Conditions of saving oil gas field in last period are generally key factors of evaluating a deep oil gas field.

油气藏的后期保存条件往往是深部油气藏是否具有工业价值的决定因素。

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She talked to EarthSky about the high concentrations of methane gas she discovered in oil plumes deep beneath the surface of the Gulf.

她告诉EarthSky，深海处的原油层已经产生了高浓度的甲烷气体。

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For many countries, though, the first booty from any newly acquired seabed will be either oil or gas, both of which can now be extracted fairly easily from deep water.

对大部分国家来说，从这些新获得的海底陆地得到的第一件好处是石油或天然气，这两样能源现在都能很容易地从深层海水提纯。

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Hydraulic fracturing, or fracking, pumps millions of gallons of water mixed with fine sand and chemicals deep into oil and gas wells to crack gas-bearing rock.

WSJ: NY groups claim industry bias in fracking study

Oil and gas this deep in the earth is often as hot as 450 degrees and at pressures 2, 000 times atmospheric.

FORBES: Blowout Suspected in Transocean Rig Explosion

Fracking uses high-pressure mixtures of water, sand or gravel and chemicals to crack rock formations and release oil and natural gas deep underground.

NPR: Scenic, Struggling S. Illinois Braces For Oil Rush