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Dravis
Interests, Inc.
CARBONATE STRATIGRAPHIC APPROACHES & STRATEGIES FOR EXPLORATION AND RESERVOIR DEVELOPMENT
Date TBA - WHERE: University of Houston Hilton Hotel, Houston, Texas.
INSTRUCTOR: JEFFREY J. DRAVIS
Contents
Purpose
and GoalAfter this seminar, each delegate will become familiar
with the various approaches used today to delineate the internal stratigraphy
of carbonate sequences, and the implications for exploration and development
geology. Each participant will learn how established principles of
carbonate sedimentology and diagenesis must be integrated with well
log and seismic data to produce viable models for exploration and reservoir
zonation. Several case studies will show the advantages and economic
benefits of employing strategies developed by western Canadian geologists,
who termed their approach
"Actualistic Carbonate Sequence Stratigraphy."
Versions of this seminar have been presented to industry 13 times.
Who Should AttendGeologists, Geophysicists,
Reservoir Engineers, Managers.
Seminar DescriptionIt
is now well recognized that carbonate depositional sequences
are comprised of finer-scale depositional packages which often
must be delineated for successful exploration, or enhanced
development of existing reservoirs. What many in industry may
not appreciate is that two sequence stratigraphic approaches
exist, each with different roots and methodologies. This seminar
explores the historical development of the two major carbonate
sequence stratigraphic approaches, discusses their models and
inherent limitations, and reviews petroleum case studies showing
which approach is most effective. Each participant will gain
an appreciation of the major controls on the stratigraphic
evolution of carbonate sequences and their stacking geometries
through time, in addition to developing a better scale perspective.
This knowledge is essential for construction of accurate, more
sophisticated, computer-generated 3-D reservoir models.
Two fundamentally-different carbonate sequence stratigraphic approaches evolved
in the early 1980's. One approach, now commonly referred to as the "systems
tracts model," is rooted in seismic stratigraphy and applies a "top-down" approach
by using larger-scale relationships, often based on seismic data, to predict
finer-scale geological relationships. The age of a particular sequence, inferred
sea level changes, and seismic geometries, are key elements of this approach
and define various systems tracts (lowstand, transgressive, early and late
highstand). Play development is often tied back to sequence boundaries or
other major surfaces.
The second approach, referred to as "Actualistic Carbonate Sequence
Stratigraphy," utilizes "bottom-up" geology. Rock-based observations
delineate facies and reservoir quality and are tied to wireline log, seismic
(2-D and 3-D), and engineering data to build more accurate facies-stratigraphic
models for exploration and development geology projects. By superimposing
the distribution of reservoir quality onto this stratigraphic-facies framework,
play relationships become strikingly apparent. This approach utilizes very
little jargon.
Historically, Actualistic Carbonate Sequence Stratigraphy has been applied
most successfully to developing and exploiting existing carbonate reservoirs.
In western Canada, the first reservoir zoned using this approach was the
Devonian Judy Creek limestone reservoir (>900 MMBOIP). Later, Redwater
(1.2 BBOIP), Snipe Lake (350 MMBOIP) and Norman Wells (600 MMBOIP), all Devonian
limestone reservoirs, were effectively zoned for waterflood and enhanced
recovery using the same approach. This methodology also was successfully
applied to highly altered, Devonian dolomite reservoirs in the Rainbow basin
of NW Alberta, where production rates were increased from 500 m3/day to 1400
m3/day.
In order to discuss and contrast the two sequence stratigraphic approaches,
basic and established relationships in carbonate geology are presented during
the first part of this seminar. Then, the two approaches are reviewed and
evaluated. Several petroleum case studies, and the tangible economic benefits
which resulted, are discussed as well. Exercises are integrated throughout
the seminar to reinforce principles and teach the methodology.
Seminar FormatThis
two and one-half day seminar covers: Introduction and Historical
Perspective; Depositional Controls on Stratigraphy [exercise];
Carbonate Diagenesis and Porosity Evolution Related to Stratigraphy;
Carbonate Sequences and Cyclicity - Review of Established Principles;
Evaluation of the Systems Tracts Approach [exercise]; Comments
on Cyclostratigraphy; "Actualistic Carbonate Sequence
Stratigraphy:" Applications to Exploration [exercise];
Applications to Reservoir Zonation and Development, with review
of limestone and dolomite case studies [exercise]; Summary
Comments (including what to do in a frontier basin with limited
data).
InstructorJeff Dravis is
a technical consultant with over 25 years of experience who
applies carbonate sedimentology to exploration and development
geology projects. He has an unique perspective on the subject
of sequence stratigraphy. He was at Exxon's research lab when
the systems tracts models for clastics and carbonates were
being developed and, in fact, conducted research designed to
test the carbonate model. At the same time, he worked closely
with colleagues from Esso Resources Canada in applying Actualistic
Carbonate Sequence Stratigraphy to Devonian reservoirs in western
Canada. Since 1987, Jeff has presented over 100 applied carbonate
in-house and field seminars to industry, as well as conducting
numerous foreign and domestic consulting projects, including
the stratigraphic zonation of several carbonate reservoirs.
Cost: TBA
Enrollment ProceduresComplete
the registration form below and return with fee payable on
U.S. Dollar Account to: Dravis Interests, Inc., 4133 Tennyson,
Houston, Texas 77005
Refund Policy
A full refund,
less the nonrefundable registration fee ($100), will be given if written
cancellation is received by ____. No refunds will be issued after ____.
Substitutions are allowed. Phone/FAX (713) 667-9844 for more information,
or e-mail: jdravi@rice.edu.
Comments From Past
Participants
"Excellent critique of the confusing state of the present science of sequence
stratigraphy."
"Very good overview of carbonate deposition and critique of sequence stratigraphy."
"Every reservoir-related engineer needs to hear this if only to get a
feel for the terminology."
"You should attend this course and learn why core and other geological
data are important to a proper interpretation and development plan."
"Emphasized the importance of looking at the rocks."
"Good summary on exploration for carbonates and discussion of tools and
techniques to use...great practical information."
"High quality, well planned and executed (short course). Good bibliography
and course notebook."
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CARBONATE STRATIGRAPHIC APPROACHES
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MAKE CHECKS PAYABLE TO:
DRAVIS INTERESTS, INC., 4133 TENNYSON, HOUSTON, TEXAS 77005
Dravis Interests and Dravis Geological Services can be contacted by email, by phone at (713) 667-9844, or by mail at 4133 Tennyson St., Houston, Tx 77005-2749.