American Oil and Gas Reporter - February 2016 - 55

Historical Bakken Test Data

Provide
Critical Insights
On EOR In
Tight Oil Plays
By James A. Sorensen and John A. Hamling
GRAND FORKS, N.D.-Total in-place oil estimates for the Bakken petroleum system
(including the Three Forks formation) range from 160 billion to more than 900
billion barrels. However, Bakken/Three Forks horizontal wells have decline rates as
high as 85 percent over the first three years of their lives, and primary recovery
factors typically range from 3 to 10 percent of original oil in place.
Consequently, the U.S. Geological Survey estimates that the Bakken petroleum
system contains 7.4 billion barrels of undiscovered, technically recoverable oil. While
obviously a tremendous endowment of recoverable reserves, 7.4 billion barrels
represents a fraction of the estimated in-place resource.
Given the low initial recovery rates in these ultralow-permeability unconventional
formations, incremental productivity improvements could dramatically increase
technically recoverable oil in the Bakken/Three Forks. One potential solution is
carbon dioxide enhanced oil recovery injection. While common in conventional
reservoirs in the Rocky Mountains and areas such as West Texas, CO2 EOR in
unconventional tight oil reservoirs is a relatively new concept. If successful, largescale CO2 injection into the Bakken petroleum system could not only dramatically
increase oil productivity and recovery factors, but also result in the geological storage
of significant amounts of carbon dioxide.

FEBRUARY 2016 55



American Oil and Gas Reporter - February 2016

Table of Contents for the Digital Edition of American Oil and Gas Reporter - February 2016

Contents
American Oil and Gas Reporter - February 2016 - Cover1
American Oil and Gas Reporter - February 2016 - Cover2
American Oil and Gas Reporter - February 2016 - Contents
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