Methodology of the indirect temperature estimation basing on magnetotelluric data: Northern Tien Shan case study

Spichak, Viacheslav V.; Zakharova, Olga K.; Рыбин, А. В.

doi:10.1016/j.jappgeo.2010.12.007

Cited by 30 publications

(11 citation statements)

References 12 publications

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“…The temperature profiles revealed using the resistivity profiles determined from the MT data in the nearest sites were compared with those determined in the same boreholes by neural network interpolation of the temperature logs collected in all other wells. According to (Spichak et al, 2011c) the average relative error of temperature prognosis constructed in accordance with the first technique was 11.9%, which turned out an unexpectedly good result for the region of interest, because it has a rather complex geologic structure and widespread of temperature distribution (Zakharova et al, 2007). The average relative error of neural network prognosis involving sets of temperature logs only amounted to 29.5%.…”

Section: Temperature Estimation In the Interwell Spacementioning

confidence: 98%

“…The latter is known as a powerful approximation tool, which does not require preliminary knowledge, and could extract necessary information from the input-output data pairs used for its training (see Spichak [2011] for a review on ANN application in the EM induction studies). According to Spichak et al (2011c), the application of the indirect EM geothermometer consists of the following steps:…”

Section: General Scheme Of the Indirect Em Geothermometermentioning

confidence: 99%

“…Comparative analysis of the temperature interpolation accuracy provided in (Spichak et al, 2011c) clearly shows that it is controlled by four factors related to the characteristics of the space between the Figure 6. MT resistivity structure correlated with lithology and temperature at Southern Leyte, Philippines (after Layugan et al, 2005).…”

Section: Temperature Estimation In the Interwell Spacementioning

confidence: 99%

“…A solid line indicates the measured temperature, and a dashed line indicates the temperature model based on the ANN interpolation of the temperature data collected in other boreholes; a line with dots represents the temperature model based on the resistivity profiles revealed from data collected in the nearest MT sites (afterSpichak et al, 2007bSpichak et al, , 2011c.…”

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confidence: 99%

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The subsurface temperature assessment by means of an indirect electromagnetic geothermometer

Spichak

Zakharova

2012

GEOPHYSICS

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Advances have been made in the subsurface temperature estimation basing on the indirect electromagnetic geothermometer. The approach used was based on the artificial neural network technique, which, contrary to other available approaches, does not imply the prior knowledge of the electrical conductivity mechanisms and rock properties. Application of the indirect EM geothermometer to the interwell space interpolation in three areas (Tien Shan, Kyrgyzstan; Soultz-sous-Forêts, France; and Hengill, Iceland) characterized by different geologic environments indicated that the temperature estimation errors are controlled by four factors: faulting, distance between the EM site and the area where the temperature is estimated, meteoric and groundwater flows, and lateral geologic inhomogeneity (although the latter factor is less restrictive if appropriate EM inversion tools are used). It was demonstrated that the extrapolation errors depend on two factors: spacing between the EM site and the borehole, and ratio between the well length and the extrapolation depth. In particular, the relative accuracy of the temperature extrapolation to the depths twice as large as the borehole depth did not exceed an average of 5%. Using the indirect EM geothermometer, it was possible to reconstruct 2D and 3D temperature models of the studied areas from EM sounding data, which, in turn, enabled us to draw important conclusions regarding the dominating heat transfer mechanisms, fluid circulation paths, and better locations for drilling new boreholes. Application of the indirect EM geothermometer during exploitation of the geothermal reservoirs may enable one to monitor the variations of subsurface temperatures basing on the ground EM monitoring data and forecast future trends.

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Section: Temperature Estimation In the Interwell Spacementioning

confidence: 98%

Section: General Scheme Of the Indirect Em Geothermometermentioning

confidence: 99%

Section: Temperature Estimation In the Interwell Spacementioning

confidence: 99%

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confidence: 99%

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The subsurface temperature assessment by means of an indirect electromagnetic geothermometer

Spichak

Zakharova

2012

GEOPHYSICS

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“…The indirect electromagnetic geothermometer was used for building of the deep temperature cross-section in the Chu depression area (northern Tien Shan) based on the magnetotelluric sounding data and available temperature logs (Spichak et al, 2011;Zakharova, 2010, 2013). Below we will consider the main results of the studies following these publications.…”

mentioning

confidence: 99%