Field accuracy of geophysical observations

Abstract

He solution of various geological exploration problems by geophysical exploration methods is generally divided into two main operations: 1) the study of the physical field (magnetic, gravitational, etc.), against the background of normal values ​​of which anomalous values, caused by the influence of various geological objects, are more or less clearly distinguished; 2) geological interpretation of the physical field, i.e. decoding (quantitative or qualitative) of anomalous values As a result of these measurements, sometimes quite complex, including in the overwhelming majority of cases elements of mathematical processing, and in some cases interpretation (seismograms, spectrograms), exploration geophysicists will receive for each point where the measurement was made, a certain value of the parameter of the physical field. Based on these values, graphs, contour maps, vector plans, hodographs, etc. can be constructed, which are the main and only material subject to interpretation in the geological sense of the word. However, before proceeding to the interpretation of the obtained graphs, maps, hodographs, etc., it is necessary to have a very clear idea of ​​their reliability, or, in other words, it is necessary to take into account the magnitude of the error made during measurements, which characterizes the field accuracy of observations. Although the field accuracy of observations is not the only factor determining the accuracy of the geological interpretation of results, in a number of cases it plays a very significant role along with other factors (observation network, physical properties of rocks, etc.).