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Mancini, E.A., Parcell, W.C., Puckett, T.M., and Llinas, J.C., 2001:Topical Report 4,Basin and Petroleum Migration Modeling of the Mississippi Interior Salt Basin, U.S. Department of Energy Report, 50 p.
Abstract
Basin and petroleum migration modeling has been performed in the Mississippi Interior Salt Basin. The tectonic and depositional histories of the basin form the foundation for the modeling. Basin modeling indicates that the variation in sediment accumulation rate is related to lithology, unit thickness and duration of deposition. The highest mean sediment accumulation and tectonic subsidence rates are recorded for Upper Jurassic and Lower Cretaceous strata.
Thermal maturity modeling was accomplished utilizing vitrinite reflectance, thermal alteration index, Tmax, bottomhole temperature, type of kerogen, and total organic carbon data. Maturity modeling indicates that Upper Jurassic Smackover carbonate mudstones (rich in micro-bial kerogen) were effective regional source rocks throughout the basin. Oil generation com-menced from these mudstones in the Early to Late Cretaceous and continued into the Tertiary. Upper Cretaceous Tuscaloosa black shales (rich in herbaceous kerogen) were effective local source rocks in parts of the basin. Oil generation was initiated from these shales in the early Tertiary. The burial and thermal histories of the Tertiary shales were not conducive for the generation of hydrocarbons in this basin.
Smackover hydrocarbon expulsion commenced during the Early to Late Cretaceous and continued into the Tertiary from carbonate mudstones in the south-central basinal area and in the central portions of the basin. Smackover hydrocarbon migration was initiated in the Early Creta-ceous and was maximized in the Late Cretaceous. Hydrocarbon flow patterns were initially from the south-central portion of the basin northward into salt anticlinal features and westward and southward along the Wiggins Arch and from the basin center westward into salt structures and northward updip and along the Pickens-Gilbertown fault systems. In the Late Cretaceous, hydro-carbons migrated from the basin center eastward into salt anticlines and along the Mobile Graben.
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