Separation of thin layered geological medium fields
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| Опубліковано в: : | Геофизический журнал |
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| Дата: | 2010 |
| Автори: | , |
| Формат: | Стаття |
| Мова: | Англійська |
| Опубліковано: |
Інститут геофізики ім. С.I. Субботіна НАН України
2010
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/101393 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Separation of thin layered geological medium fields / D. Gryn’, N. Mukoyed // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 53-56. — Бібліогр.: 2 назв. — англ. |
Репозитарії
Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1859596183498915840 |
|---|---|
| author | Gryn’, D. Mukoyed, N. |
| author_facet | Gryn’, D. Mukoyed, N. |
| citation_txt | Separation of thin layered geological medium fields / D. Gryn’, N. Mukoyed // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 53-56. — Бібліогр.: 2 назв. — англ. |
| collection | DSpace DC |
| container_title | Геофизический журнал |
| first_indexed | 2025-11-27T21:14:47Z |
| format | Article |
| fulltext |
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Separation of thin layered geological medium fields
D. Gryn’, N. Mukoyed, 2010
Institute of Geophysics, National Academy of Sciences of Ukraine, Kiev, Ukraine
dgrin@igph.kiev.ua
Within geological medium, as is known, various
types of waves appear and multiply quickly and their
propagation is accompanied by interferential phe-
nomena. Complication of wave field is especially
observable under condition of thin layered medium
while conducting prospecting works by high frequen-
cy seismic methods. Application of more complex
wave fields for studies of quantitative and qualitative
features of geological medium is able to bring to
incorrect conclusions. Therefore, for example, for
solving the problems of seismic studies based on
dynamic factors wave fields are to be of the same
type and not damaged by accidental and regular
waves-disturbances.
In our case difference method will be used which
has physical basis under it [Gryn’ M., Gryn’ D.,
2003]. The process of appearance, propagation and
multiplying of various waves is accompanied by their
interference. Therefore it seems natural to use pro-
cedures inverse to additive process: the search of
algorithms for definition of form of separate waves
or their groups and successive separation of the
wave fields and their extraction. Difference method
of target wave separation which is worked out is
such one when according to direction of dominant
wave on the temporal section or according to direc-
tion of assumed travel-time curve the differences
between each pair of adjacent tracks are being de-
termined successively. In this case, let us remind
shared elements are extracted. However adjacent
tracks of residual wave field superpose with inverse
sign, in other words they are dubbed and on the
edges of running processing windows the signals of
target waves remain, therefore edge effects arrear,
and for solving the problem we have conditions on
the edges. Operators of bringing residual waves to
initial form but with already extracted target waves
have been worked out for elimination of dubbing and
taking into account edge conditions.
Temporal section of target waves was determined
as difference between input wave field and residual
one. The procedure of target wave separation may
be repeated in the direction of other dominant waves
or according to other travel time curves.
Let us note that under land surface conditions of
observation essential reason of instability of wave
field effects of HFF may be considered with its vari-
ability of parameters, conditions of excitation and
observing, and the major disturbances strong sur-
face channel and main fields which superpose all
the band of frequencies of reflected waves. Resi-
dues of these waves-noises have negative effect on
the results of data processing by their dynamic pro-
perties.
Let us give an example of application of diffe-
rence method on averaging of several tracks in the
running window along the given direction according
to the results of "MP obtained in the area near West
Donbas mine, the Ternavska anticline (Fig. 1, a).
The main disturbances for these data are residual
modes of surface wave which frequency range coin-
cides with frequency of useful reflected waves. The
velocity of such waves is about 350 ( 100) m/s.
They have the same energy of amplitude as reflec-
ted waves and are present along all the profile.
The running window within which seismic tracks
are averaging and separation of target waves and
waves-noises takes place was realized on the base
of 60 m, that is only 3 tracks are involved with a
step of observation between them x=30 m. Sharp-
ness of characteristics of the direction of a group of
seismic receivers depends on the observation base.
Under conditions of sub-horizontal occurrence of
reflecting horizons the effect of the base upon tar-
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Fig. 1. Results of separation of reflected waves and waves-disturbances by difference method (Ternavska anticline, areas
near West-Donbas mine): � — input data "MP; b — residual temporal section; c — temporal section of target reflected waves
"MP.
