Master's Theses

Document Type

Thesis

Date of Award

Fall 2012

Degree Name

Master of Science (MS)

Department

Geosciences

Advisor

Dr. Ken Neuhauser

Abstract

The researched area covers the extent of the Keller 3D seismic survey [2 mi2 (5.2 km2)] and is located approximately 12 miles northeast of the city of Hays, Kansas and NW of Ellis and SW of Rooks counties, Kansas. Eight producing oil wells along with one dry hole are located within the research area. This study is focused on the Cambrian-Ordovician Arbuckle Group which is the principal oil bearing reservoir within the research area and in the region. Interpretation of the Keller 3-D seismic data, well-log correlation and a study and description of the drilling samples suggest that the Arbuckle facies vary within short distances in the research area. Such facies variations create challenges to spot and drill productive intervals within the Arbuckle. The presence or absence of the Arbuckle “reservoir” facies depends on combined factors such as shape of the Precambrian paleotopography, the dolomitization process, the deposition and post-differential erosion processes, and the formation and distribution of paleokarsts and fractures within the unit. Oil accumulations in the Arbuckle Group within the research area seems to be associated to the occurrence of the Arbuckle reservoir (dolomites) with high permeability and porosity (karsts, micro-fractures or microcrystalline) combined with paleo-structures (paleo-highs). 3-D seismic interpretation and seismic attribute analysis of the thickness and attribute maps of the Arbuckle Group suggest that the non-productive well #4 was drilled on the flank (down-deep) of a paleo-high where karst features, fractures or porous dolomites were absent. Analysis suggests that Petroleum System elements such as charge, trap and seal except reservoir have a low risk in the study area. 3-D seismic attribute analysis and a detailed reservoir characterization seem to be the clue to delineate and spot successful future drilling sites.

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Rights

© 2012 Vilma I. Perez de Pottella

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