Detail Sedimentology and sequence stratigraphy of the lower Cretaceous Clearwater Formation, Cold Lake, Alberta Bibliografi Author: McCrimmon, G. Glen ; Arnott, R. William (Advisor) Topik: GEOLOGY Bahasa: (EN )    ISBN: 0-612-15648-6     Penerbit: University of Ottawa Press     Tahun Terbit: 1996     Jenis: Theses - Dissertation Fulltext: MM15648.pdf (0.0B; 0 download) Abstract The lower Cretaceous (Aptian to Albian) CLearwater Formation at Cold Lake, Alberta contains a complex assemblage of silicicastic strata. On the basis of detailed core analyses, Clearwater Formation strata have been subdivided into eight lithofacies and six recurring, facies associations. These facies associations are: (1) Tidal bar, (2) Sand flat, (3) Tidal-fluvial channel, (4) Fluvial channel, (5) Shoreface to foreshore, and (6) Offshore. Correlation of the facies associations and their bounding time-significant surfaces has led to the interpretation that Clearwater Formation strata are marine and tidally-influenced coastal embayment deposits that comprise four unconformity-bounded depositional sequences (1 to 4). Each sequence is made up of one or more incised valley-fill deposits within a backstepping parasequence set, indicating deposition in the transgressive system tract. The incised valley-fill deposits of each sequence, however, are interpreted a basinward shift of deltaic facies within a larger-scale marine transgression. Together, the four depositional sequences of the Clearwater Formation therefore compose a progradational sequence set. The Clearwater Formation is the primary reservoir unit at the Cold Lake heavy oil sands area with reserves estimated at $11,050/times 10/sp6$ m$/sp3$ of heavy crude bitumen. The distribution of hydrocarbons is related primarily to the distribution of reservoir quality strata and positive structure. Strata of facies associations 2 (sand flat) and 4 (fluvial channel) are observed to have the best reservoir quality. In the study area these strata occur in each of the upper three depositional sequences but are most abundant in sequences 3 and 4. The spatial distribution of reservoir-quality strata in Sequence 2 is such that additional hydrocarbon deposits are inferred to exist south of the study area, along the axis of the incised valley trend. Furthermore, northwest of the study are, Sequence 4 probably contains additional reservoir-quality strata along the trend of its incised valleys. Opini Anda Klik untuk menuliskan opini Anda tentang koleksi ini! Lihat Sejarah Pengadaan  Konversi Metadata   Kembali

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