References in periodicals archive ?
oxalic, citric, acetic and malic) and sodium tetraphenyl boron may vary widely and depends on different factors such as content and type of clay minerals, mineral size, calcium carbonate (CaC[O.sub.3]) and quartz contents, soil development and weathering status (Gil-Sotres and Rubio 1992; Cox and Joern 1997; Rao et al.
These changes in microstructure clearly indicate the effect of acid contamination and phosphogypsum treatment on clay mineral behavior.
The typical tests for analyzing the microphysical property of red-layers are SEM analysis which include micromorphology scanning, energy spectrum analysis, and XRD which include clay mineral and total mineral analysis.
The potential impact factors considered in this work include (i) water content, [omega], (ii) clay mineral composition, M, (iii) clay content, C, (iv) confining pressure, [[sigma].sub.3], and (v) cyclic failure time, [N.sub.f].
The semiquantitative mineralogical analysis was based on the signal area ratio and the intensity of clay mineral (intensity factors) [38-40].
The CR-based model is good at predicting clay mineral concentration (e.g., 20, 47, and 88; [R.sup.2] > 0.79).
Vermiculite (Ver) is also a layered clay mineral composed of two sheets of Si[O.sub.4] [9]; tetrahedra coupled symmetrically to another sheet of Mg[O.sub.6.sup.4-] octahedral in a tetrahedral-octahedral-tetrahedral layer lattice (Figure 2(b), [7]).
Bjorlykke, "Clay mineral diagenesis in sedimentary basins-a key to the prediction of rock properties, examples from the North Sea Basin," Clay Minerals, vol.
and Bradley, W.F.: 1959, A mixed-layer clay mineral associated with an evaporite.
In these rocks quartz (30-60%) significantly (1.5 to 2 times) prevails over the clay minerals. They contain a large amount of carbonates (calcite, dolomite): from 5-15% in mudstones and limy mudstones to 51% in marlstones.
Clay mineral type and content were tested by X-ray diffraction (XRD) using an Empyrean diffractometer provided by a third test company.
In this paper, four independent parameters, namely, clay mineral content, volume percentage of mobile fluid, throat radius, and start-up pressure gradient, are used to determine the locations of advantageous reservoirs.