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The Leading Edge; July 2001; v. 20; no. 7; p. 718-728; DOI: 10.1190/1.1487283
© 2001 Society of Exploration Geophysicists
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Adapting to noisy 3-D data

Enhancing Algerian giant field development through strategic planning of 3-D seismic in Berkine Basin

Jock Drummond

Anadarko Petroleum Corporation, Houston, Texas, U.S.

Jim Ryan

Target Finders Limited, London, United Kingdom

Rashid Kasmi

Sonatrach, Algeria

Corresponding author: jock_drummond@anadarko.com

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

In 1995, after several successful exploration wells, Anadarko Algeria Corporation and partners (Sonatrach, Lasmo Oil Algeria, and Maersk Olie Algeriet) sought to accelerate development in Berkine Basin (Figure 1) where they had rights to five million acres.


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  		Figure 1. Map of Algeria showing the Berkine Basin and Anadarko JV licensed blocks.

 
Prior to the joint venture's purchase of exploration and development rights, more than 30 000 km of 2-D data had been acquired. These data were of many different vintages with varying acquisition parameters, line lengths, azimuths, and processing flows. The variability in data quality made accurate interpretation of the regional geology very difficult and interpretation of subtle structures and reservoirs almost impossible.

The initial strategy was to reprocess all vintage data in a consistent manner to facilitate regional interpretation. Processing started in September 1990 and finished late in 1992.

After interpreting this regionally consistent data, the group proposed an exploration well in the western portion of block 404. This first well (BKW-1 in Figure 2) was a dry hole. Postmortem analysis caused the exploration team to re-evaluate their approach from both geologic and geophysical standpoints.


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  		Figure 2. Map showing detail of licensed blocks, discovered fields and 3-D surveys acquired to date.

 
It was determined that the team had to formulate a strategy to acquire regional 2-D data. As a result, a new exploration program was instigated with improved acquisition design based on data analysis and field tests. As the exploration program progressed, a new understanding of the regional geology was developed which highlighted prospective areas that would later be the subject of infill acquisition prior to exploration drilling. From 1990 to 1997, approximately 9000 km of high-fold and increased spatial resolution seismic data were acquired. As a result, the first successful discovery well (EME-1) was drilled in the south of . . . [Full Text of this Article]






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