--> Abstract: Depositional Model for Deep-Water Miocene Reservoirs in the Jubliee and Spiderman Gas Fields, Eastern Gulf of Mexico, by Todd J. Greene, Peter Gamwell, Todd Butaud, Andrew Pink, Michael Golden, David Jones, James Parr, and Istvan Barany; #90039 (2005)

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Depositional Model for Deep-Water Miocene Reservoirs in the Jubliee and Spiderman Gas Fields, Eastern Gulf of Mexico

Todd J. Greene, Peter Gamwell, Todd Butaud, Andrew Pink, Michael Golden, David Jones, James Parr, and Istvan Barany
Anadarko Petroleum Corporation, The Woodlands, TX

The recent successes of the Jubilee and Spiderman gas fields (Atwater Valley Block 349 and De Soto Canyon Blocks 620 and 621, respectively) in the eastern Gulf of Mexico have considerably helped to lower risk within seismic-amplitude-supported plays when exploring for deep-water Miocene sands. Data collected from whole core of the Spiderman (180 feet) and Jubilee (90 feet) wells have strongly influenced our interpretation of reservoir architecture. At both fields, we infer a basin-floor setting where 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 erosional mass transport complexes along with deeper episodic salt movement also played an important role in the lithofacies distribution for these deposits.

The Spiderman field (total depth of cored well is 17,210 feet true-vertical-depth) is located in 8,100 feet of water. The shallowest interval, termed the MM9 (Middle Miocene) Sequence, contains three interconnected stacked sand bodies that were deposited in a confined, amalgamated, sand-filled, 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 which is then overlain by a channel/levee complex.

The Jubilee field (total depth of cored well is 17,800 feet true-vertical depth) is located in 8,830 feet of water. 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.

In order to best optimize reservoir performance, we have developed detailed facies-based models where petrophysical properties are calibrated to individual facies, and hence we can develop a stochastically-derived geobody volume that predicts reservoir quality and degree of compartmentalization over the entire field.

AAPG Search and Discovery Article #90039©2005 AAPG Calgary, Alberta, June 16-19, 2005