Abstract Higher oil recovery after waterflood in carbonate reservoirs is attributed to increasing water wettability of the rock that turn relies on complicated surface chemistry. In addition, calcite mineral reacts with aqueous solutions and can alter substantially composition injected by dissolution. Carefully designed chemical and/or brine flood compositions laboratory may not remain intact w...

-Inorganic chemical analyses and short-chain aliphatic acid content are used to interpret the origin and compositional evolution of formation waters in the Alberta portion of the Western Canada Sedimentary Basin. Forty-three formation water samples were obtained covering a stratigraphic interval from Devonian to Cretaceous. The data show that: (1) there is a subaerially evaporated brine compone...

Abstract Using observations and descriptions of drilling cores, image logging, microscopic section, argon ion polishing field emission scanning electron microscopy, X-ray diffraction, whole-rock trace element analysis, the study shale reservoir diagenesis space types in Fengcheng Formation Mahu Sag was conducted. Considering contents their ratios (Sr/Ba, V/Ni, Th/U, V/(V + Ni), U/Mo, Sr/Cu), is...

Since their first occurrence in the late Cretaceous, seagrasses have played a major role carbonate production and sedimentation across shallow-water nearshore environments, sustaining prolific factory contributing to sediment accumulation through combination of baffling trapping effects. Most reported Palaeogene seagrass occurrences developed oligo−mesotrophic shallow warm-water habitats are ch...

The Frasnian carbonate-siliciclastic deposits of the Stipinai Formation exposed in two quarries at Petraši?nai and Klovainiai (northern Lithuania) show considerable vertical facies changes. lower part this succession is dominated by argillaceous dolomitic with subordinate fine siliciclastic deposits. They display haloturbation bioturbation structures, represent a hypersaline lagoonal environmen...

Water saturation determination is one of the most important tasks in reservoir studies to predict oil and gas in place needed to be calculated with more accuracy. The estimation of this important reservoir parameter is commonly determined by various well logs data and by applying some correlations that may not be so accurate in some real practical cases, especially for carbonate reservoirs. Sin...