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The Leading Edge; April 2001; v. 20; no. 4; p. 429-434; DOI: 10.1190/1.1438968
© 2001 Society of Exploration Geophysicists
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Rock physics and AVO analysis for lithofacies and pore fluid prediction in a North Sea oil field

Per Avseth, Tapan Mukerji and Gary Mavko

Stanford University, Stanford, California, U.S.

Jorunn Aune Tyssekvam

Norsk Hydro ASA, Oslo, Norway

Corresponding author: P. Avseth, per.avseth@hydro.com

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

This paper shows how we can combine statistical rock physics, lithofacies interpretation, and AVO analysis to discriminate between lithologies and thereby improve detectability of hydrocarbons from seismic amplitudes in Grane Field, North Sea. This Late Paleocene turbidite oil field has been problematic because of complex sand distribution and nonreservoir seismic anomalies. Figure 1 is a 3-D visualization of the reservoir as delineated by conventional seismic interpretation. The reservoir is bounded by the Top Heimdal and Base Heimdal horizons. The figure includes seismic grids of the Top Chalk horizon and the overlying Base Balder Formation, which define the Late Paleocene target interval. Also shown are five wells, three of which (1, 2, and 3) penetrate reservoir sands. Wells 4 and 5 targeted possible satellite sands. However, neither encountered reservoir sands. This paper focuses on three 2-D seismic lines that intersect wells 1, 3, and 4 (Figure 2).


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  		Figure 1. 3-D map (traveltime) of Grane Field.

 

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  		Figure 2. Map of Grane Field. The reservoir extent is based on conventional seismic interpretation. Black lines indicate 2-D seismic lines considered in this article. They intersect well 1, well 3, and well 4. (Color represents traveltime depth. Red and yellow are relatively shallow compared with green and blue.)

 
The sands of interest represent the Paleocene Heimdal Formation. The study area, on the eastern margin of the South Viking Graben, is complex in terms of lithology variation. In addition to sands and shales, carbonates and volcanic ash-fall deposits are relatively abundant. This is related to the particular setting and the local basin topography during deposition. Grane Field is on the eastern flank of the South Viking Graben, near the Utsira High, which had abundant limestone and marl deposition during Late Cretaceous and Early Paleocene, as siliciclastic sedimentation rates were low. The complete Heimdal sequence is relatively thin (less . . . [Full Text of this Article]




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