Premium
ADVANCED METHOD FOR SELF‐ADAPTIVE ESTIMATION OF RESIDUAL STATIC CORRECTIONS *
Author(s) -
SÁGHY G.,
ZELEI A.
Publication year - 1975
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.1975.tb01527.x
Subject(s) - weighting , residual , geophone , offset (computer science) , time shifting , algorithm , computer science , mathematics , point (geometry) , statistics , geology , physics , telecommunications , geometry , transmission (telecommunications) , geophysics , acoustics , programming language
A bstract The estimation of residual static corrections is investigated as a linear system. For 1200% coverage shot one way offset weighting functions—or in other words, estimation error operators—are computed. Assuming zero time shift determination errors and zero RNMO it is seen that large residual corrections will distort the effectivity of the estimation. With an iterative procedure which includes the repeated averaging according to depth point, shot point, and geophone point the effectivity of the method becomes more favourable. This can be learnt from the evaluation of estimation error operators computed by recursive formulae. In practice, due to the time shift determination errors, the routine does not give improved results in the desired level. Errors can be reduced with a more reliable time shift determination routine. For detecting and suppressing the unfavourable effect of time shift errors still remaining in the data a self‐adaptive method was developed. In this non linear routine the data are evaluated at all three averaging processes according to limit values and weighting factors computed from the data itself. Field examples processed in different ways are presented.