Sökning: "Sandstone"

Visar resultat 1 - 5 av 32 avhandlingar innehållade ordet Sandstone.

  1. 1. Compositional controls on sandstone diagenesis

    Författare :Luiz Fernando De Ros; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  3. 2. Diagenesis and Reservoir-Quality Evolution of Paralic, Shallow Marine and Fluvio-lacustrine Deposits : Links to Depositional Facies and Sequence Stratigraphy

    Författare :Osama Ahmed Hlal; Sadoon Morad; Hans Annersten; J. Marcelo Ketzer; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Sandstone; Diagenesis; paralic; shallow marine and fluvio-lacustrine; reservoir quality; sequence stratigraphy; Solid earth geology and petrology; Berggrundsgeologi och petrologi;

    Sammanfattning : Linking diagenesis to depositional facies and sequence stratigraphy enables better prediction of spatial and temporal distribution of diagenetic alterations, and thus of evolution of reservoir quality in sandstones. This thesis demonstrates that employing this approach is possible because depositional facies and sequence stratigraphy can provide useful information on parameters controlling the near-surface diagenesis, such as changes in: (i) pore-water chemistry, (ii) residence time of sediments under certain geochemical conditions, (iii) detrital composition and proportion of extra- and intra-basinal grains, and (iv) types and amounts of organic matter. LÄS MER

  4. 3. Mineral diagenesis and petrology of the Dala Sandstone, central Sweden

    Författare :Ala Aldahan; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The Dala Sandstone, of Proterozoic age, is the most extensive sedimentary unit in central Sweden. The rocks are quartz sandstones, lithic sandstones, feldspathic sandstones, arkoses and greywackes with intercalations of shales and siltstones less than 1 m thick. The Öje Basalt divides the sedimentary sequence into two parts. LÄS MER

  5. 4. Fluid inclusion studies of the Laisvall sandstone lead-zinc deposit, Sweden

    Författare :Sten Lindblom; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The ore forming environment at Laisvall was characterized by a total salt content of 24 eq. wt-% NaCl with as much as 9 wt-% CaCl2. Its temperature fluctuated between 180°C and 120°C but generally decreased with time. The cementing mineral assemblage was deposited in the general sequence calcite, barite, fluorite, galena, sphalerite. LÄS MER

  7. 5. Dissolution mechanisms of albite and hornblende and of calcite in sandstone

    Författare :Paul Frogner; Stockholms universitet; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER