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4D seismic: quantification of data uncertainty and generation of impedance and density change maps to determine fluid movement in a reservoir

IP.com Disclosure Number: IPCOM000252497D
Publication Date: 2018-Jan-18

Publishing Venue

The IP.com Prior Art Database

Related People

Inventors:
Joseph B Molyneux Greg Godek

Abstract

4D seismic data is produced by comparing a processed seismic cube acquired sometime in the past (the baseline survey) to a processed cube at the same location acquired more recently (the monitor survey) 4D seismic data is often used to monitor the net fluid displacement and pressure changes in a reservoir between baseline and monitor times. 4D seismic data has three components. First, as reservoir conditions change the velocity of the rock is affected resulting in a time delay between the two images. This delay can be evaluated from the data, corrected for, and displayed as a time shift cube. Second, once the baseline and monitor images are aligned in time, you can subtract the collocated amplitude values of the images from each other, resulting in a amplitude difference cube. A third cube can be generated by differentiating the time shift cube, resulting in a cube of percentage velocity change. We developed new products using maps extracted at the reservoir of interest from the amplitude change cube and the velocity change cube