The reservoirs found in the Lower Tertiary are mainly structural and stratigraphic type.

下第三系发现的油气藏以构造油气藏和地层油气藏为主。

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The accumulated oil and gas in the trap came from the Lower Tertiary hydrocarbon source rock 2000~5000 meters below.

渤海油区上第三系为河流相沉积，不能生油，其圈闭中聚集的油气来自2000?。

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In the regional stratigraphic classification and correlation, the Lower Tertiary strata are absent in Guyang basin, Inner Mongolia.

在区域地层划分与对比中，内蒙古固阳盆地缺少下第三系。

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Chevron has 100 prospective drilling spots in the Gulf of Mexico, but its highest hopes for a resumption of deepwater drilling lay in an area called the Lower Tertiary Wilcox trend, near where the continental shelf drops off into deep water.

FORBES: Magazine Article

As if anyone had forgotten, discoveries like these show that there remains massive opportunities for oil and gas discoveries in the Gulf of Mexico, especially in the so-called Lower Tertiary Wilcox trend, which Chevron says could contain 12 billion barrels.

FORBES: Chevron And BP Reveal Big New Deepwater Finds In The Gulf Of Mexico

These days a lot of Chevron's combined brain and computer power is tuned to peer into the gulf's promising Lower Tertiary Wilcox trend.

FORBES: Magazine Article