Sequence stratigraphic analysis of stratigraphic oil traps in the west Siberian Neocomian
- IGIRGI, Moscow (Russian Federation)
- Mobile Exploration and Producing Technical Center, Dallas, TX (United States)
Large depositional oil traps (Priob, Sugmut, etc.) have been discovered in the West Siberian Neocomian. Sequence stratigraphic analysis of well logs and seismic reflection profiles demonstrate that reservoirs of these fields represent sands deposited during lowstand, transgressive and highstand phases of relative sea level cycles. Transgressions and regressions advanced in regional longitudinal and local latitudinal directions. The regional longitudinal pattern is dominated by westward prograding clinoforms formed as the sediment supply exceeded the accommodation space. Local northward and northwestward prograding complexes appear to be controlled by local basin-floor topography. In each systems tract, the coastal zones were landward from the shelf-breaks resulting in dominance of marine facies at each depositional shelf-edge. Lowstand systems tracts are represented on the upper slope by prograding wedges with thin shelfal equivalents or correlative unconformities. Sands deposited in these lowstand regressive facies comprise the main reservoir at Sugmut and a subordinate reservoir at Priob. Transgressive systems tracts are dominantly shale but in the Priob field one early transgressive parasequence sand contains an oil accumulation where it immediately overlies a highstand shelf sand. Highstand systems tracts are represented by regional sheets over the shelf and by thick progradational complexes over the upper slope. Most of the sands occur within the late highstand parasequences and are difficult to correlate due to channel incision. Most Priob field reserves occur in the late highstand parasequences.
- OSTI ID:
- 6862741
- Report Number(s):
- CONF-960527-; CODEN: AABUD2
- Journal Information:
- AAPG Bulletin, Vol. 5; Conference: Annual convention of the American Association of Petroleum Geologists, Inc. and the Society for Sedimentary Geology: global exploration and geotechnology, San Diego, CA (United States), 19-22 May 1996; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Sequence stratigraphic setting of the Priob Field within the Neocomian prograding complex of the West Siberian Basin, Russia
Sugmut field: A forced regression deposit within the Neocomian prograding clinoform complex, West Siberian Basin, Russia
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