Case Histories from South America and Africa
Satellite radar can now offer the oil industry an effective, low-cost technique for reducing source risk in high-cost exploration environments such as the ultradeep frontier basins of the South Atlantic margin. This is because of the ability to image surface oil seeps that originate by slow leakage from oil- and gas-filled traps. Multitemporal satellite data over such seeps provide the locations for follow-up surface sampling from which key geochemical information on the reservoired oil can be obtained ahead of the drill.
Satellite seep data over two of the world’s current deep-water hot spots, Angola and Brazil, are analyzed and compared with similar results from one of the seepiest areas of the world, the South Caspian Basin. In the Caspian, multirepeating seepage slicks on satellite radar have significantly extended the limits of the oil kitchen and have underlined the exploration potential of the undrilled deep-water blocks. Results from the prolific Lower Congo Basin off Angola also show an encouraging pattern of dense, repeating oil seepage in the deep- and ultradeep-water play fairways on trend with the recent deep-water oil discoveries of Girassol, Dalia, and others. This contrasts with results from the deep-water Santos Basin, where evidence of active oil seepage, although positive, is more scattered. Results from all three areas are integrated with public-domain subsurface data to provide an explanation of the different seepage styles in the three areas.
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Surface Exploration Case Histories: Applications of Geochemistry, Magnetics, and Remote Sensing provides an overview of successful applications of surface exploration methods. Through a series of independent case histories, this volume presents clearly documented evidence that demonstrates how surface exploration methods can significantly reduce exploration risk and finding costs: geochemical, magnetic, and remote sensing. The 19 chapters in this volume reflect the broad scope of applications for these methods: frontier basin reconnaissance, prospect development, prospect evaluation, and field development and production. The case histories span the globe: 1. North America 2. Africa 3. South America 4. Europe 5. Middle East 6. Australia. This book will interest explorationists and managers who seek to get the most out of each exploration dollar.