Welcome to Petroleum Geology Forums

This is a free online community that aims to bring petroleum professionals and geologists together and share valuable knowledge. Registration is easy so become a member now for instant free access.
  • Petroleum Geologists can stay up to date with industry related topics and exchange ideas and concepts.
  • Upstream Oil and Gas Consultants get a chance to share their expertise and gain exposure to land future projects.
  • Geology students and graduates can join the discussion and get into contact with potential future employees.

  >> Register Now





Post new topic Reply to topic  [ 1 post ] 
Illumination properties and imaging promises of... 
Author Message

Joined: Fri Mar 11, 2011 9:00 pm
Posts: 14670
Post Illumination properties and imaging promises of...
Geophysical Prospecting: Illumination properties and imaging promises of blended, multiple‐scattering seismic data: a tutorial

In traditional seismic surveys the firing time between shots is such that the shot records do not interfere in time. In the concept of blended acquisition, however, shot records do overlap, allowing denser source sampling and wider azimuths in an economic way. A denser shot sampling and wider azimuths make that each subsurface gridpoint is illuminated from a larger number of angles and will therefore improve the image quality in terms of signal‐to‐noise ratio and spatial resolution. In this tutorial, we show that, even with very simple blending parameters like time delays, the incident wavefield at a specific subsurface gridpoint represents a dispersed time series with a complex code. For shot record migration purposes, this time series should be designed such that it facilitates a stable inversion process. In a next step, we explain how the illumination property of the incident wavefield can be further improved by utilizing the surface‐related multiples. This means that these multiples can be exploited to improve the incident wavefield by filling angle gaps in the illumination and/or by extending the range of angles (‘natural blending’). In this way the energy contained in the multiples now contributes to the image, rather than decreasing its quality. One remarkable consequence of this property is that the benefits to be obtained from the improved illumination depend on the detector locations in acquisition geometries as well. We explain how to quantify the contribution of the blended surface multiples to the incident wavefield for a blended source configuration. In addition, we explain how blended measurements can be directly used in an angle‐dependent migration process with a bifocal, least‐squares imaging condition. The result is a densely sampled reflectivity function in the ray parameter domain, also improving the capability of velocity estimation. We will show examples to illustrate the theory.

Go to Article


Wed May 23, 2012 4:45 pm
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 





Search for:
Jump to:  


Content on EPGeology.com is intended for personal use only and to supplement, not replace, professional judgment. EPGeology.com disclaims any and all liability for your use of its content. As most of our content is supplied by our users we can not check copyright, and stress that copyright remains at the original owner. If you suspect copyright infringement please use the contact form to report it.
Contact || © EPGeology.com. || Powered by phpBB Asteroid Mining

phpBB SEO