Methods of transient em data compression
https://doi.org/10.18303/2619-1563-2022-1-4
Abstract
A transient electromagnetic signal is recorded in an earth formation while drilling at multiple times. Data for subsequent interpretation is transmitted via a hydrochannel with a narrow bandwidth, for that reason the amount of transmitted information is limited. Therefore, data compression is an indispensable element of processing. It is important to determine what parameters and how many of them are necessary to describe the measured EMF curve. The idea is to transfer to the surface only significant parameters allowing to restore the recorded curve with a given accuracy. The paper proposes simple and fast data compression methods based on the spline approximation of the signal. Also, an orthogonal basis in the measurement space is used to describe each signal by a linear combination of vectors from this basis. We analyze transient curves and consider various magnetic field components. Numerical experiments show how many parameters are required to describe and reconstruct the signal of a deep-reading electromagnetic tool.
About the Authors
M. N. Nikitenko
http://www.ipgg.sbras.ru/ru/institute/staff/nikitenkomn
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS
Russian Federation
Trofimuk Institute of Petroleum Geology and Geophysics SB RAS
Russian Federation
Koptyug Ave., 3, Novosibirsk, 630090
A. P. Mosin
ROGII
United States
United States
16000 Park Ten Place, Houston, TX 77084
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Review
For citations:
Nikitenko M.N., Mosin A.P. Methods of transient em data compression. Russian Journal of Geophysical Technologies. 2022;(1):4-16. (In Russ.) https://doi.org/10.18303/2619-1563-2022-1-4
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