G. E. Klefstad, 1992. "West Chalkley, Cameron Parish, Louisiana: A Case for Continued Exploration in Mature Producing Provinces", Giant Oil and Gas Fields of the Decade 1978-1988, Michel T. Halbouty
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A potential giant gas field has been discovered in the very mature exploration province of south Louisiana, by Transco Exploration Partners (TXP) and Exxon Company U.S.A. The West Chalkley prospect is located in Cameron Parish, Louisiana, and is productive in the upper Oligocene Miogypsinoides (Miogyp) sands. This discovery is in the same producing trend as the prolific South Lake Arthur field, where the Miogyp sands have gas reserves on the order of 1.0 tcf.
The West Chalkley prospect was generated by a combination of trend analysis, subsurface well control, and reflection seismic data. The feature appears to be a faulted anticline separate from the nearest production in the area, Chalkley field, which is located about 1 mi (1.6 km) to the east and was discovered in 1938.
Both TXP and Exxon, working independently, recognized the potential prospect and pursued leasing activities in the area. TXP initiated discussions with the landowner in February 1988 and acquired a 960-ac (3.9-km2) lease in June. Exxon leased approximately 2100 ac (8.5 km2) surrounding the TXP lease about one month later. TXP subsequently sold the prospect to Exxon on October 12, 1988. The Exxon #1 Sweet Lake Land & Oil Company was spudded on March 16, 1989, and reached a total depth of 15,600 ft (4755 m) on July 4, 1989. Log analysis indicated a net gas pay zone of nearly 500 ft (152 m) in the 805-ft (245-m) gross productive interval. Testing through perforations near the base of the pay zone yielded flow rates as high as 21.028 MMCFGD and 330 BCPD.
The well was put on production in March 1990 and has produced at rates as high as 45.4 MMCFGD and 740 BCPD. Two successful offsets have been logged, and a third is drilling. At least three more wells are scheduled, with one being a deeper pool wildcat.
Figures & Tables
The success of Memoir 14 and the worldwide interest shown for data on giant fields prompted AAPG to schedule a symposium on giant fields at the end of each subsequent decade. The 1968-78 symposium was held in Houston, Texas, April 1-4, 1979, and the papers were published in AAPG Memoir 30, December 1980.
The Stavanger Conference "Giant Oil and Gas Fields of the Decade: 1978-1988" was held in Stavanger, Norway, September 9-12, 1990, and is a continuation of the Giants of the Decade series.
Scientific studies and projections of future world energy demand indicate that although alternative-energy fuel sources must be actively pursued and developed, there also must be adequate petroleum supplies to bridge the gap. For the international petroleum industry, the years covered by this conference, 1978-88, were complex. They were years of boom and bust. The world's energy consciousness was boosted sharply by the effects of the 1979 Iranian revolution and the resulting embargo, which sent world oil prices to record heights. Global petroleum exploration soon surged, leading to the industry's all-time drilling high in 1981. Then came the oil price collapse in 1985, and the following years were characterized by falling oil prices and drastic budget cuts for exploration and development.
Although exploration dropped sharply during the latter part of the decade, there was a steady flow of giant oil and gas field discoveries. Using the giant field designation criteria of 500 million bbl of oil recoverable for fields in Asiatic Russia, North Africa, and the Middle East,