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GEOREF RECORD

Porosity controls on secondary recovery at the Loudon Field, south-central Illinois

John S. Wagle, David H. Malone, Eric W. Peterson and Lisa M. Tranel
Porosity controls on secondary recovery at the Loudon Field, south-central Illinois
Interpretation (Tulsa) (February 2016) 4 (1): T1-T13

Abstract

Waterflooding has been used as an effective means to enhance oil recovery in mature oil fields for decades. The success of waterflooding is a function of geology, facies changes, and fluid dynamics, specifically, formation porosity and permeability. Within the Loudon oil field (Illinois), waterflooding has been used to increase production, but the degree of success has been variable. We have used 3D facies modeling was evaluate the variables controlling the success or failure of waterflooding. Three leases within the Loudon field exhibiting varying degrees of waterflood success were investigated. The K. Stubblefield lease, with the highest mean porosity of 13.5%, responded most favorably to waterflooding, with an increase of more than 750 bbl/month. Thick, high-porosity zones are well connected within the lease area, contributing to greater communication among the injection wells and the producing wells. The Rhodes-Williams lease, with porosity of 11.5%, had an increase in production of 350 bbl/month. The model showed that within this lease area, high-porosity zones were either orientated in directions that provided flow away from production wells or were lower porosity zones that finger with higher porosity zones restricting flow. The George Durbin lease, with porosity of 11.5%, produced only an additional 50 bbl/month. The model suggests that injector wells may be positioned in low-porosity zones and, as with the Rhodes-Williams lease, the alignment and distribution of the low porosities inhibit recovery within the producing wells. The 3D models indicated that although porosity plays an important role in the success of waterflooding, the alignment and distribution of the high- and low-porosity zones play a greater role in the success of secondary recovery techniques. Our research also demonstrated the utility and workflow of digitizing older paper well logs to incorporate into modern modeling software.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 4
Serial Issue: 1
Title: Porosity controls on secondary recovery at the Loudon Field, south-central Illinois
Affiliation: Illinois State University, Department of Geography-Geology, Normal, IL, United States
Pages: T1-T13
Published: 201602
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 22
Accession Number: 2016-007637
Categories: Economic geology, geology of energy sources
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. block diags., strat. col., sketch maps
N38°45'00" - N39°12'00", W89°15'00" - W88°42'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 201604
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