geophysics - Germany / German Democratic Republic 1980 - 25 Pfennig

Geophysics The Ministry of Posts and Telecommunications of the German Democratic Republic publishes four multicolored special postage stamps on the subject of geophysics. In geological exploration, geophysical measurements on the surface of the earth and in well-drilled wells (well logging) play an important role today, especially with regard to reducing the costly drilling that is still required. The numerous methods used are based on the utilization of natural and artificial physical fields (eg gravitational and magnetic field of the earth, generated electric and acoustic fields) as well as the different physical properties (eg density, magnetic susceptibility, electrical conductivity, propagation velocity of sound waves) of the different rock types. In this case, even with modern electronic measuring devices and data processing on powerful computers usually only indirect statements about possible deposits can be obtained. The most significant benefit of geophysical results is the potential optimization of well approaches and the increase in information yield from wells. The geological industry and the mining industry of the GDR use geophysics as one of the most important means of rationalization in the forced exploration and promotion of domestic raw materials. By far the greater part of all field and borehole geophysical work in the GDR is provided by the VEB Geophysik Leipzig, which also develops and produces the majority of the necessary measuring equipment. The fulfillment of the planned tasks of this enterprise is significantly promoted by the direct support of Soviet specialists as well as by a manifold cooperation with partner institutions in the USSR and other socialist countries as well as academy and higher education institutions of the GDR. 25-pfennig value: Borehole measurement / water exploration The steadily increasing demand for drinking and industrial water in the GDR must be met by exploring and developing new groundwater supplies - even at greater depths. The extensive drilling program required for this is to a large extent prepared by geophysical measurements on the earth's surface. However, well measurements (especially flow rate and electrical resistance measurements) with special probes in exploration wells and wells, which can be used to obtain information about the depth and yield of the aquifers in a rational way, also play a significant role. The motif shows in a stylized form a developed through a hole layer profile with aquifer in addition to an electrical Bohrlochmeßsonde and related to the profile Bohrlochmeßkurve.