This is the 13758th most frequent Russian word.
нефтегазовой
"Relating to oil and gas."
The word 'нефтегазовой' here is an adjective describing the sector related to oil and gas industries, indicating its significant influence on the economy.
Экономика страны сильно зависит от нефтегазовой отрасли.
The country's economy heavily depends on the oil and gas sector.
In this context, 'нефтегазовой' qualifies 'промышленности' (industry), referring to the nature of the technologies aimed at serving oil and gas production needs.
Мы посещали выставку технологий для нефтегазовой промышленности.
We attended an exhibition of technologies for the oil and gas industry.
Here, 'нефтегазовой' describes the type of company, emphasizing its focus on oil and gas exploration, production, or transportation.