Israel’s Leviathan gas field estimated up to 20 tcf

Jan 17, 2012 12:00 AM

Leviathan partners Noble Energy, Delek Group and Ratio Oil Exploration have sharply revised downward the potential oil reserves in the structure, but revised the gas reserves upwards. The revised estimates are of 600 mm barrels of oil and an additional 4 tcf of natural gas, a 25 % increase on the previous estimate of 16 tcf.
The revisions are due to the new reporting rules on reporting oil and gas discoveries instituted by the Israel Securities Authority in early 2011.

The companies also notified the TASE that the Homer Ferrington rig, owned by Noble Corp reached the drill site at Leviathan, and will begin drilling an exploratory well to the deep oil-bearing strata within days. Drilling of the Leviathan 2 and 3 exploratory wells by the Pride North America rig was suspended in February 2010 after several breakdowns in the borehole's casing.
The revised estimate was expected, and does not indicate any disappointment about Leviathan's reserves. Nonetheless, the announcement's details include good news, beginning with the doubling of the probability for finding oil in the upper oil-bearing strata, for the companies' investors.

Delek and Ratio said that Leviathan's deep strata has two prospects with almost the same mean estimates substantial quantities of oil and gas. The upper Lower Oligocene strata could have 285 mm barrels of oil and 2 tcf of gas with a geological probability of success of 15-17 %. The lower Middle and Lower Cretaceous strata could have 280 mm barrels of oil and 2 tcf.
The high estimate for the reservoirs are 1.2 bn barrels of oil and 7.5 tcf of gas in the upper strata and 560 mm bn barrels of oil and 3.6 tcf of gas in the lower strata.

In August 2010, the Leviathan partners announced discoveries of the deep target strata at the Rachel and Amit licenses of Leviathan: 3 bn barrels of oil with a 17 % probability of geologic success in strata at a depth of 5,800 meters, and 1.2 bn barrels of oil with an 8 % probability of geologic success in strata at a depth of 7,200 meters.
These estimates were based on the gross mean of the reservoirs. Noble Energy owns 39.66 % of Leviathan, Delek units Avner Oil and Gas and Delek Drilling each own 22.67 % and Ratio owns 15 %.

The August 2010 announcement is based on the Gross Mean model. Under the Securities Authority's new rules, notices about gas and oil discoveries must be based on the Petroleum Resources Management System (PRMS), which can result in lower estimates than the gross mean model.
The differences can be substantial in cases in which there is a wide range of estimates between the high and low estimates, which are characteristic of unknown geologic structures, such as Leviathan.

Another reason for lower estimates is the PRMS model, which requires splitting gas and oil estimates which were combined under the Gross Mean model. The Leviathan partners said that the oil trap in the 34 mm Oligocene strata does not exist. The strata is thin and unlikely to have much oil.
However, deeper a previously unknown Cretaceous structure, dated 70-145 mm years ago, was found, and the probability of success of finding oil was doubled from 8 % to 15-17 %.

Drilling the well to the oil-bearing strata should take two months and cost $ 45 mm, and the total cost of Leviathan's exploratory well will reach $ 215 mm, making them it one of the most expensive wells in recent years worldwide.
The Sedco Express rig, which drilled the first exploratory well at Leviathan was transferred to the Tamar reservoir, also owned by Delek and Noble Energy, together with Isramco and Alon Natural Gas Exploration, in order to meet the tight timetable for developing the reservoir and beginning gas deliveries.


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