Hartzog Draw, new giant oil field

Conference · Wed Mar 01 04:00:00 EST 1978 · Am. Assoc. Pet. Geol., Bull.; (United States)

OSTI ID:6784559

Martinsen, R S; Tillman, R W

Hartzog Draw field in the Powder River Basin, Wyoming, was discovered in Aug. 1975. It is one of the largest oil fields discovered in the Rocky Mt. province in recent years, with initial estimates of ultimate recovery exceeding 100 million bbl of oil. Field development through the fall of 1977 extended more than 20 miles (32 km) lengthwise in a northwest to southeast direction and up to 3 miles (5 km) in width, encompassing in excess of 22,000 productive acres (8,800 ha). Development drilling on 160-acre (64 ha) spacing has had a better than 95% success rate and intial production rates commonly exceed 1,000 bopd. Several wells have had initial potential greater than 3,000 bpd. Production at Hartzog Draw is from the Upper Cretaceous Shannon Sandstone Member of the Cody Shale, at a depth of 9,000 to 9,600 ft (2,700 to 2,900 m). Oil accumulation is stratigraphically controlled, the structure having almost no influence on entrapment. The reservoir sandstones (mostly marine central bar and bar margin facies) are described.

• Research Organization: Cities Service Oil Co
• OSTI ID: 6784559
• Report Number(s): CONF-7804139-
• Conference Information: Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 62:3
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
020300 -- Petroleum-- Drilling & Production
DRILLING
FEDERAL REGION VIII
GEOLOGIC DEPOSITS
GEOLOGY
MINERAL RESOURCES
NORTH AMERICA
OIL FIELDS
PETROLEUM DEPOSITS
RESERVOIR ROCK
RESOURCE POTENTIAL
RESOURCES
STRATIGRAPHY
USA
WELL DRILLING
WELL SPACING
WYOMING