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- W2129632019 abstract "The Vedder-Jewett sands represent a retrogradational parasequence set forming a seismically defined, 1500-ft thick transgressive systems tract (TST) that was deposited in a ramp setting on the eastern margin of the San Joaquin basin. This interval has produced 656.5 MMBO and 221.9 BCFG, largely from fault-bounded traps. Due to basin subsidence, the underlying highstand nonmarine Walker was transgressed and overlain by nonmarine and marine deposits of the Vedder and Jewett sands. Seismic, well-log, and core data indicate that parasequences in the upward-deepening TST are comprised of alluvial, fluvio-deltaic, and shallow-marine facies. Each parasequence is punctuated by marine-transgressive episodes. This TST is manifested as a succession of backstepping and aggradational seismic reflections becoming progressively more transparent upward. Geologically defined parasequences and stratigraphic discontinuities are seismically detectable because of impedance contrasts between marine and nonmarine sediments at marine-flooding surfaces. Reflection amplitude loss coincides with a sandstone-to-shale facies change within a parasequence and, therefore, is a good estimate of lithosome continuity. Parasequences and their bounding surfaces in the TST have diagnostic sedimentologic and biostratigraphic signatures. Low benthonic foraminiferal abundances characterize shallow-marine deposition; abundances increase to a maximum at the seismic downlap surface (maximum flooding surface). Dinoflagellate occurrences accurately record the transgressive episodes, especiallymore » in the predominantly nonmarine lower TST.« less" @default.
- W2129632019 created "2016-06-24" @default.
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- W2129632019 date "1991-01-01" @default.
- W2129632019 modified "2023-09-24" @default.
- W2129632019 title "Integrated Analysis of Parasequences in an Oligocene Transgressive Systems Tract: San Joaquin Basin, California" @default.
- W2129632019 doi "https://doi.org/10.1306/0c9b102f-1710-11d7-8645000102c1865d" @default.
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