Reservoir compartmentalization caused by mass transport deposition Northwest Stevens pool, Elk Hills Naval Petroleum Reserves, California

Conference · Mon Jan 01 04:00:00 EST 1996 · AAPG Bulletin

OSTI ID:6857684

Milliken, M D; McJannet, G S ^[1]; Shiflett, D W ^[2]; Deutsch, H A ^[3]

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1. Dept. of Energy, Tupman, CA (United States)
2. Intera Petroleum Technology, Inc., Bakersfield, CA (United States)
3. Bechtel Petroleum Operations, Inc., Tupman, CA (United States); and others

The [open quotes]A[close quotes] sands of the Northwest Stevens Pool consist of six major subdivisions (A1-A6) and numerous sublayers. These sands are above the [open quotes]N Point[close quotes] stratigraphic marker, making them much younger than most other Stevens sands at Elk Hills. Cores show the A1-A3 sands to be possibly mass transport deposition, primarily debris flows, slumps, and sand injection bodies. The A4-A6 sands are characterized by normally graded sheet-like sand bodies Hospital of traditional outer fan turbidite lithofacies. Most current production from the A1-A2 interval comes from well 373A-7R, are completed waterflood wells that came on line in 1992 at 1400 BOPD. Well 373A-7R is an anomaly in the A1-A2 zone, where average production from the other ten wells is 200 BOPD. Other evidence for compartmentalization in the A1-A2 interval includes sporadic oil-water contacts and drawdown pressures, difficult log correlations, and rapid thickness changes. In 1973, well 362-7R penetrated 220 ft of wet Al sand. The well was redrilled updip and successfully completed in the A1, where the oil-water contact is more than 130 ft lower than the original hole and faulting is not apparent. In 1992, horizontal well 323H-7R unexpectedly encountered an entirely wet Al wedge zone. Reevaluation of the A1-A3 and other sands as mass transport origin is important for modeling initialization and production/development strategies.

• OSTI ID: 6857684
• Report Number(s): CONF-960527--
• Conference Information: Journal Name: AAPG Bulletin Journal Volume: 5
• Country of Publication: United States
• Language: English

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