They also venture into harsher climes and seek out unconventional sources of oil and gas that, in happier times, would be too costly to extract.

他们也敢在恶劣的环境下冒险寻找石油和天燃气的非传统资源，因为环境没这么恶劣的时候，提炼这些资源成本非常高。

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Increasing pressure in the oil and gas supply situation, the need to strengthen technology and theoretical research of unconventional oil and gas resources including heavy oil.

在油气供需压力越来越大的情况下，有必要加强包括稠油在内的非常规油气资源增产技术和理论的研究工作。

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Natural gas hydrate which plays a fair role in sealing the conventional oil and gas reservoirs is a new unconventional energy resources with great potentialities.

天然气水合物是一种具有巨大潜能的新型非常规能源资源，其对常规油气藏可起到很好的封盖作用。

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