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1301. TES. Median algorithm
... Two algorithms: the principal component's method (MPC) and median polishing (Median) are applied for that [2-3] . The algorithm of median polishing was offered by John W. Tukey (1981), and was applied after modification by E.V.Pervago for processing of Resistivity Imaging or Total Electrical Sounding (TES) data. ... To this table we apply algorithm of median polishing, but in addition to rows and columns we shall also include in processing inclined lines, corresponding to C-effect. ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/median.htm -- 5.2 Кб -- 22.06.1999
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1302. TES. Modeling example.
The essence of VES data processing may be shown on a flexure fold model (The central part of model is shown on fig.6). 2D modeling data for the flexure fold added with NSI were processed with the IPI-2D package, but at first example deep objects resistivities were made equal to surrounding to neglect their influence. ... Full model of flexure fold with NSI and deep objects . ... Comparison of apparent resistivity fields after filtering (a) and calculated without NSI (b) . ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/ip2d_007.htm -- 5.2 Кб -- 22.06.1999
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1303. TES. Visualization
VES visualization as the dependence Rho a =f ( r ) is suitable for analysis of only HLS . ... For that the special visualization program IPI-2D was developed, which helps to draw VES data in many forms. a) Rho a cross-sections for AMN & MNB pole-dipole arrays give the first representation of structure under investigation, its inhomogeneity and NSI influence (see fig.7 ). b) D - transformations gives the difference between AMN & MNB (D) and its horizontal derivative - dD/dX (R) . ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/ip2d_008.htm -- 4.1 Кб -- 22.06.1999
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1304. TES. Conclusion
Near-surface inhomogeneities are the source of geological noise and their influence give the main part of total field dispersion. Nearly 70% of all VES curves are distorted by geological noise. The most reliable approach to VES data processing on our opinion consist in canceling geological noise before interpretation. ... For effective canceling geological noise the special electrical sounding technology is needed. ... A.A.Bobachev, I.N.Modin, E.V.Pervago, V.A.Shevnin. ... I.N.Modin. ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/ip2d_009.htm -- 3.8 Кб -- 22.06.1999
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1305. TES. C-effect
... The main cause of that is in the difficulty of finding C-effect on Rho a pseudo-cross-section when all VES's were measured with logarithmic distance step. On fig.2 and 5 are shown results of modeling VES over two-layered structure with one NSI. (2a - the model; 5a - Rho a pseudo-cross-section for AMN array, 5b - V-transformation; 2c - different VES curves for several variants of meeting elements of array and NSI (fig.2b), 0 - non-distorted and 1-4 - distorted by P or C-effect). ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/ip2d_005.htm -- 4.6 Кб -- 22.06.1999
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1306. TES. Processing
TES data processing aims to divide the total field into components and to cancel these, caused by geological noise. The interpretation is fulfilled firstly in 1D variant (in the frame of horizontally-layered model, with IPI-1D package), and then in 2D variant (with IE2DL package). ... This model can be corrected with the help of different transformations for better seeing position and form of the deep objects. ... Two different approaches to the interpretation of profile VES data are possible. ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/ip2d_006.htm -- 4.1 Кб -- 22.06.1999
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1307. TES. Base model
The old base model for VES data interpretation was horizontally-layered medium. We consider as the new base model ( fig.1 ) a combination of horizontally-layered structure (HLS) , deep inhomogeneities (DI) (3-4 on fig.1) and nearsurface inhomogeneities - NSI (1-2 on fig.1). TES field technology includes the next rules: . ... In turn AO max depends on depth of investigation h max . ... These effects depends also on the fact: is this dipole group or single electrode moveable or unmoveable. ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/ip2d_003.htm -- 5.7 Кб -- 22.06.1999
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1308. TES. P-effect
... P-effect shows itself as a vertical shift of VES curve along axis Rho a without form changes, like well known S-effect in MTS. ... For segmented curve it may be done firstly by partial normalization (all segments are moved up to coming into contact with each other) and then by fuller normalization (all VES curves on profile are moved to the same base level of apparent resistivity). This base level may be selected on the most unchangeable part of all curves (fig.4). ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/ip2d_004.htm -- 3.9 Кб -- 22.06.1999
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1309. TES tecnology. MSU.
