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Line 25: − − ==Geologic setting== − SP62 field lies on the south rim of a large, salt-withdrawal minibasin (Cheetah minibasin, [[:file:Mth14ch04f01.jpg|Figure 1]]). The south rim is defined by a large, pressure-changing, north-dipping, counterregional fault. The north flank is defined by a series of arcuate, regional, south-dipping faults.
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South Pass 62 field, lying 50 km southeast of the Mississippi River delta in 100 m of water ([[:file:Mth14ch04f01.jpg|Figure 1]]), was discovered in 1965. It was developed with 61 directionally drilled wells from three platforms in the late 1960s, redeveloped from 1986 to 1988 with 31 wells from a fourth platform, and redeveloped again from 1994 to 1997 with horizontal and directionally drilled slim-hole sidetracks ([[:file:Mth14ch04f02.jpg|Figure 2]], [[:file:Mth14ch04f03.jpg|Figure 3]]). A 3-D seismic-based field study completed in 1994 identified reservoir targets for the horizontal-drilling program. Cumulative production from block 62 is 108 MMBO and 170 BCFG. Peak daily production rates reached 30,000 bbl and 50 MMCFG in 1970 before declining to 2000 bbl in 1994.
South Pass 62 field, lying 50 km southeast of the Mississippi River delta in 100 m of water ([[:file:Mth14ch04f01.jpg|Figure 1]]), was discovered in 1965. It was developed with 61 directionally drilled wells from three platforms in the late 1960s, redeveloped from 1986 to 1988 with 31 wells from a fourth platform, and redeveloped again from 1994 to 1997 with horizontal and directionally drilled slim-hole sidetracks ([[:file:Mth14ch04f02.jpg|Figure 2]], [[:file:Mth14ch04f03.jpg|Figure 3]]). A 3-D seismic-based field study completed in 1994 identified reservoir targets for the horizontal-drilling program. Cumulative production from block 62 is 108 MMBO and 170 BCFG. Peak daily production rates reached 30,000 bbl and 50 MMCFG in 1970 before declining to 2000 bbl in 1994.
==Geologic setting==
SP62 field lies on the south rim of a large, salt-withdrawal minibasin (Cheetah minibasin, [[:file:Mth14ch04f01.jpg|Figure 1]]). The south rim is defined by a large, pressure-changing, north-dipping, counterregional fault. The north flank is defined by a series of arcuate, regional, south-dipping faults.
<gallery mode=packed heights=300px widths=300px>
<gallery mode=packed heights=300px widths=300px>
file:Mth14ch04f03.jpg|{{figure number|3}}South Pass 62 field base map. Eleven horizontal wells and sidetracks were drilled between 1993 and 1997.
file:Mth14ch04f03.jpg|{{figure number|3}}South Pass 62 field base map. Eleven horizontal wells and sidetracks were drilled between 1993 and 1997.
</gallery>
</gallery>
Basin formation began in the early Miocene in response to sediment loading. As the ancestral Mississippi River deposited sediment in the north, mobile salt was forced southward into a salt ridge. This ridge provided a backstop for early Miocene turbidites cascading down the continental slope. Continued deposition resulted in further loading, continued salt-ridge growth, and eventual rupture of the overlying Eocene chalk along the ridge crest. Salt, squeezed out of the ridge, localized into a dome at SP62.
Basin formation began in the early Miocene in response to sediment loading. As the ancestral Mississippi River deposited sediment in the north, mobile salt was forced southward into a salt ridge. This ridge provided a backstop for early Miocene turbidites cascading down the continental slope. Continued deposition resulted in further loading, continued salt-ridge growth, and eventual rupture of the overlying Eocene chalk along the ridge crest. Salt, squeezed out of the ridge, localized into a dome at SP62.