Date of Award

4-1991

Degree Name

Master of Science

Department

Geological and Environmental Sciences

First Advisor

Dr. David A. Barnes

Second Advisor

Dr. William B. Harrison III

Access Setting

Masters Thesis-Open Access

Abstract

The Berea Sandstone has produced in excess of 1.6 million barrels of oil in the Williams field since discovery in 1980. Seven lithofacies are identified from conventional core in the Bedford-Berea sequence. These facies are interpreted as deltaic deposits comprising prodelta (Bedford Shale), delta front, destructive marine shale, abandoned distributary channel-fill, interdistributary bay-fill, transgressive marine sandstone, and marine shale (Sunbury Shale) facies. Passive channel-fill facies truncate reservoir sandstone bodies and compartmentalize the field NW-SE across the trend of the northwestplunging anticline.

The two reservoir facies in the Williams field are the delta front and transgressive marine sandstones. The sandstone framework grain composition is a subfeldsarenite. The reservoir sandstones can be subdivided into reservoir facies with distinct petrologic evolution and reservoir characteristics. Reservoir facies include ripple-laminated, bedded, and "structureless" sandstones. The paragenesis and reservoir quality in each reservoir facies is attributed, mainly, to the presence of ductile detrital material, clay and mica, which templated the diagenesis, including compaction, cementation, and decementation.

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