The southern part of the aldan-maya depression as a priority for oil and gas exploration

The article touches upon the problem of increasing the effi ciency of geological and exploration works aimed at prospecting for oil and gas deposits on poorly explored territories. It provides brief information on the extremely low degree of geological and geophysical exploration of the Aldan-Maya depression, one of the most promising territories on the southeastern edge of the Siberian platform. The abundant naphthide saturation of the Riphean deposits of the Aldan-Maya depression has been noted, which has no analogues among other zones of junctions of the platform structure with the folded belt along the whole perimeter of the Siberian platform. A structural map of the Aldan-Maya depression was built along the sole of the Malga Formation of the Middle Ripheus – the main design object of oil and gas exploration works in the region. It is noted that it is advisable to concentrate primary prospecting work on the southern part of the depression, where the maximum number of oil and bitumen shows associated with the Malginsky Formation was recorded in the peripheral part and liquid-drop oil was obtained in the core of the Lakhanda well.

The geological position and characteristics of oil and gas shows obtained in the course of exploration for ore minerals in the immediate vicinity of the Ingiliya ledge of the basement are described in detail. The assumption about the deep genesis of the oil and gas show is formulated due to the processes of extensive lateral migration of hydrocarbon fluids through the zones of subhorizontal fracture location. Preservation of liquid bitumen in the near-surface zone of terrigenous-carbonate complex indicates quite favorable conditions of preservation of these permeable near-surface zones and great prospects of oil and gas potential of deeper horizons of the Aldan-Maya depression.

 It is concluded that the discovery of oil and gas field in the southern part of the Aldan- Maya depression will allow forming a methodological approach to the knowledge of the features of oil and gas potential of the vast highly promising territory of the Siberian platform.

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