Upstream Online  Oct 21  Comment 
US supermajor Chevron is revving up at Jack-St Malo, its first operated project in the US Gulf of Mexico's Lower Tertiary trend, after approving the $7.5 billion first phase of the development.
OilVoice  Feb 10  Comment 
Devon Energy Corporation announces that Maersk Oil has purchased Devons 25percent working interest in the Jack Lower Tertiary development project in the Gulf of Mexico. In December 2009 Devon
Commodity Online  Nov 17  Comment 
BP has confirmed that an appraisal well to test a western extension of the Kaskida field has confirmed oil in Lower Tertiary reservoirs five miles to the west of the Kaskida discovery well
Forbes  Oct 2  Comment 
The Lower Tertiary play in the Gulf of Mexico may not live up to the hype.
Upstream Online  Sep 2  Comment 
UK supermajor BP has made what it claims is a "giant" oil find at the Tiber prospect in the deep-water Gulf of Mexico's Lower Tertiary play.
Upstream Online  Aug 17  Comment 
UK supermajor BP will be able to determine in two years how much more oil it can produce from the Lower Tertiary trend in the US gulf, executive Neil Shaw said.


The lower tertiary is an informal designation for a layer of the earth's crust deposited during the Paleogene period, between 65 and 23 million years ago.

In the oil exploration industry, the Lower Tertiary is usually shorthand for deepwater drilling in the Gulf of Mexico that reaches down to the "lower tertiary" region of the earth's crust, much deeper than traditional offshore drilling, which reaches only to younger (and closer to the surface) miocene period rocks. While onshore drilling often reaches down to the lower tertiary, it was only in 2006 that companies were able to drill down to this level offshore. Production from this region isn't expected to come online until 2010.

Companies have drilled several test wells down to the lower tertiary in the gulf of Mexico, such as Cascade, St. Malo, Jack, and Kaskida, but none are operational yet.

Companies with operations in the lower tertiary include:

  • ChevronTexaco (CVX) has the largest exposure to the lower tertiary of any company, and owns 50% of the Jack 2 rig - a test well that set over half a dozen world records for equipment pressure, depth, and duration.[1]
  • Devon Energy (DVN) has the second largest exposure to the lower tertiary, and owns 25% of Jack 2.[2]

Other notable players include:

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