Hydrocarbon traps within a seismic sequence framework, Stevens turbidites, southern San Joaquin Valley, CA

Conference · Fri Feb 01 04:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5255107

Hewlett, J S; Jordan, D W ^[1]; Crebs, T J; Moorefield, T P ^[2]

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1. ARCO Oil and Gas Co., Plano, TX (United States)
2. ARCO Oil and Gas Co., Bakersfield, CA (United States)

Interpretation of the seismic sequence framework and log and lithologic character of upper Miocene Stevens turbidites on the Bakersfield arch has led to an improved understanding of the expression of stratigraphic trapping that should reduce exploration risk in the basin, and may aid exploration efforts in similar sand-rich systems globally. These deepwater sandstones are contained within three lowstand turbidite systems (LTS) that were deposited in a narrow deepwater basin adjacent to the ancestral Sierra Nevada. the oldest LTS, the Coulter, was transported through several submarine canyons incised into the Fruitvale Shale. In contrast, numerous smaller scale erosional features located on the high-relief slopes of the highstand Santa Margarita deltas, fed the overlying Gosford and Bellevue LTS. The systems consist of sandy, high-density (primarily) and low-density turbidites that were deposited within channel-lobe complexes. On the arch, 472 MMBO and 1.3 tcf have been produced from four seismically detectable traps with strong stratigraphic components: (1) sandstone permeability changes within turbidite wedges that thin rapidly onto structure (2) confined (channelized) turbidites that lap out on a structure (e.g., F-1 sand, South Coles levee), (3) channelized turbidites that pinch out within slope gullies, and (4) depositional compaction anticlines occurring in conjunction with low-gradient regional structure. Condensed section sediments form regional and reservoir-scale seals. Rapid lateral facies changes and grain size variations provide additional seal facies.

• OSTI ID: 5255107
• Report Number(s): CONF-9103128--
• Conference Information: Journal Name: AAPG Bulletin (American Association of Petroleum Geologists); (United States) Journal Volume: 75:2
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CALIFORNIA
CENOZOIC ERA
DEVELOPED COUNTRIES
EXPLORATION
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
GEOLOGIC TRAPS
GEOLOGY
GEOPHYSICAL SURVEYS
LITHOLOGY
MINERAL RESOURCES
MIOCENE EPOCH
NORTH AMERICA
PETROLEUM DEPOSITS
RESOURCES
RISK ASSESSMENT
ROCKS
SANDSTONES
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
SEISMIC SURVEYS
STRATIGRAPHY
SURVEYS
TERTIARY PERIOD
USA