Moscow State University Geological Faculty, Department of Geophysics . ... The signs of distortions on VES data and their role for data interpretation . ... TES field technology . ... Data processing and interpretation . ... Data visualization for TES technology. ... Field example. ... In MSU this technology appeared in 1991. ... TES modification consists of the four interconnected technologies: field measurements, data processing, visualization and interpretation. ... E-mail: sh@geophys.geol.msu.ru . ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/ip2d_000.htm -- 4.7 Кб -- 22.06.1999
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1310. TES tecnology 2
There are several groups of VES data distortion's signs: . Signs for a single non-segmented VES curve: a) when part of VES curve goes up at an angle more than 45 ; b) when part of VES curve goes down more steep, than VES with mue=0; c) there are abrupt extremums or break points on VES curve, that are not match with theoretical horizontally-layered curve. ... For the pair of pole-dipole VES curves, with a reference point in the center of MN (AMN+MNB): differences in form of these two curves. ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/ip2d_001.htm -- 4.6 Кб -- 22.06.1999
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1311. TES. Field example.
Field data, presented on fig. 11 were measured in town N (Samara region) at the study of oil pollution from refinery. ... Lower picture shows the rest or geological noise canceled with processing. 1D data interpretation gave traces of oil polluted zone in limestone as objects of low resistivity (fig.12) . Fig. ... Oil polluted zones (black) in limestone on 1D VES data interpretation 119899, Russia, Moscow, Moscow State University, Geological Faculty, Department of Geophysics . ...
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/field.htm -- 3.4 Кб -- 22.06.1999
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1312. http://www.geol.msu.ru/deps/geophys/2d/d_transf.htm
. 1. Psedo-cross-section of observed field for pair pole-dipole arrays. 2. D and R transformations, which stress deep conductive objects (pipes).
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Ссылки http://www.geol.msu.ru/deps/geophys/2d/d_transf.htm -- 1.7 Кб -- 22.06.1999
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1313. Current lines
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Ссылки http://www.geol.msu.ru/deps/geophys/tok.htm -- 1.4 Кб -- 22.06.1999
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1314. IPI2win - 1D interpretation of VES profile.
Links to DC resistivity and IP software in WWW ] . IPI2win is a program for 1D automatic and manual interpretation of VES curves. VES curves could be received with different arrays: Schlumberger , Wenner , dipole-dipole , pole - pole . ... You could change parameters of model in different ways: . ... on resistivity cross-section; . drag-and-drop the part of resistivity curve (blue). Simultaneously You could see how new parameter fits with field curve and another models of profile. ...
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Ссылки http://www.geol.msu.ru/deps/geophys/ipi2win.htm -- 3.5 Кб -- 22.06.1999
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1315. http://www.geol.msu.ru/deps/geophys/inggeol.htm
Laboratory of engineering geophysics and shallow-depth electrical methods includes several scientific groups, headed by prof. A.A.Ogilvi and prof.V.A.Bogoslovsky, by prof.V.K.Khmelevskoy and by assoc. prof. I.N.Modin and V.A.Shevnin . ... Study of dynamics and pollution of underground water with the methods of borehole and aquatorial geophysics. ... A.A.Ogilvy, M.A.Ayed, V.A.Bogoslovsky. ... Application of geophysical methods for studying the technical status of earth dams. ...
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Ссылки http://www.geol.msu.ru/deps/geophys/inggeol.htm -- 4.5 Кб -- 22.06.1999
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1316. http://www.geol.msu.ru/deps/geophys/berd.htm
IPI_MTS - program for 1D madneto-telluric sounding interpretation ] . ... The theory of deep EM sounding on the base of analysis of the Earth EM field (divided into inner and outer parts, normal and anomalous ones, near-surface and deep anomalies). ... The theory and field technology of deep magnetotelluric sounding, taking into account the deep and near-surface inhomogeneities' influence, and MT data interpretation for 1D, 2D and 3D cases. ... Berdichevskij M.N., 1961. ... Berdichevskij M.N. 1965. ...
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Ссылки http://www.geol.msu.ru/deps/geophys/berd.htm -- 4.9 Кб -- 22.06.1999
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