Oilfield Review Schlumberger
Executive Editor Mark A. Andersen
Advisory Editor Lisa Stewart
Senior Editor Matt Varhaug
Editors Rick von Flatern Vladislav Glyanchenko Tony Smithson Michael James Moody
Contributing Editors Rana Rottenberg Glenda de Luna
Design/Production Herring Design Steve Freeman
Illustration Chris Lockwood Mike Messinger George Stewart
Printing Wetmore Printing Company Curtis Weeks
4 Mining Heat
Geothermal energy is clean and plentiful. However, bringing this resource economically to population centers where the key elements of water and heat do not exist simultaneously will require substantial technological advances. Case histories from the USA and Indonesia illustrate the innovations being explored in an effort to harness this alternative energy source.
14 High-Impact Reservoirs
Asteroid impact can affect local and regional geology, influenc- ing the location and quality of hydrocarbon reservoirs. In some cases, the impact crater may become an isolated basin that develops its own petroleum system. Examples show how aster- oid impact has created unusual petroleum reservoirs and why it is important to consider impact events when prospecting for oil and gas.
N
On the cover:
Technicians at the Schlumberger Sugar Land Technology Center, near Houston, prepare a downhole fluid analysis tool for field delivery. A drawing of the focused-probe assembly appears in the background. These tools enable low- contamination sampling and efficient measurements of near-reservoir fluid properties from a number of test points. Although oil color generally ranges from shades of brown to clear, samples have been found in a variety of colors (photo- graph,inset).
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