From One Job to the Next: Worker Adjustment in a Changing Labor Market

The authors discuss how the structure of job opportunities has changed over the last two decades; specifically the transfer of jobs from manufacturing to service industries. They then link these changes to issues of worker displacement policy and worker mobility.https://research.upjohn.org/up_press/1105/thumbnail.jp

Worker Adjustment in Perspective

The authors discuss how the structure of job opportunities has changed over the last two decades; specifically the transfer of jobs from manufacturing to service industries. They then link these changes to issues of worker displacement policy and worker mobility.https://research.upjohn.org/up_press/1105/thumbnail.jp

546 The Leading Edge

The Tempest Project-Addressing challenges in deepwater Gulf of Mexico depth imaging through geologic models and numerical simulation P erforming depth imaging is an essential part of deepwater Gulf of Mexico (GOM) exploration. Over the years, depth-imaging technology has provided the most reliable seismic images below salt and has been implemented in the workfl ows of the prospect generation process. But how accurate are these images? Since model building for depth imaging is partially an interpretative process, and depth imaging involves resolving seismic propagation through complicated geologic features, it is easy for the resulting prestack depth-migrated images to include imaging and positioning errors. Much deepwater GOM exploration focuses on targets beneath the regional allochthonous salt. Due to the complex structural geometries associated with salt tectonics and the geophysical characteristics of salt, the acquired seismic data sets universally include areas of very poor signal. Over the years, improvements in both seismic acquisition techniques and implementation of new imaging algorithms have improved subsalt imaging. However, there are still large areas where the image quality is not suffi cient to generate confi dent interpretations, impacting prospect generation in ways ranging from the ability to estimate value for lease sale acquisition to maturing prospects to drill-ready status ( In order to improve our ability to correctly interpret areas of low illumination and poor signal-to-noise ratio as illustrated in Leveraging the growth of compute power in conjunc- ADAM SEITCHIK, DANA JURICK, ALEX BRIDGE, RICHARD BRIETZKE, and KEN BEENEY, Devon Energy Corporation JEFF CODD, FATMIR HOXHA, CLAUDE PIGNOL, and DAVID KESSLER, SeismicCity Corporation tion with aff ordability, the industry has improved its ability to simulate fi eld-acquired data phenomena such as optimal acquisition geometry, optimal processing fl ows, and selection of prestack depth-migration algorithms. Th is growth in compute power enabled us to move from ray-based numerical simulation to wave-based numerical simulation. As importantly, simulation projects can now be done using appropriate key parameters such as large apertures and high-frequency bandwidth and can be done in a timely manner so their results will be used as part of an exploration project. In order to analyze subsalt depth imaging accuracy and algorithm limitations, Devon Energy, in collaboration with SeismicCity, decided to create a model and a data set that represent true GOM geology. Th e model and data set were given the name "Tempest." Th e key component of the simulation part was to use wave-equation techniques for generating the seismic data. Th e Tempest project was executed in thre