【摘 要】
：
Influenced by neo-tectonic movement,the Sanhu area of China\'s Qaidam Basin formed in the Quaternary in response to migration of its depocentre.A study of core material from the Qijia 1 Well reveals novel Quaternary aqueously deposited aeolian sandstone
【机 构】
：
School of Energy Resources, China University of Geosciences, Beijing 100083, China;Key Laboratory of
论文部分内容阅读
Influenced by neo-tectonic movement,the Sanhu area of China\'s Qaidam Basin formed in the Quaternary in response to migration of its depocentre.A study of core material from the Qijia 1 Well reveals novel Quaternary aqueously deposited aeolian sandstones in the Qigequan Formation of the Sanhu area.Here we report the sedimentary petrology and geochemistry data of these deposits that constrain their depositional history.Evidence for aeolian influence during deposition includes:sorting and roundness,pure quartz sand with single mode grain size distribution and few suspension materials,very fine sand grain size distribution indicating sorting by saltation and suspension transport,dish-shaped and crescentshaped pits in grain surfaces indicating aeolian transport and chemical composition similar to that observed in active or recent dune deposits,namely enrichment in SiO2,Na2O,and MgO relative to the sand dam sediment in the lakeshore.Identification of these aqueously deposited aeolian sandstones expands the range of sedimentary deposit types found in the Sanhu area and improves understanding of its paleoclimatic history.
其他文献
Wellbore failure can occur at different stages of operations.For example,wellbore collapse might happen during drilling and/or during production.The drilling process results in the removal of an already stressed rock material.If the induced stresses near
Less than 10％ of oil is usually recovered from liquid-rich shales and this leaves much room for improvement,while water injection into shale formation is virtually impossible because of the extremely low permeability of the formation matrix.Injecting carb
The most prominent aspect of multiphase flow is the variation in the physical distribution of the phases in the flow conduit known as the flow pattern.Several different flow pattems can exist under different flow conditions which have significant effects
Diffusion is an important mass transfer mode of tight sandstone gas.Since nano-pores are extensively developed in the interior of tight sandstone,a considerable body of research indicates that the type of diffusion is mainly molecular diffusion based on F
The paper presents a novel hydraulic fracturing model for the characterization and simulation of the complex fracture network in shale gas reservoirs.We go beyond the existing method that uses planar or orthogonal conjugate fractures for representing the
Deep-water deposition is a current issue in sedimentological research.Sandy-debris-flow sandstones and turbidity-current sandstones are the main types of sandstone that are the focus of considerable disputes in this research.Previous studies mainly focuse
The Lower Cretaceous Xiagou Formation contains the major source rocks for the crude oils discovered in the Qingxi Sag and the South Uplift in the Jiuquan Basin,northwestern China.The Xiagou Formation source rock was formed in a closed,anoxic,reducing,alka
A significant fraction of the conventional oil reserves globally is in carbonate formations which contain a substantial amount of residual oil.Since primary and secondary recovery methods fail to yield above 20％-40％ of original oil in place from these res
The pyromellitic dianhydride (PMDA) crosslinked poly(vinyl alcohol) (PVA) was coated on top of the PAN ultrafiltration membrane to form a PVA/PAN composite PV membranes for wastewater desalination.The composite membranes have high application value in ind
The stability of petroleum coke water slurry (PCWS) is currently a hot topic.The inherent relationship between yield stress and stability of bubble-PCWS was studied through orthogonal experiments and range analysis in this work.The results showed that the