Specifics of the formation of oil and gas plays associated with effusive formations

Volcanic systems and associated volcanoclastic rocks are complex objects that may contain commercial hydrocarbon deposits. Their importance in the exploration of new oil and gas fields is currently greatly underestimated, and accumulated knowledge remains insufficient. According to published data, the success rate of discovering economically beneficial reserves in these formations is very high, so all examples of development of individual deposits in China, India, Japan, Indonesia, Argentina, and elsewhere require further study. The reservoir properties of these rocks depend on their geological age and position within the geological section, and this criterion should be taken into account when selecting potential analogs. Petrophysical reservoir properties deteriorate with depth to 3200–4000 m, after which they retain their potential to a depth of 5500–6200 m, and likely beyond. The pore space is characterized by a complex structure, which enables high permeability values with relatively low porosity. This creates the potential for the formation of massive natural gas reservoirs, confined by capillary seals, in the central parts of the basins. In the Russian Federation, one of the promising oil and gas basins associated with effusives is the Zeya-Bureya basin, genetically related to the significantly better-studied Songliao basin (China). For the Upper Paleozoic sections of the southeastern Kazakhstan basins, such analogs could be the Sichuan and Junggar oil and gas basins (China), where numerous oil and gas deposits were discovered and are under development.

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