Structural deformation in the offshore Santa Maria basin, California

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

OSTI ID:5199328

Willingham, C R ^[1]; Heck, R G ^[2]; Rietman, J M ^[3]

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1. Explorametrics, Carpinteria, CA (United States)
2. R.G. Heck and Associates, Carpinteria, CA (United States)
3. Rietman Consultants, Santa Ana, CA (United States)

The authors divide the offshore Santa Maria basin into the southern, central, and northern provinces based on the pattern, style, and timing of late Cenozoic deformation. From their analyses of over 2,000 km of CDP seismic data and offshore well data they prepared time structure contour maps for three basin-wide unconformities: top of basement, top of Miocene, and the unconformity between early and late Pliocene chronostratigraphic units. Isochron maps were constructed between these horizons and between the early/late Pliocene unconformity and the sea floor to evaluate timing of the deformation. All maps were converted to depth and isopach values based on a three-dimensional velocity model. The regional structure contour and isopach maps show that the offshore Santa Maria basin is characterized by localized crustal shortening orthogonal to the Pacific/North America plate margin and indications of post-Miocene to recent lateral slip along the eastern basin boundary, the San Simeon/Hosgri fault system.

• OSTI ID: 5199328
• 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

58 GEOSCIENCES
580000* -- Geosciences
CALIFORNIA
CENOZOIC ERA
DEFORMATION
DEVELOPED COUNTRIES
GEOLOGIC AGES
GEOLOGIC MODELS
GEOLOGIC STRUCTURES
GEOLOGY
MAPPING
MIOCENE EPOCH
NORTH AMERICA
OFFSHORE SITES
PLIOCENE EPOCH
ROCKS
SEDIMENTARY BASINS
SEDIMENTARY ROCKS
STRATIGRAPHY
TECTONICS
TERTIARY PERIOD
USA