It is believed that the principle of porosity invariance during process of tight rock elastic deformation will provide a good deal of convenience for OOIP or reserve estimation.

致密岩石弹性变形过程中的孔隙度不变性原则将给储量计算带来很大的方便。

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Afraid that in her unclear state of mind she might fall off the rock to her death, Grant climbed on all fours up a tight, narrow path by digging into the earth with his fingers and feet until he reached Paula.

担心她在神志不清的状态下会从岩石上掉下来摔死，格兰特手脚插入泥土，四肢并用地沿着一条狭窄的小路往上爬，一直爬到宝拉身边。

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The existence of vast area of tight sand rock, low permeability of sand rock and plenteous gas supply are all favorable conditions for the formation of deep basin gas traps.

大面积致密砂岩的存在、砂岩的低渗透性以及充足的天然气供应都是形成深盆气藏的有利条件。

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Fracking is a vital contributor to the recent renaissance in the U.S. oil and natural gas supply picture, as it is the technology, along with horizontal drilling, that makes producing oil and natural gas from very tight shale rock formations possible.

FORBES: Stubbed Toe? Blame Global Warming...or Fracking

Much of this is based on unconventional methods of fracturing 'tight' or shale rock.

BBC: Burning issues for the world's future

Compared to many of their contemporaries, the Gits were instrumentally brilliant, playing fast, tight, classic punk rock which took a radical left turn when Zapata added her voice to the mix.

NPR: The Gits' Mia Zapata Resurrected In Film