American Oil and Gas Reporter - May 2015 - 67

3-D Seismic Analysis
Characterizes
Niobrara Silo Field
By Elena Finley
and Stephen A. Sonnenberg

GOLDEN, CO.-The Silo Field in the northern Denver Basin in

southeastern Wyoming features a structural monocline in the Niobrara
interval with no apparent structural closure. However, Niobrara oil
production is controlled heavily by the presence of open, vertical natural
fractures, and the genesis of these features is not well understood.

A Permian-age salt edge exists within the field that was believed to be

the cause of faulting and fracturing within the Niobrara formation. The

nature of the salt edge and natural fractures were characterized as part
of a Colorado School of Mines research project by interpreting a 3-D

seismic survey covering approximately 30 square miles in the heart of

the Silo Field. Formation microimaging (FMI) logs and core descriptions

provided additional information for the 3-D seismic characterization.

MAY 2015 67



American Oil and Gas Reporter - May 2015

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