![]() ![]() (c) The experiment is replicated with a more complicated conductivity model with near-surface inhomogeneities added. By simple inspection of the data map, it is easy to locate the center of the conductive anomaly. (b) corresponding apparent conductivity map. 179 : (a) Bird-eye view of gradient array survey over a simple conductive prism model ( \(\rho= 10\ \Omega \cdot m\)) buried in a uniform halfspace ( \(\rho= 100\ \Omega \cdot m\)) and Obtained, but again there is no quantitative information about the depth.įig. AnĮstimate of the horizontal location of the center of the prism can be The correspondingĪpparent resistivity map is shown in Fig. Survey consists of a grid of 13 x 13 receivers located between a 450 meterĭipole current source. Model and electrode geometry is shown in Fig. Gradient array surveys are often used in reconnaissance modes and it is insightful to repeat theĪbove analysis with a representative example. (c) Vertical section through a more complicated resistivity model with near-surface inhomogeneities added and (d) resulting pseudosection of apparent resistivity. (b) Pseudosection of apparent resistivity calculated from the synthetic DCR survey. Source and receiver locations for a dipole-dipole survey are shown for reference. 178 : (a) Vertical section through a simple conductive prism ( \(\rho=10 \ \Omega \cdot m\)) buried in a homogeneous halfspace \(\rho=100 \ \Omega \cdot m\). Response of the prism is masked and attempting to infer existence and locationįig. The same dipole-dipole survey is carried out and Pseudosection is in n-values and not in meters.ĭespite the above success, the situation worsens if the earth is more complex. ![]() The image can be used to estimate the horizontal location of the prism but theĭepth to the body is less evident since the vertical scale of the The image and there are wings extending outwards and downward. Prism is manifested as a region of lower apparent resistivity in the center of The resulting pseudosection is shown in Fig. Is carried out along a line that passes directly above the conductive prism. Uniform halfspace ( \(\rho= 100\ \Omega \cdot m\)). 178 (a) shows an earth modelĬonsisting of a single prism ( \(\rho=10\ \Omega \cdot m\)) buried in a In addition, they sometimes provide valuable information about earthĪs an illustration, Fig. The images are useful for recognizing data outliers, badĮlectrodes, and validating normalizations that might have been applied to theĭata. Plotting apparent resistivities, as pseudosections or in plan-view maps, is Interpretation ¶ Apparent Resistivities ¶ ![]()
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