Title

Sedimentology and dolomitization in the upper Mississippian Turner Valley carbonates, Quirk Creek, Alberta, Canada.

Date of Award

1993

Degree Type

Thesis

Degree Name

M.Sc.

Department

Civil and Environmental Engineering

First Advisor

Al-Aasm, I. S.

Keywords

Geology.

Rights

CC BY-NC-ND 4.0

Abstract

The Mississippian Turner Valley Formation at the Quirk Creek field is composed of a shallowing-upward sequence of shallow platform to restricted lagoon and sabkha carbonates with a thickness of 115 m. Major diagenetic events include: cementation, compaction, silicification, anhydritization, and dolomitization. The most important of all diagenetic events involves a continuous spectrum of early to late dolomitization. Four types or generations of dolomite are identified: microdolomite, patchy dolomite, pervasive matrix dolomite and coarse dolomite. Microdolomite (4-10 $\mu$m) is dense, and locally occurs only in sabkha lithofacies. Patchy dolomite (20 to 200 $\mu$m) floats between skeletal grains, and is distributed along dissolution seams and early stylolites $(\delta\sp{18}$O, $-$0.79 to $-$3.52 per mil PDB). Pervasive matrix dolomite or masssive dolomite (20 to 300 $\mu$m) is the most abundant type of dolomite with predominantly reservoir porosity. Megadolomite (0.5 to 2 mm) consists of coarse, euhedral rhombs and moldic-dolomite. It replaces massive dolomite and crosscuts late stylolites. Megadolomite has higher Fe, Mn, and radiogenic Sr (0.70836 to 0.70875) and lowest $\delta\sp{18}$O $(-$2.12 to $-$6.47 per mil PDB), suggesting formation in a later and deeper burial environment. The reservoir porosity of the Turner Valley Formation is mainly controlled by the degree of dolomitization. The most abundant porosity is presented in carbonates with a dolomite component of 70% to 95%. The potential reserves could be found in these carbonates. (Abstract shortened by UMI.)Dept. of Geology and Geological Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1993 .L844. Source: Masters Abstracts International, Volume: 32-02, page: 0568. Adviser: I. S. Al-Aasm. Thesis (M.Sc.)--University of Windsor (Canada), 1993.