American Oil and Gas Reporter - January 2015 - 159
By S. Alireza Haghighat,
Shahab D. Mohaghegh,
Vida Gholami
and David Moreno
MORGANTOWN, W.V.-Conventional
tools and techniques used to analyze unconventional resources include decline curve analysis, type curve matching, and in the case of
more prolific assets, reservoir simulation. However, these methods are not completely successful
because of the simple fact that fluid flow in
unconventional reservoirs does not follow the
same physical principles that support conventional analytical and numerical methods.
Consequently, an innovative top-down
modeling (TDM) methodology has been
developed to more accurately simulate unconventional resources. While being completely data driven, TDM is unlike approaches
such as capacitance resistance modeling,
which oversimplifies the complexities of fluid
flow in porous media and ignores the geology
of the asset. TDM is conditioned to any and
all field measurements (drilling data, well
logs, cores, well tests, production history, etc.)
to build comprehensive, full-field reservoir
models. The results of comprehensive production analysis by TDM can provide insightful guidelines for improved field development planning and decision making.
The TDM approach was used to analyze
an area in the Wattenberg Field in Weld
County, Co., producing from the Niobrara
formation using publicly available data. The
TDM was built using data from more than
145 wells. Well logs, production history, well
design parameters and dynamic production
constraints were the main data attributes
used to perform the data-driven analysis.
The workflow for TDM includes generating
a high-level geological model, followed by
reservoir delineation based on regional productivity, reserve and recovery estimation,
fieldwide pattern recognition (based on fuzzy
set theory), key performance indicator (KPI)
analysis (which estimates the degree of influence
that each parameter has on field production),
history matching the production data from
individual wells, and production forecasting.
JANUARY 2015 159
American Oil and Gas Reporter - January 2015
Table of Contents for the Digital Edition of American Oil and Gas Reporter - January 2015
Contents
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American Oil and Gas Reporter - January 2015 - Cover3
American Oil and Gas Reporter - January 2015 - Cover4
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