Sequences, systems tracts, and eustatic cycles
Conference
·
· AAPG Bull.; (United States)
OSTI ID:5797430
Depositional sequences are composed of genetically related sediments bounded by unconformities or their correlative conformities and are related to cycles of eustatic change. The bounding unconformities are inferred to be related to eustatic fall inflection points. They will be either Type 1 or Type 2 unconformities depending on whether sea level fall was rapid (i.e., rate of eustatic fall exceeded subsidence rate at the depositional shoreline break) or slow (i.e., rate of eustatic fall was less than subsidence rate at the depositional shoreline break). Each sequence is comprised of a succession of systems tracts. Four systems tracts are recognized: lowstand, transgressive, highstand, and shelf margin systems tracts. The lowstand systems tract is subdivided into two parts: lowstand fan and lowstand wedge where the basin margin is characterized by a discrete physiographic shelf edge, or lower and upper wedge where the basin margin is characterized by a ramp physiography. Each systems tracts is comprised of a linkage of contemporaneous depositional systems.
- Research Organization:
- Esso Resources Canada, Ltd., Calgary, Alberta
- OSTI ID:
- 5797430
- Report Number(s):
- CONF-880301-
- Conference Information:
- Journal Name: AAPG Bull.; (United States) Journal Volume: 72:2
- Country of Publication:
- United States
- Language:
- English
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