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Search and Discovery Article #10079 (2005)
Posted March 25, 2005
Although 2004 may not have been a year for elephant discoveries, a number of important wildcats were added to the world's reserve inventory potentials.
Below is a notation, with commentary, of some of those significant finds, as reported by the IHS Global E&P Reporting Service (www.ihsenergy.com), whose editors cover E&P activity in more than 200 countries. The accompanying map (Figure 1) shows the countries with the discoveries summarized herein. A more complete list, provided in Tables 1-9, is also on the EXPLORER website at www.aapg.org.
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uIntroductionuFigure/Table captionsuCent. & So. AfricauAngolauGabonuNigeriauSaharan AfricauAlgeriauEgyptuLibyauMauritaniauTunisiauAustralasiauAustraliauNew ZealanduEuropeuFranceuPolanduFar EastuBangladeshuChinauIndiauIndonesiauVietnamuLatin AmericauColombiauCubauMexicouVenezuelauMiddle EastuSaudi ArabiauKuwaituNorth AmericauGulf of MexicouUtahuReference
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Central and Southern Africa (Table 1)Four deepwater discoveries in the Congo Fan included Total's Canela 1, testing 6800 barrels of oil a day, and ChevronTexaco's KX2 flowing at 5000 bod.
Vaalco's Avouma 1 on the shelf of the Lower Congo Basin flowed 6600 bod.
Total's Preowei 1B in the deepwater Niger Delta area is potentially significant, as Total has already indicated a desire to develop the find even though the first appraisal well has yet to be drilled.
Saharan Africa (Table 2)First Calgary's Ledjmet South 1 wildcat weighed in with a 13,515 bod and 30.9 mmcfgd winner in the onshore Berkine Basin. Sonatrach hit big with its find in the Hassi Messaoud Basin, there testing 4445 bod with 4.3 mmcfgd, and with the BKP2 in the Oued Mya Basin, at 3072 bod and 21 mmcfgd.
Twenty-seven discoveries were reported, including Suco's 3000 bod find in the Gulf of Suez, Sipetrol's 3250 bod wildcat and Shell's Shieba 18-3 testing at 1600 bod with gas -- both in the onshore Abu Gharadig Basin.
Six discoveries were reported, including Repsol's find in the Murzuk Basin testing 1350 bod.
The offshore again has hosted a number of exploratory wells, and Dana's Pelican 1 is arguably the best. The operator confirmed in-place reserves of 1.03 tcf, with technically recoverable reserves in the range 600-800 bcf together with 10-13 mmb of associated liquids. However, as the base of the hydrocarbon-bearing interval was not encountered, these figures could be revised upwards.
ENI tested two discoveries in the Ghadames Basin, one testing 6200 bod, with 14.3 mmcfgd, and the other at 3600 bod. Australasia (Table 3)ChevronTexaco's Wheatstone 1 exploration well in the North Carnarvon Basin is viewed as a multi tcf gas find that is likely to be tied into Gorgon, or maybe even the Northwest Shelf. The well encountered 53.34m of net gas sands in the objective: Jurassic Tithonian and Triassic Mungaroo sands, in which a production test flowed 54 mmcfd of gas. Also worthy of note is that BHP-Billiton made a number of oil discoveries (Eskdale, Harrison, and Stickle) that have opened a medium-sized oil province in the offshore Carnarvon Basin.
The Amokura 1 and Pateke 2 discoveries, drilled by NZOP, were found to be in the same field. They represent the first oil discovery in New Zealand in a number of years. Europe (Table 4)At a country level, Les Mimosa 1GD is considered as outstanding, as it is one of several prospects to have been identified and most of the Lege permit, in which it lies, is now open for bidding. An Aquitaine Basin discovery by ExxonMobil flowed 1600 bod.
PGNG's Zaniemysl 3 in the Fore-Sudetic Monocline flowed 2.5 mmcfgd, and Cierpisz2 in the Outer Carpathian Foredeep tested at 26.9 mmcfgd. Far East (Table 5)Bangora 1, operated by Tullow, is a potentially huge, significant discovery that encountered a number of gas-bearing intervals between 2580-3285 meters. Three lowermost intervals were tested flowing a combined 120 mmcfgd, with the shallower units to be tested at a later date. The company has now tested gas at either end of a 400-kilometer-long anticlinal trend, and an accelerated appraisal program is planned.
