On the use of double differences in inversion of surface movement measurements
conference paper
Surface movement data can be used in data assimilation or inversion exercises to improve the level of knowledge of a compacting reservoir. We have designed, implemented and tested a new algorithm that uses measured optical height differences directly, without having to translate them to heights with regard to a geodetic reference level. This way, the measurement points are independent of reference benchmarks. In addition, the accumulation of inaccuracy of the height difference measurements, which have to be connected to a stable benchmark over multiple connected benchmark pairs, is circumvented. Thus, the new method is less error prone. Individual errors in height difference measurements do not propagate into interpreted heights. The procedure was applied to a synthetic case study and compared with the traditional inversion using interpreted height measurements. The reduction in standard deviation between prior and estimated values for the different adjusted parameters was better for the new procedure. Copyright 2015 ARMA, American Rock Mechanics Association.
Topics
TNO Identifier
535442
ISBN
9781510810518
Publisher
American Rock Mechanics Association (ARMA)
Source title
49th US Rock Mechanics / Geomechanics Symposium 2015
Vol 1
Vol 1
Pages
716-725
Files
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