Factors controlling porosity in dolomite reservoirs of the Ordovician Red River Formation, Cabin Creek Field, Montana

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Authors:Ruzyla, Kenneth; Friedman, Gerald M.
Author Affiliations:Primary:
Exxon Prod. Res. Co., Houston, TX, United States
Marathon Oil Co., United States
Rensselaer Polytech. Inst., Dep. Geol., United States
Volume Title:Carbonate petroleum reservoirs
Volume Authors:Roehl, Perry O., editor; Ginsburg, R. N., editor; Choquette, Philip W.
Source:Carbonate petroleum reservoirs, edited by Perry O. Roehl and Philip W. Choquette, p.39-58. Publisher: Springer-Verlag, New York, NY, United States. ISBN: 0-387-96012-0
Publication Date:1985
Note:In English. 22 refs.; illus. incl. 2 tables, sects., strat. cols., sketch maps
Summary:Upper Red River carbonate peritidal sequences at Cabin Creek field were deposited on a broad shallow-marine carbonate bank under arid conditions. Average reservoir zone porosity is 13%, maximum is 33%. Porosity developed in several stages and was controlled by depositional environments, dolomitization on evaporitic sabkhas, and post-depositional leaching by meteoric waters of evaporitic sulphate minerals and undolomitized CaCO3 grains to create moldic and vug porosity. Sulphate-rich brines caused local reprecipitation of calcium sulphate as a cement. Parts of the subtidal zone were cemented by secondary SiO2. These stages of porosity development and cementation were repeated during each of three main depositional cycles. Transgression of each successive supratidal surface renewed the sedimentation, followed in turn by renewed dolomitization, fresh-water leaching, and development of additional secondary porosity. Each cycle has a different set of porosity and permeability characeristics. [J.M.H.]
Subjects:Carbonate rocks; Controls; Dolostone; Economic geology; Ordovician; Paleozoic; Petroleum; Porosity; Production; Red River Formation; Reservoir rocks; Sedimentary rocks; Upper Ordovician; Fallon County Montana; Montana; United States; Cabin Creek Field
Abstract Numbers:87M/1626
Record ID:1986002352
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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