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Lacq gas field : ウィキペディア英語版
Lacq gas field

The Lacq gas field is a natural gas field located in Aquitaine. It was discovered in 1950 and developed by and Total S.A.. It began production in 1958 and produces natural gas and condensates. The total proven reserves of the Lacq gas field are around 8.8 trillion cubic feet (251 km³), and production is slated to be around 1 billion cubic feet/day (35×105m³).
==Geology==
The Lacq Gas Field is a structural trap located in an anticline which formed in the southern part of Aquitaine Basin starting in the Cretaceous until the Tertiary with the Arzacq syncline to the north and the Eocene flysch trough in front of the Pyrenees foothills to the south.〔Winnock, E., and Pontalier, Y., 1970, Lacq Gas Field, France, AAPG Memoir 14: Geology of Giant Petroleum Fields, Tulsa: AAPG, pp. 370 and 386.〕 The field is 16 km long and 10 km wide with oil produced beneath a Tertiary unconformity at 700 m and gas, with high hydrogen sulfide content, beneath a pre-Cretaceous unconformity at about 4000 m.〔Winnock, E., and Pontalier, Y., 1970, Lacq Gas Field, France, AAPG Memoir 14: Geology of Giant Petroleum Fields, Tulsa: AAPG, pp. 370 and 386.〕 The anticline was identified with two exploration geophysics electric lines in 1943 and a magnetotelluric survey in 1943, a gravimetric survey in 1944 and a reflection seismology survey in 1947, which led to the Lacq No. 1 well in 1949.〔Winnock, E., and Pontalier, Y., 1970, Lacq Gas Field, France, AAPG Memoir 14: Geology of Giant Petroleum Fields, Tulsa: AAPG, p. 374.〕 The stratigraphic column begins with the Lower Jurassic Liassic at about 4700 m followed by the Late Jurassic Dogger, the gas producing Portlandian dolomite, Purbeckian-Waeldian sandstone, and Valanginian-Neocomian limestone and dolomite, followed by the Albian-Aptian marls and limestones.〔Winnock, E., and Pontalier, Y., 1970, Lacq Gas Field, France, AAPG Memoir 14: Geology of Giant Petroleum Fields, Tulsa: AAPG, pp. 375-378.〕

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