Changes

==Geologic setting==

==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.

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>

Faults are prevalent at SP62. Approximately 200 seismically resolvable faults with throws ranging from five to hundreds of meters dissect and compartmentalize the producing horizons. The field is separated into four megacompartments by three major faults: (1) a large, counterregional fault/salt evacuation surface separating the productive north flank from the nonproductive south flank; (2) an arcuate slump defining the north salt face; and (3) a fault system antithetic to the slump. These faults have always been barriers to flow, despite sandstone-on-sandstone juxtaposition across each respective fault.

Faults are prevalent at SP62. Approximately 200 seismically resolvable faults with throws ranging from five to hundreds of meters dissect and compartmentalize the producing horizons. The field is separated into four megacompartments by three major faults: (1) a large, counterregional fault/salt evacuation surface separating the productive north flank from the nonproductive south flank; (2) an arcuate slump defining the north salt face; and (3) a fault system antithetic to the slump. These faults have always been barriers to flow, despite sandstone-on-sandstone juxtaposition across each respective fault.

The mushroom-shaped salt overhang provides an excellent trap at SP62. Hydrocarbon column heights in excess of 900 m are common.

The mushroom-shaped salt overhang provides an excellent trap at SP62. [[Hydrocarbon column]] heights in excess of 900 m are common.

===Stratigraphy and depositional environment===

===Stratigraphy and depositional environment===

Approximately 60 Piocene and Miocene deltaic and turbidite pay sandstones range in depth from 1000 to 6000 m. Horizontal wells focused on seven late Miocene deltaic and shore-face sandstones ([[:file:Mth14ch04f06.jpg|Figure 6]]). Typically, these sandstones were fine grained, well sorted, uncemented, and normally pressured.

Approximately 60 Piocene and Miocene deltaic and turbidite pay sandstones range in depth from 1000 to 6000 m. [[Horizontal well]]s focused on seven late Miocene deltaic and shore-face sandstones ([[:file:Mth14ch04f06.jpg|Figure 6]]). Typically, these sandstones were fine grained, well sorted, uncemented, and normally pressured.

Upper-shoreface sandstones (e.g., M4) typically were 3 to 6 m thick, continuous, upward coarsening, well connected, and easy to correlate. Horizontal wells in these reservoirs were the program's most productive and profitable (C11 and D32). Excellent connectivity and continuity resulted in high rates and good drainage.

Upper-shoreface sandstones (e.g., M4) typically were 3 to 6 m thick, continuous, upward coarsening, well connected, and easy to correlate. Horizontal wells in these reservoirs were the program's most productive and profitable (C11 and D32). Excellent connectivity and continuity resulted in high rates and good drainage.