ÇAĞRILI KONUŞMALAR / KEYNOTES Invited Speeches ... - TPJD

Research of Geothermal Fields by Utilising Potential Field Data
Seyfullah Tufan, Adil Özdemir, Melike Doğanay
Adil Özdemir Engineering and Drilling, Ankara
Gravity and magnetic methods, are oriented to potential theory, main geophysical survey
methods. Generally, on the exhaustive fields, available to research of the whole mineral property
(mineral, oil, geothermal etc.), detailed geological survey, other geophysical survey and drilling
studies oriented for determining target fields and additionally, in the world and Turkey, fields
of application are on the increase on the grounds that these methods are low-priced. Gravity
method is affected from the gravitational field and magnetic method is affected from the
magnetic field. Underground, heterogenous structure, consists of mineral condensations form
to magmatic, sedimentary, metamorphic and economical richness. These rocks and mineral
condensations are different density and magnetic susceptibility at the different depths and
sizes. All of the differences cause to variations on the vertical component of the acceleration
of gravity and magnetic field. These variations are measured by special improved tools and the
basis of gravity and magnetic methods is evaluation and interpretation of these measurements.
The bouguer correction of the magnetic data, transformation of magnetic data to gravity data,
approximation from the power spectrum to geological structure depth, determination of
approximately boundaries of the geological structure causing to this anomaly, geologically 2B
modelling of the aerial magnetic data and 3B modelling by means of prisms methods use for the
interpretation of the aerial magnetic data and modeling of the geological structure causing to
this anomaly. Determination of the compatibility to the geothermal survey of a field, at first, local
geology, geophysical (aerial magnetic and regional gravity), elevation and satellite image data
should be analysed in common. And later, detailed surveys (geological mapping, geochemical
sampling, geophysical and drilling works) should be done. It is clear that if it is standardised
to be done of locally preliminary investigations with potential field data (aerial magnetic and
regional gravity) before than licence purchase, field purchase-recirculate and detailed surveys,
it will make a great contribution to the sector. In this study, research of geothermal fields by
utilising the aerial magnetic and regional gravity data investigated by examples. Advantages of
locally preliminary prospecting by using potential field data before than detailed researches at
the geothermal surveys and best available results have been presented by this study.
Keywords: Potential Field Data, Regional Gravity, Aeromagnetic, Geothermal
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