Interpretation of 3-D MT survey data in the southeastern Bukharo-Khivinsky oil and gas prospective region of Uzbekistan

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.

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