Natural fractures in the AUTHORS John C. Lorenz ϳ Sandia National Spraberry Formation, Midland Laboratories, Department 6116, Mail Stop 0750, Albuquerque, New Mexico, 87185; basin, Texas: The effects of
[email protected] John C. Lorenz is a Distinguished Member of Technical Staff at Sandia National Laboratories, where mechanical stratigraphy on he has worked on sedimentary and natural-fracture reservoir characterization issues. His work has focused fracture variability and on the Rocky Mountain region but has extended to reservoirs in other parts of the world. Lorenz earned a Ph.D. from Princeton University and joined Sandia in reservoir behavior 1981. Previously he was with the Peace Corps, Morocco, and worked for the U.S. Geological Survey. John C. Lorenz, Jenny L. Sterling, David S. Schechter, Jenny L. Sterling ϳ Department of Hydrology, Chris L. Whigham, and Jerry L. Jensen New Mexico Institute of Mining and Technology, Socorro, New Mexico, 87801; current address: Irell & Manella, LLP, Newport Beach, California, 92660;
[email protected] ABSTRACT Jenny L. Sterling is a hydrogeologist who is working as a consultant and assistant for a leading environmental Horizontal cores from sandstone-siltstone reservoirs in the Spra- mediator at Irell & Manella, LLP. Jenny received her berry Formation (Midland basin, west Texas) have documented two master’s degree in hydrogeology from the New systems of dramatically different yet dynamically compatible nat- Mexico Institute of Mining and Technology in 2000, ural fractures, in reservoirs separated vertically by only 145 ft (44 where her thesis work included study of the Spraberry Formation and fracture generation. Prior to her m). Each system is capable of producing a different degree of the employment in the legal field, she worked as an northeast-trending permeability anisotropy recognized in Spraberry environmental consultant at Daniel B.