well-ordered) phases, the stability of which does not change much during further burial and with increasing time.

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