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The Leading Edge; September 2000; v. 19; no. 9; p. 952-962; DOI: 10.1190/1.1438764
© 2000 Society of Exploration Geophysicists
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Seismic attribute and sequence stratigraphic integration methods for resolving reservoir geometry in San Jorge Basin, Argentina

Lesli J. Wood

Amoco Corporation, Houston, Texas, U.S.

Daniel Pecuch and Ben Schulein

Pan American Energy, Buenos Aires, Argentina

Mike Helton

BP Amoco, Houston, Texas, U.S.

Corresponding author: lesli.wood@beg.utexas.edu; 1-512-471-0328

The first 20% of the full text of this article appears below.

Seismic attribute analysis and interpretation have revolutionized the way geoscientists look at and interpret seismic data. Coherency processing, because of its edge-detection capabilities, has greatly improved the explorationist's ability to rapidly map structural frameworks and interpret details that are typically unrecognized in conventional amplitude data sets. However, this technology has been underutilized to resolve stratigraphic and depositional geometry of seismic features. The complexity of many seismically imaged fluvial depositional systems is a product of numerous sources, including geologic heterogenity of deposits, random noise in the data, surface or ocean bottom features, and structural discontinuities. Clear methodology for resolving these complexities is needed if attributes are to properly image, and geoscientists are to accurately interpret, stratigraphic features in seismic data. This paper documents a case study from fluvially deposited stratigraphic units in the San Jorge Basin in Argentina. We integrated sequence stratigraphic interpretation of key stratal surfaces and seismic attributes to reduce reservoir uncertainty in exploration and development wells.


   Regional setting and goals of 3-D acquisition
 
San Jorge Basin, one of the most important hydrocarbon-producing basins in Argentina, is estimated to contain more than four billion barrels of ultimately recoverable oil. The Cerro Dragón block (Figure 1) has produced oil since 1958. About 3000 wells have been drilled in the block on a 350-m spacing. At present, 60–100 development wells are drilled each year.


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  		Figure 1. Location of Huetel Field, Cerro Dragón block, and San Jorge Basin.

 
Hydrocarbon reserves in the block are contained in an extremely heterogeneous fluvial system, which resulted in mixed success rates for development programs over the years. Because some reservoirs are only productive in certain areas of the field, missing specific units can result in complete failure of a development well.

About 110 km2, encompassing Huetel Field, of 3-D seismic data were acquired in the western portion of Cerro Dragón block. The . . . [Full Text of this Article]






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