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get waves is not strong but is observable on the
residual temporal section. In this case the base is
small and the angle of direction is wide. As a result of
applying differential algorithm, on the residual tempo-
ral section (Fig. 1, b) diffracted waves and residual
modes of surface waves have been revealed as well
as disordered vibration slightly intense process.
Target waves on the temporal section (Fig. 1, c)
are not complicated by disturbances, their dyna-
mic and kinematic indications are not changed. They
acquire stability and accuracy concerning input re-
flected waves, they are well correlated.
Non-complicated wave fields can be used, in
particular, for determination of elementary signal that
is an important stage for interpretation of seismic
data. It is known that seismogram consists of im-
pulse characteristics, elementary signal and diffe-
rent by their origin waves-disturbances. Temporal
and spatial change of elementary signal gives addi-
tional information about physical properties of geo-
logical medium. It is as well important for increase
of resolving capacity of seismic data because it is
used in deconvolution.
For�separation�of�elementary�signal�from�seis-
mograms�statistical�method�of�accumulating�ampli-
tude�spectrum�and�continuous�phase�spectrum�in
complete�angles�#Gryn’ M.!�Gryn’ D.!����$%!�be-
cause�there�is�a�possibility�of�application�of�some
elements�of�statistical�analysis to them, in particu-
lar, determining of their mathematical expectation
M[ ( )] through the whole range of frequencies of
the signal spectrum.
As�one�can�see�from�the�given�Figures�elemen-
tary signal obtained from the target waves is change
to some extent.�It�can�be�explained�with�the�fact
that�reflecting�boundaries�coincide with the direc-
Fig. 2. Elementary signal obtained from the temporal section of target (sub-horizontal) reflected waves &"MP!�Ternavska
anticline, the area near West-Donbas mine': � — wave field used for statistical accumulation!���— (FH�of elementary signal!
����elementary signal�
Fig. )��Elementary�signal�obtained�from�the�temporal�section�of�the�field�of�the�residues�of�surface�waves�&"MP!�Ternavska
anticline!�the�area�near�West*Donbas�mine'+���— wave field used for statistical accumulation!�����(FH�of elementary signal!
��— elementary signal�
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tion of statistical summation.�As�a�result�amplitude
spectra�are�reinforced and complicated by deflec-
tions. The signal, depicted in Fig. 3 does not have
this deficiency and looks as a “classical” elementa-
ry signal. It can be used for processing of fact ma-
terials by the method of phase de-convolution.
References
Gryn’ D. N., Gryn’ N. E. Algorithms for useful waves
separation // Geophys. J. — 2003. — 25!� 4. —
P. 84—98 (in Urainian).
Gryn’ M. Ye., Gryn’ D. M. Statistical evaluation of phase
spectra of seismic signals // Theoretical and ap-
plied aspects of geo-informatics. — Kyiv, 2005. —
P. 126—137 ( in Ukrainian).
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| id | nasplib_isofts_kiev_ua-123456789-101393 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0203-3100 |
| language | English |
| last_indexed | 2025-11-27T21:14:47Z |
| publishDate | 2010 |
| publisher | Інститут геофізики ім. С.I. Субботіна НАН України |
| record_format | dspace |
| spelling | Gryn’, D. Mukoyed, N. 2016-06-03T09:09:24Z 2016-06-03T09:09:24Z 2010 Separation of thin layered geological medium fields / D. Gryn’, N. Mukoyed // Геофизический журнал. — 2010. — Т. 32, № 4. — С. 53-56. — Бібліогр.: 2 назв. — англ. 0203-3100 https://nasplib.isofts.kiev.ua/handle/123456789/101393 en Інститут геофізики ім. С.I. Субботіна НАН України Геофизический журнал Separation of thin layered geological medium fields Article published earlier |
| spellingShingle | Separation of thin layered geological medium fields Gryn’, D. Mukoyed, N. |
| title | Separation of thin layered geological medium fields |
| title_full | Separation of thin layered geological medium fields |
| title_fullStr | Separation of thin layered geological medium fields |
| title_full_unstemmed | Separation of thin layered geological medium fields |
| title_short | Separation of thin layered geological medium fields |
| title_sort | separation of thin layered geological medium fields |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/101393 |
| work_keys_str_mv | AT grynd separationofthinlayeredgeologicalmediumfields AT mukoyedn separationofthinlayeredgeologicalmediumfields |