But the level of maturity of organic matter in the source rocks is obviously lower, because the lower tertiary source beds are of shallower burial and smaller geothermal gradient.

但由于生油层埋藏较浅，地温梯度偏低，致使各生油层有机质的成熟度明显比好生油凹陷低，主要生油层目前仍处于低成熟—成熟演化阶段。

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By using a new method and pyrolysis date of rock, study on expulsion efficiency of hydrocarbon for lower tertiary source rock has been carried out in north area of lower Dongpu Depression.

利用岩石热解资料，采用一种新的方法，对东濮凹陷北部地区下第三系源岩的排烃效率进行了研究。

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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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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

While the Shenandoah appraisal well encountered more than 1, 000 feet of net pay in high-quality Lower Tertiary-aged reservoirs, the Coronado exploration well encountered more than 400 feet of net pay.

FORBES: ConocoPhillips' New Finds Will Boost Outlook Amid Weaker Production

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