Masters Theses

Abstract

"Four potentially productive oil horizons have been identified in the Kimmswick Limestone (Trenton/Galena), Ordovician of southwestern Illinois. Four non-porous caprock zones and four porous horizons were identified and informally named after corresponding members of the Dunleith Formation (Illinois State Geological Survey classification). The porous horizons generally consist of coarse-grained, fossiliferous limestone, which is overlain by finer grained, spar-cemented, impermeable limestone.

In order of production potential, the horizons are the upper Moredock, lower Moredock, Beecher-St. James (lowermost stratigraphic unit), and New London (uppermost stratigraphic unit). Porosity in the upper Moredock horizon is relatively consistent throughout the study area, as determined by examination of 143 well log files (94 with E-logs) from nine oil fields and 98 thin sections. Vertical and lateral porosity variations in the lower horizons are complex. The New London horizon is truncated by the pre-Maquoketa unconformity in the western study area and is consistently permeable when present.

The New London horizon is about three feet thick and lower horizons are each about 20 feet thick. The upper Moredock is the most productive horizon throughout the area. Where the upper Moredock is non-productive the lower horizons are generally non-productive"-Abstract p.ii

Advisor(s)

Alfred C. Spreng

Committee Member(s)

Robert G. Landers
David J. Barr

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology and Geophysics

Publisher

University of Missouri--Rolla

Publication Date

Spring 1985

Pagination

viii, 75 pages

Note about bibliography

Includes bibliographical references (pages 57-59)

Rights

© 1985 Gregory A. Crews, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 5173

Print OCLC #

12234612

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