Depositional and diagenetic controls on reservoir rock development and petrophysics in Silurian tidalites, Interlake Formation, Cabin Creek Field area, Montana

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Authors:Roehl, Perry O.
Author Affiliations:Primary:
Trinity Univ., Dep. Geol., San Antonio, TX, United States
Marathon Oil Co., 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.85-105. Publisher: Springer-Verlag, New York, NY, United States. ISBN: 0-387-96012-0
Publication Date:1985
Note:In English. 9 refs.; illus. incl. sect., sketch maps
Summary:The subsurface of Montana, the Dakotas, and the Canadian portion of the Williston basin contains numerous oil reservoirs developed in dolomitized tidalites of Ordovician and Silurian age. Porosity and permeability development in these rocks depends on: 1) initial environment of deposition (including climatic effect) and 2) diagenesis, especially that related to sabkha interludes and associated dolomitization. The control of reservoir development within the constraints imposed by these depositional and diagenetic features is governed by capillarity and by formation fluid properties. A conceptual model portrays: 1) an underlying subtidal and intertidal facies typified by the Stony Mountain formation (Ordovician). This lower facies is composed of mud-dominant, bioturbated carbonates directly overlying a dark, illitic shale-rich, fossiliferous member, the so-called Stony Mountain shale; both of these units are now dolomite; 2) these tidalites pass upward into supratidal deposits of diverse sedimentary fabrics and early post-depositional modifications, including sub-aerial diagenesis and dolomitization. These modified intertidal and supratidal deposits characterize the Interlake formation of Silurian age. [J.M.H.]
Subjects:Carbonate rocks; Controls; Diagenesis; Economic geology; Interlake Formation; Llandovery; Lower Silurian; Paleozoic; Petroleum; Pressure; Reservoir rocks; Sedimentary rocks; Sedimentation; Silurian; Tidalite; Fallon County Montana; Montana; United States; Cabin Creek Field
Abstract Numbers:87M/1629
Record ID:1986002355
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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