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1.
Evidence for focused hot fluid flow within the Britannia Field, offshore Scotland, UK 总被引：1，自引：0，他引：1
S. G. Archer H. L. Wycherley G. R. Watt M. L. Baron J. Parnell H. Chen 《Basin Research》2004,16(3):377-395
Fluid inclusion and scanning electron microscope‐cathodoluminescence evidence indicates focused hot, saline, diagenetic fluid flow within the Eastern Flank of the Britannia Field, offshore Scotland, UK. The fluid was sourced from the Andrew Salt Dome, 10 km to the east. The fluids, which promoted quartz cementation of the upper zones within the field, were up to ～30°C hotter and had salinities up to ～10 wt% NaCl equivalent higher than fluids from lower in the reservoir section. During diagenesis hot saline fluids migrated westwards as part of a radiating ‘diagenetic front’ from the Andrew Salt Dome. Structural dip associated with the Eastern Flank of the Fladen Ground Spur impeded the westward movement of the diagenetic fluid. The quartz cements from the upper and lower reservoir zones can be distinguished by morphology. In the upper zones the quartz cements have well‐developed macro‐crystalline zoning and heterogeneous luminescence across the grain. In the lower zones, the cements are much less developed, unzoned and very weakly luminescent. The diagenetic fluids were primarily focused into Zone 45 within the upper reservoir. Furthermore, within the Main Platform Area the most prolific producing zone is Zone 45, indicating the importance of this interval as a permeable flow unit during both diagenetic and production timescales. Within the Eastern Flank, the quartz overgrowths have a major impact on reservoir permeability and thus well productivity. The overgrowths are most extensive in the originally clean sandstones with low clay content. Clay in optimum volumes (5–10%) can inhibit nucleation of the damaging quartz overgrowths without having a detrimental effect on pore connectivity. These observations provide a predictive concept for use in the search for relative reservoir sweetspots within the degraded Eastern Flank. 相似文献
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Lauren E. Watt Phil A. Bland Dave J. Prior Sara S. Russell 《Meteoritics & planetary science》2006,41(7):989-1001
Abstract— Fabric analysis of the interstitial matrix material in primitive meteorites offers a novel window on asteroid formation and evolution. Electron backscatter diffraction (EBSD) has allowed fabrics in these fine‐grained materials to be visualized in detail for the first time. Our data reveal that Allende, a CV3 chondrite, possesses a uniform, planar, short‐axis alignment fabric that is pervasive on a broad scale and is probably the result of deformational shortening related to impact or gravitational compaction. Interference between this matrix fabric and the larger, more rigid components, such as dark inclusions (DIs) and calcium‐aluminium‐rich inclusions (CAIs), has lead to the development of locally oriented and intensified matrix fabrics. In addition, DIs possess fabrics that are conformable with the broader matrix fabric. These results suggest that DIs were in situ prior to the deformational shortening event responsible for these fabrics, thus providing an argument against dark inclusions being fragments from another lithified part of the asteroid (Kojima and Tomeoka 1996; Fruland et al. 1978). Moreover, both DIs and Allende matrix are highly porous (?25%) (Corrigan et al. 1997). Mobilizing a highly porous DI during impact‐induced brecciation without imposing a fabric and incorporating it into a highly porous matrix without significantly compacting these materials is improbable. We favor a model that involves Allende DIs, CAIs, and matrix accreting together and experiencing the same deformation events. 相似文献
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Silvana M. Barbanti J. Michael MoldowanDavid S. Watt E. Kolaczkowska 《Organic Geochemistry》2011,42(4):409-424
Certain biomarkers in petroleum provide information on of the geologic age of its source rock and these can also be used to track the evolution, radiation and relationships between taxa and as proxies for paleoenvironmental reconstruction. Triaromatic 23,24-dimethylcholesteroids (TA-DMC), which undoubtedly derive from 23,24-dimethylcholesterols in dinoflagellates, haptophytes and diatoms, provide a useful parameter to distinguish Paleozoic from Mesozoic and younger oil and rock extracts at higher specificity than previously proposed biomarkers. In this report, we present a study of the relative abundance of a novel series of TA-DMC in source rock extracts and crude oil from different global localities and ages. Based on their taxon specificity for important primary producers, such biogeochemicals also have implications for paleoenvironmental studies, including paleoclimate and global change, such as radiations following the Permian-Triassic boundary mass extinction. 相似文献
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