Although no reserves have been assigned, Laopunan 1 has been proclaimed by PetroChina as its largest and most significant discovery in 2004, testing at 4400 bod and 5.6 mmcfgd. It is located in around three meters of water and was drilled on the Nanpu 2 structure in the southern part of the Nanpu Sag, Bohai Gulf Basin. PetroChina also struck with five discoveries in the Tarim Basin, including the Yugi 4, testing at 944 bod and 1.8 mmcfgd, and the Lungu 39, flowing at 355 bod and 41.3 mmcfgd.
For the second year, India's offshore has been a key exploration area. In 2004 it is the Reliance wells on the Dhirubhai structure in the NEC-OSN-97/2 block that are regarded as most significant, as these have shown the shallow water area of the Mahanadi Basin to hold significant amounts of gas. Reliance reported a total of seven discoveries in three offshore basins.
The Jeruk 1, a big oil discovery made by Santos with likely minimum reserves of 170 mmboe contained in the Kujung Formation in the offshore East Java Basin, has been successfully appraised. Eni completed Aster-1 as an important new field discovery. Although untested, this well opens the potential for a new deepwater play in the Tarakan Basin and has high-graded an area where the median line is disputed.
The 09-R 23X well is understood to have flowed about 1100 bod of 35-degree API crude and is claimed by the operator to be the first basement oil discovery in the southern part of Block 09 in the offshore Cuu Long offshore basin. Latin America (Table 6)Perenco's Jordon Este 1 flowed 1877 bod in the Llanos-Barinas Basin.
Although considered non-commercial, Repsol YPF's Yamagua 1 is an important well in that it is the first to be drilled in Cuba's deep water, and also because light oil was found. The structure is subject to further seismic evaluation, and at least two more wells are being considered.
Among the 21 discoveries reported by Pemex, seven are offshore, including the Itla 1 in the Gulf Coast Basin, testing at 1350 bod with gas, and the Kosni 1 in the Tampico-Misantla Basin, flowing 29.4 mmcfgd.
Oil-in-place for the Travi Este structure, successfully drilled by the Travi Este 2X wildcat, was estimated by PDVSA at the time of logging at 670 mmbo and 2.6 tcf of gas from a 220-meter net pay section in the Naricual and San Juan formations; this ranks among the country's most important wells in 2004. Also, ChevronTexaco's Loran 2X in the Plataforma Deltana is believed to have found reserves of 4-6 tcf and is being touted as the catalyst to launch the country's LNG project. Middle East (Table 7)Shaybah 700 is significant, as it established a new non-associated gas/condensate play, and work continues to evaluate a deeper gas objective. It has the potential to be a very large find with reserves estimated at 3 tcf of gas and 100 mmb condensate.
Mutriba 12 was reported to have discovered sweet gas and 50-degree API condensate in the Lower Triassic Sudair Formation; a second test suffered a technical failure. The well, drilled to a total depth of 6736 meters, is considered the first non-associated gas producer in Kuwait. KOC also found 4850 bod in the Dibdibah Sub-Basin with the Bahrah 28. North America (Table 8)Although no reserves have been published, the Jack (ChevronTexaco) and St. Malo (Unocal) discoveries are considered significant, as they both are located in the newly established Paleogene trend.
Wolverine Gas & Oil Company’s Navajo discovery in south-central Utah (on the “Utah Hingeline”) opens a new hydrocarbon province along the Western Overthrust belt. The associated play is characterized as “a leading-edge thrust belt structure.” Depth to target is less than 7000 ft (~2150 meters).
Significant discoveries known from
Russia and two countries that were part of the Soviet Union
(Turkmenistan and Uzbekistan) are given in Table
9.
St. John, Bill, A.W. Bally, and H.D. Klemme, 1984, Sedimentary provinces of the world – hydrocarbon productive and nonproductive (map with booklet): AAPG.
Table 1. Significant discoveries during 2004 in Central and Southern Africa.
Table 2. Significant discoveries during 2004 in Saharan Africa.
Table 3. Significant discoveries during 2004 in Australasia.
Table 4. Significant discoveries during 2004 in Europe.
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