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Babajanov T.L.,Uzbekgeofizika | Kim G.B.,Uzbekgeofizika | Yuldashev G.Y.,Uzbekgeofizika | Fox L.,PHOENIX GEOPHYSICS LTD | Ingerov O.,PHOENIX GEOPHYSICS LTD
SEG Technical Program Expanded Abstracts | Year: 2011

Uzbekistan first used electroprospecting methods for hydrocarbon exploration in 1931. Since 1970, the main electroprospecting techniques used by Uzbekgeofizika (the main geophysical contractor in Uzbekistan) have been MT, LOTEM, and IP (Berdichevsky et al. 2001, Ingerov et al., 2003). MT was the principal method, but application until ca. 1995 was limited by several factors including heavy truck-mounted equipment, restricted frequency range, and insufficient computer capability. Therefore, MT was often followed by LOTEM for greater accuracy and detail and by IP, which can provide parameters associated with hydrocarbon presence in prospective structures. This combined approach increased the success rate of deep drilling. (Ingerov et al., 2003). Uzbekgeofizika acquired modern multifunction EM equipment in 2007; its portability and accuracy has enabled improvements in the application of EM methods to hydrocarbon exploration. The annual EM production of Uzbekgeofizika has attained 6000 MT sites and 2000 LOTEM and IP sites. By the end of 2010, Uzbekgeofizika had acquired over 16 000 MT sites with the new equipment. This large amount of new data generated a high-priority requirement for appropriate qualitative and quantitative interpretation. The authors here analyse some interpretation approaches for 3-D MT data acquired in the Buzakhur area in south Uzbekistan. The closely spaced Buzakhur 3-D MT grid was designed to supplement the uncertain seismic structural map and also to identify prospective targets indicated by local EM anomalies. © 2011 Society of Exploration Geophysicists.

Ingerov O.,PHOENIX GEOPHYSICS LTD | Babajanov T.L.,Uzbekgeofizika | Kim G.B.,Uzbekgeofizika | Yuldashev G.Y.,Uzbekgeofizika | Fox L.,PHOENIX GEOPHYSICS LTD
73rd European Association of Geoscientists and Engineers Conference and Exhibition 2011: Unconventional Resources and the Role of Technology. Incorporating SPE EUROPEC 2011 | Year: 2011

A 3D MT survey was undertaken in 2008 in a mountainous region of South Uzbekistan. The seismic method had encountered serious difficulties due to the complicated geology and the rough terrain that prevented vehicular travel. Uzbekgeofizica's electroprospecting crew from Bukhara carried out a 3-D MT survey in an area prospective for gas, moving from site to site on foot. A total of 1017 MT sites were collected in a grid of 200 m x 400 m spacing, using 17 Phoenix Geophysics SSMT System 2000 receivers in the frequency range 300 Hz to 0.0003 Hz. Data analysis shows that MT parameters derived from a dense grid accurately reflect the geology and can map positive structure positions as well as tectonics. More significantly, by using MT parameters and the results of their 1D and 2D interpretation, it is possible to differentiate productive and unproductive structures.

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