Kosmos opens ultra-deepwater gas play offshore Mauritania

Offshore staff

DALLASKosmos Energy (NYSE: KOS) says it has made a significant, play-opening gas discovery in block C-8 offshore Mauritania.

The drillship Atwood Achiever drilled the Tortue-1 well, designed to test the Tortue West prospect, 285 km (177 mi) southwest of the capital Nouakchott in 2,700 m (8,858 ft) of water. Planned TD of the well is around 5,250 m (17,224 ft).

Early analysis of drilling results and intermediate logging to a depth of 4,630 m (15,190 ft) suggests the well intersected 107 m (351 ft) of net hydrocarbon pay, encountering a single gas pool in the primary Lower Cenomanian objective.

The Lower Cenomanian comprises three high-quality multi-Darcy reservoirs with total thickness of 88 m (288 ft) over a gross hydrocarbon-bearing interval of 160 m (528 ft).

Additionally, the well penetrated a fourth zone 19 m (62 ft) thick within the secondary Upper Cenomanian target over a gross hydrocarbon-bearing interval of 150 m (492 ft).

Andrew G. Inglis, Kosmos’ chairman and CEO, said: “Volumetrically, the Tortue-1 well has far exceeded our pre-drill expectations and has discovered a large scale gas resource. Our seismic imaging indicates the areal extent of Tortue West could cover approximately 90 sq km [34.7 sq mi] that will be better defined with appraisal drilling…

“Our acreage offers substantial follow-on prospectivity including a diverse range of Cenomanian as well as deeper Cretaceous plays and fairways with strong dependency.”

Kosmos plans an appraisal program to delineate the discovery, and expects to spud the Marsouin-1 exploration well in the central part of block C-8 this summer.

It is also lining up a program to test other prospects, including Tortue East and North, in the Greater Tortue Complex which extends into the St. Louis Offshore Profond block offshore Senegal.

To support this program, a 3D seismic survey acquired over the company’s Senegal blocks last year is currently being processed and interpreted.

Chevron, which farmed into 30% of the C-8, C-12, and C-13 contract areas in March, has an option to take a 30% stake in the Tortue prospect by agreeing to pay a disproportionate share of costs related to the Tortue-1 well.

These three contiguous blocks, in water depths ranging from 1,000-3,000 m (3,281-9,842 ft), extend over a total area of around 27,000 sq km (10,425 sq mi).

05/11/2015

Did You Like this Article? Get All the Energy Industry News Delivered to Your Inbox

Subscribe to an email newsletter today at no cost and receive the latest news and information.

 Subscribe Now

Whitepapers

The Time is Right for Optimum Reliability: Capital-Intensive Industries and Asset Performance Management

Imagine a plant that is no longer at risk of a random shutdown. Imagine not worrying about losing...

Going Digital: The New Normal in Oil & Gas

In this whitepaper you will learn how Keystone Engineering, ONGC, and Saipem are using software t...

Maximizing Operational Excellence

In a recent survey conducted by PennEnergy Research, 70% of surveyed energy industry professional...

Leveraging the Power of Information in the Energy Industry

Information Governance is about more than compliance. It’s about using your information to drive ...