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The AAPG/Datapages Combined Publications Database
Houston Geological Society Bulletin
Abstract
Abstract: Depositional Model for Deepwater Miocene Reservoirs
in the Jubilee and Spiderman Gas Fields,
Eastern Gulf of Mexico
By
Anadarko Petroleum Corporation
The Woodlands, TX
Accurately predicting how fluid will
flow through the reservoir in order to
characterize the degree of compartmentalization
and to locate the position of flow
baffles and barriers is a critical factor in
making sound economic decisions during
field development. Devising a good reservoir
characterization model for deep-water
sands, as a fundamental framework to a
reservoir simulation model, can improve
our ability to predict how the reservoir will
perform over the life of the field. Defining
the internal geometry of geobodies and relating them to calibrated
rock properties is critical to 3D reservoir characterization.
However, predicting how fluid will flow during production
becomes very challenging for those areas remote from well
control in a field that has sparse
well
penetrations and where the
wells are often spaced thousands of feet apart.
To address this uncertainty, we were able to utilize all available
data, including high-resolution seismic, wireline log
analysis
and
whole core data, to develop a 3D facies-based model that distributes
petrophysical properties (porosity, permeability, water
saturation, shale volume) with statistical ranges of uncertainty
throughout the volume of the field. The model can then be scaled
up to a dynamic scale appropriate for reservoir flow simulation
that will ultimately be calibrated to field production data.
We present the depositional facies model for two newly discovered Miocene-age deep-water gas fields in the eastern Gulf of Mexico: Spiderman and Jubilee Fields, De Soto Canyon (DC) Blocks 620/621 and Atwater Valley (AT) Block 349 respectively (Figure 1). Data collected from 180 feet of whole core from the Spiderman Field and 90 feet of core from the Jubilee Field has strongly influenced interpretation of the reservoir architecture.
At both fields, our team interprets a basinfloor setting, where the stratigraphic architecture reflects the interplay of a variety of deep-water depositional processes, including high-density sandy turbidite flows, suspension deposits, mass transport complexes, low density turbidites and channelized deposits. The irregular sea floor created by Miocene erosional mass
End_Page 23---------------
transport complexes, along with deeper episodic salt movement, also played an important role in the lithofacies distribution of these deposits.
The Spiderman Field (DC 620/621) is located in 8,100 feet of
water. The total depth of the cored well
is 17,210 feet true vertical
depth (TVD). The shallowest interval, termed the MM9 (Middle
Miocene)
sequence
, contains three interconnected, stacked sand
bodies that were deposited in a confined, amalgamated sandfilled
low-relief channel complex. The deepest interval, termed
the MM7
sequence
, also appears interconnected and was deposited
as more unconfined sheets within a frontal splay complex that
was then overlain by a channel/levee complex.
The Jubilee Field (AT 349) is located in 8,830 feet of water. The
total depth of the cored well
is 17,800 feet TVD. Three interconnected
stacked sand bodies, termed the UM1b (Upper Miocene),
were deposited as compensatory stacked, amalgamated and layered
sheets that are overlain by erosive mostly mud-filled
channels.
Acknowledgments
The authors wish to thank Anadarko Petroleum Corporation for allowing us to publish this material. We are grateful to WesternGeco, owners of the seismic data, for permission to present the seismic images. We also wish to thank Spiderman Field partners Dominion Exploration and Production and Spinnaker Exploration for granting permission to release data.
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