Eastern China deep oil-gas exploration is very difficult, but remaining resources amount and exploration potential are great.

中国东部深层油气勘探难度大，但剩余资源量及勘探潜力也大。

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Currently the main directions of oil and gas exploration in Jianglin Depression are secondary hydrocarbon reservoirs, deep hydrocarbon reservoirs and lithologic oil pools.

目前江陵凹陷油气勘探的主要方向为次生油气藏、深层油气藏和岩性油藏。

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The exploration of mid-deep oil and gas is constrained mainly by reservoir petrophysical changes of deep Dongying and Shahejie Formations.

辽中凹陷沙河街组及部分东营组储层埋藏深度大及储层物性变化大的特点制约了中深层油气的勘探；

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The WDCS says one problem is the expansion of oil and gas exploration into the deep seas and the resulting growth in seismic testing to find fossil fuel deposits.

BBC: NEWS | Science/Nature | The deafening sound of the seas

Ultra Deep wells are fantastically expensive, especially for a small oil and gas exploration company such as McMoran.

FORBES: Where is McMoran's Missing Press Release?