Changes in physical properties of a reservoir sandstone as a function of burial depth – The Etive Formation, northern North Sea

Fluid overpressure as a control on sandstone reservoir quality in a mechanical compaction dominated setting: Magnolia Field, Gulf of Mexico

“…Generally, oil emplacement and clay grain coats play a role in porosity preservation mainly in the chemical compaction regime at temperatures greater than ~70 °C (e.g. Bruce, ; Marcussen et al ., ; Bjorlykke, ). Moreover, these factors tend to affect the diffusion and precipitation rates of diagenetic cements, and therefore the duration of time that the sediments are in the chemical compaction regime is also vital (Worden et al ., ; Worden and Morad, ).…”

Diagenetic characteristics and reservoir quality in tight gas sandstones: A case study of the Shanxi Formation in the north‐eastern Ordos Basin, China

“…The frequently observed micro‐stylolites around the detrital grains on CL images reflect chemical compaction or pressure dissolution occurring in the Shanxi Formation tight sandstones that could have been a potential silica source for authigenic quartz (Figure a,b). Silica dissolved along micro‐stylolites can transport to the grain surface by diffusion and precipitate as quartz overgrowth (Bjørlykke & Jahren, ), and these quartz cements can stabilize the intergranular volume in deep burial and reduce the loss of pore volume during mechanical compaction (Marcussen, Maast, Mondol, Jahren, & Bjørlykke, ; Paxton, Szabo, Ajdukiewicz, & Klimentidis, ). Some intergranular pores surrounded by quartz overgrowths were preserved in the Shanxi Formation sandstones, suggesting that this authigenic quartz was formed by pressure dissolution (Figure d).…”

“…Silica dissolved along micro-stylolites can transport to the grain surface by diffusion and precipitate as quartz overgrowth (Bjørlykke & Jahren, 2012), and these quartz cements can stabilize the intergranular volume in deep burial and reduce the loss of pore volume during mechanical compaction (Marcussen, Maast, Mondol, Jahren, & Bjørlykke, 2010;Paxton, Szabo, Ajdukiewicz, & Klimentidis, 2002). Some intergranular pores surrounded by quartz overgrowths were preserved in the Shanxi Formation sandstones, suggesting that this authigenic quartz was formed by pressure dissolution (Figure 5d).…”

Special issue introduction: Compaction processes – Porosity, permeability and rock properties evolution in sedimentary basins

“…The papers cover many aspects of sediment compaction q The papers presented in this special issue is based on presentations given at a special symposium called Compaction processes -porosity, permeability and rock properties evolution in sedimentary basins -a tribute to Knut Bjørlykke at the 33rd International Geological Congress (IGC) held in Oslo, Norway, 6-14 August, 2008. related processes in sandstones, shales and carbonates. The papers range from theoretical considerations to experimental studies (Fawad et al, 2010), to descriptive and analytical studies mostly based on natural data (Croizé et al, 2010;Hammer et al, 2010;Dutton and Loucks, 2010;Marcussen et al, 2010;Souque et al, 2010;Thyberg et al, 2010;Yang and Aplin, 2010). Bjørlykke et al (2010) show that prediction of overpressure in sedimentary basins is extremely difficult and requires prior geological knowledge about the detailed sediment heterogeneity with respect to primary sedimentary facies, diagenesis and tectonic development.…”

“…The amount and distribution of grain crushing in tectonically active systems is central in this work. Marcussen et al (2010) describes both experimental mechanical compaction and chemical compaction as deviation from mechanical compaction from the Jurassic North Sea Brent Group Etive sandstone. The study shows that results from experimental compaction can be used to predict reservoir properties at shallow burial depths.…”