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A short course in modern inversion techniques - Copenhagen 2012 v2
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 74th EAGE Conference and Exhibition - Workshops, Jul 2012, cp-298-00001
- ISBN: 978-90-73834-28-6
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Abstract
With the change in the SEC rules in 2010 regarding the booking of Proven Undeveloped Reserves (PUD) geophysical techniques that can be proven to be reliable and repeatable will have a large potential impact on the valuation of oil companies in the future. One of the more reliable techniques is seismic inversion. In recent years with the improvement in data quality, both seismic acquisition and processing and the use of partial and angle stack data has allowed the conversion of seismic reflectivity data to rock property information, from band limited acoustic impedance to petrophysical properties such as Vshale, porosity and water saturation. The precursor to any inversion is an analysis of the rocks themselves. This is required so we can gain an insight into their possible spatial variation in the area of interest. This comes from analyzing the rock properties using well data. Comparing the trends seen with existing rock physics models, empirical or theoretical, is an important part of the process. This will highlight any differences in a particular formation that might be related to depth, some form of alteration, cementation etc. After fluid substitution plotting the different elastic properties for each fluid case against each other will allow an understanding as to whether discrimination between lithology and or fluid is possible.