Petrology and reservoir quality of Oligocene to Albian sandstones and grainstones recovered at Ocean Drilling Program Site 1276 off the Newfoundland margin

Author(s): Marsaglia, Kathleen M.; Lyles, Ilia C.; Maloney, Sara J.
Author Affiliation(s): Primary:
California State University Northridge, Northridge, CA, United States
Volume Title: AAPG 2005 annual convention; abstracts volume
Source: Abstracts: Annual Meeting - American Association of Petroleum Geologists, Vol.14, p.A87; AAPG 2005 annual convention, Calgary, AB, Canada, June 19-22, 2005. Publisher: American Association of Petroleum Geologists and Society for Sedimentary Geology, Tulsa, OK, United States
Note: In English
Summary: Ocean Drilling Program (ODP) Leg 210 drilled the western half of a Newfoundland-Iberian conjugate-margin transect. At ODP Site 1276, the goal was to drill through the drift succession into synrift deposits. Only part of the drift history was successfully cored, but it contained a surprising quantity and variety of sandy gravity flow deposits within a nearly continuous record of Oligocene to Albian sedimentation. These deposits provide some insight into the petrology and reservoir potential of possible counterparts in upslope sections on this segment of the Newfoundland margin. Thin sections were prepared from 114 samples of Site 1276 gravity deposits, which were first impregnated with blue-dyed epoxy for porosity recognition. The samples are complex mixtures of sand-sized terrigenous and carbonate debris and thus range from sandstone to grainstone end members. Possible sources of sand-sized material include: 1) the continental margin to the southwest (Avalon Uplift) and north (Flemish Cap); 2) extrabasinal sources from the northern gateway and/or the conjugate Iberian margin; 3) intrabasinal basement highs; 4) and the Newfoundland Seamounts to the south. Gravity deposits in the Cenozoic section are dominantly composed of biogenic debris, with lesser terrigenous components and glauconite. Carbonate cement is pervasive to common with microporosity limited to bioclasts and matrix. Where spiculitic, there is development of secondary porosity and opaline to chalcedonic cements. In general, underlying Cretaceous gravity deposits contain more terrigenous debris, are cemented by poikilotopic carbonate, and exhibit evidence of secondary dissolution of feldspar grains. Locally, cement is absent and intragranular primary porosity is preserved.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 29 Economic Geology, Energy Sources; Canada; Carbonate rocks; Cenozoic; Clastic rocks; Continental margin; Eastern Canada; Grainstone; Leg 210; Newfoundland; Newfoundland and Labrador; ODP Site 1276; Ocean Drilling Program; Oligocene; Paleogene; Reservoir properties; Sandstone; Sedimentary rocks; Tertiary
Coordinates: N452400 N452400 W0444700 W0444700
Record ID: 2009047874
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data supplied by American Association of Petroleum Geologists, Tulsa, OK, United States