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Aug 15, 2018 · @article{osti_1558621, title = {In Situ Transmission Electron Microscopy Explores a New Nanoscale Pathway for Direct Gypsum Formation in Aqueous Solution}, author = {He, Kun and Nie, Anmin and Yuan, Yifei and Ghodsi, Seyed Mohammadreza and Song, Boao and Firlar, Emre and Lu, Jun and Lu, Yu-peng and Shokuhfar, Tolou and Megaridis, Constantine M. and Shahbazian-Yassar, Reza}, abstractNote = {In ... Name Gypsum Spring extended into Fort Hill quad, Greater Green River basin, reduced in stratigraphic rank from Gypsum Spring Formation to Gypsum Spring Member, and assigned to Twin Creek Limestone as its basal member. Gypsum Spring was formerly designated member A of Twin Creek by Imlay (1950).Sep 20, 2018 · Conclusions. We report the occurrence of the coupling of gypsum and pyrite from mud sediments of core EC2005, recovered from the inner shelf of the ECS, constraining the sulfur and oxygen sources using the coupled sulfur and oxygen isotopic signals and propose a formation mechanism for nonevaporated gypsum in marine sediments. (1) Jun 25, 2023 · ABSTRACT. Protecting the integrity of the wellbore is a major challenge for the sustainable development of hydrocarbon resources in nitrate formation. In this paper, A numerical model for investigating the effects of casing eccentricity on inclined wellbore integrity in salt-gypsum formation is developed. The effects of creep time, eccentricity distance, cement sheath modulus of elasticity and ... As the main component of the Gachsaran Formation is gypsum and its main contained ions are Ca 2+ and SO 4 −2, the calcium and sulfate concentrations, as well as TDS, were considered to simulate the dissolution rate of the formation. To simulate the reservoir on a daily basis, daily water quality input data should be applied.13 Şub 2020 ... Those close to the mining and construction industries are familiar with gypsum as an important industrial mineral and product, ...The formation of gypsum inside the cylinders is unlikely owing to the high pH values of the pore solution which do not allow the formation of gypsum [13]. Moreover, the stresses for the 30 and 1.5 g/L sulfate solutions are similar although no gypsum precipitation is observed in the latter case, Fig. 6 a. The amounts of ettringite at the ...Assuming that any expansion caused by gypsum formation is negligible, ettringite is the only expansive product. The volumetric change for each chemical reaction in Eqs. (2) , (3) , (4) is calculated by [ 17 , 18 ]: (22) Δ V i V i = M ettr − M i + a i M gyp M i + a i M gyp where M i , M ettr , and M gyp are respectively the molar volumes of ...The formation of gypsum, from concentrated aqueous solutions of calcium sulfate, was thought to be a simple, single-step process. However, a group of European geochemists has now shown that gypsum ...The formation of bassanite from gypsum was sluggish below 323 K and is unlikely to occur under current martian conditions over a diurnal/seasonal cycle from desiccation alone. Dehydration is possible on a localized scale in assocn. with volcanic/impact events although temps. of dehydration and rates of reaction depend on PH2O, particle size ...Gypsum Spring Formation, Nugget Sandstone, and Chugwater Formation (Lower Triassic-Upper Jurassic) at surface, covers < 0.1 % of this area. Gypsum Spring Formation - Interbedded red shale, dolomite, and gypsum. In north Wyoming wedges out south in T. 39 N. Nugget Sandstone (JTRn) - gray to dull-red, crossbedded quartz sandstone.The Yaha gas reservoir in the Kuqa Depression is a condensate gas reservoir with the earliest development time and most mature development technology in China. Its main …Gypsum is a very soft mineral that is easily identified by its hardness, cleavage, and solubility in water. Typically clear to white, gypsum may be colored reddish to brown or yellow if impurities are present. Most gypsum occurs in its massive form, as layers of rock that often intercalate layers of shale, limestone, or dolostone.Gypsum (CaSO4.2H2O, CSH2) is often used to prevent flash set. C310 Nis 2014 ... Selenite from the Greek in allusion to i The determining factors of the formation of a precipitate can vary. Some reactions depend on temperature, such as solutions used for buffers, whereas others are dependent only on solution concentration. ... What is the equilibrium state of this solution with respect to gypsum? Solution. The ion product \[Q_s = (8.4 \times 10^{–5})(7.2 \times ... gypsum mechanically with the ball-mill apparatus, so β-dihy gypsum occur simultaneously. K Serafeimidis established a strict anhydrite-gypsum-water thermodynamic equilibrium equation, proving that gypsum formation caused by water absorption of clay minerals is the main process of sulfate-bearing mineral mudstone expansion. Mudstone contains the structural characteristics of both soil and …Oct 1, 2022 · The two-way flow configuration facilitates the formation of gypsum because it entails a larger inflow of water (and ions) and keeps the salinity below halite saturation (Krijgsman and Meijer, 2008). The presence of gypsum and absence of large volumes of demonstrably in-situ halite in Stage 1 and 3 units ( Roveri et al., 2014a ; Andreetto et al ... The Yaha gas reservoir in the Kuqa Depres

Dec 28, 2007 · The Castile formation consists largely of anhydrite, which is marked throughout by thin, light and dark laminae that may be varves. 16 These laminae are best seen in well cores, but appear also in all reasonably fresh exposures of the formation, even where the rock has altered to gypsum. The light-colored laminae are relatively pure anhydrite ... Sep 9, 2023 · It is commonly found in sedimentary rock formations and is often associated with other minerals such as anhydrite, halite, and sulfur. The name “gypsum” is derived from the Greek word “gypsos,” which means “plaster” or “chalk.” Gypsum’s chemical composition is relatively simple, consisting primarily of calcium, sulfur, oxygen, and hydrogen atoms. In view of the geological characteristics of high pressure in salt-gypsum formation of deep wells in Tarim Piedmont structure, high-density oil-based drilling fluids are widely used, which makes it difficult for subsequent cementing work. In order to solve the technical difficulties of cementing high-density oil-based drilling fluid and salt-gypsum formation in KS well, which is a key ...The formation of gypsum in commercial quantities can generally be ascribed to one of three causes: Transformation of deposits, generally limestone, by chemical reactions involving weak solutions of sulfuric acid; precipitation from sea water, due primarily to concentration by evaporation; or reactions between the salts in solution.The effect of the formation of gypsum on the degradation of concrete is not as obvious as the effect of ettringite, and stable gypsum might only form at high sulphate concentrations [7,8].

Gypsum occurs in nature as flattened and often twinned crystals, and transparent, cleavable masses called selenite. Selenite contains no significant selenium; rather, both substances were named for the ancient Greek word for the Moon. Selenite may also occur in a silky, fibrous form, in which case it is commonly … See moreIn addition, the diameter reduction rate of salt-gypsum formation at different temperatures and drilling fluid densities are calculated. The wellbore diameter reduction rates of salt-gypsum formation are described in Fig. 5. The reduction rate of wellbore diameter becomes smaller as the drilling fluid density increases, which only takes the ...…

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs. Feb 20, 2018 · The gypsum originally taken into solution . Possible cause: Apr 27, 2022 · While the mechanism for gypsum formation during falling water .