Ancient Aeolian Reservoirs of the East Siberia Craton

Fine-grained strata deposited on the Eastern Siberian craton are predominantly considered to mainly consist of Neoproterozoic sandstones. Clastic rocks near unconformity border Ediacaran and Riphean represented by sandstone siltstone layers with thicknesses several tens meters, belonging Nepa, Tira, Byuk horizons in Nepa–Botuoba region. These sandstones have features characteristic aeolianites formed under action high wind velocity period. Sandstone samples Riphean–Ediacaran boundary were collected from five deep wells characterized for granulometry mineral composition using optical microscopy, XRD, SEM, ICP-MS techniques. a proportion quartz (60–98%) minor amounts feldspars, carbonate, sulfate cements. Thin sections sandy feature bimodal distributions grains throughout many sections, large well-rounded being orders magnitude greater than silt matrix grains. The monomineralic an overgrowth can be petroleum reservoirs good porosity permeability, but most studied intervals, content anhydrite dolomite interstitial cement significantly reduces both. is low, while permeability very which may associated significant amount clay material. Aeolianites normally contain (due its stability resistance weathering) possess presence heavy minerals.