Harmony field, Clarke County, Mississippi: a true stratigraphic trap
Harmony field in Clarke County, Mississippi, has produced approximately 2 million bbl of oil since its discovery in 1968. Production has been from oolitic grainstones in the upper Jurasic Smackover Formation. The trappng mechanism at Harmony field is a complex stratigraphic trap. Porous oolitic grainstones pinch out updip into tight carbonates and anhydrite. Structure contour maps on top of the Smackover Formation indicate a low relief structural nose associated with the field. Additional structure maps contoured at the top of the Haynesville anhydrite, approximately 500 ft (150 m) above the top of the Smackover, reveal only regional southwesterly dip. An isopach map of the interval between the two structural markers shows a thinning of Haynesville section coincident with the field area. Evidence suggests, therefore, that the porous Smackover in Harmony field was deposited with depositional relief above the surrounding sediments. This relief had been completely masked by the time the Haynesville anhydrite was deposited. Stratigraphic and structural cross sections using the Haynesville anhydrite as datum indicate the Smackover in Harmony field consists of not one, but multiple, thin olitic zones which are productive in various portions of the field. These zones grade laterally as well as updip into nonporous anhydritic carbonates. The Smackover Formation is often considered to be a chronolithologic unit. In the Harmony field area it is a lithostratigraphic unit, i.e. a unit defined not by time but by a particular rock type, in this case a porous limestone.
- Research Organization:
- Tesoro Petroleum, Houston, TX
- OSTI ID:
- 6555399
- Report Number(s):
- CONF-8310301-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 67:9; Conference: American Association of Petroleum Geologists eastern section meeting, Carbondale, IL, USA, 3 Oct 1983
- Country of Publication:
- United States
- Language:
- English
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03 NATURAL GAS
MISSISSIPPI
OIL FIELDS
GEOLOGIC TRAPS
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STRATIGRAPHY
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CARBONATE ROCKS
JURASSIC PERIOD
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ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
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FEDERAL REGION IV
GEOLOGIC AGES
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020200* - Petroleum- Reserves
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