... < 600 °C. When the temperature is around 400 °C, the negative Poisson's ratio effect is particularly significant. When the axial load is less than 37 MPa, the strain analysis shows that the quartz in granite shrinks radially, which means the negative Poisson's ratio effect. The change of quartz content...

... beyond which SCC may fail, we need to understand SCC's atomic mechanisms. In this study, stress corrosion cracking of the pre-cracked crystalline quartz is considered using a reactive molecular dynamics simulation. The results show that water has a strong influence on subcritical crack growth...

... to model shales under more realistic subsurface conditions. We considered three samples from the Haynesville-Bossier shale, USA: a clay-rich Bossier sample and two more quartz and carbonate-rich Haynesville samples to study the indentation modulus, M , hardness H and creep modulus C at the scale...

... formation damage complex reservoir oilfield chemistry structural geology reservoir characterization hydraulic fracturing precipitation quartz composition concentration experiment laboratory production chemistry upstream oil & gas mineral composition kcl solution clay mineral...

... Diffraction data and microstructure by optical microscopy. The analyzed samples identified three distinct microstructural zones: the carbonate matrix, the composite matrix of clay, and the embedded quartz grains and small mineral grains. Nanoindentation test was used to determine the elastic modulus...

... ABSTRACT: Using examples from Cretaceous Frontier Formation, we document quartz volumes deposited during and after opening in fractures formed at shallow (<2 km), intermediate (>4 km) and deep (>6 km) conditions. Inconspicuous rinds >0.02 mm thick predominate at shallow depths...

... interaction. The aim of this study is to characterize the microstructural evolution and chemo-mechanical interaction of shales with CO 2 rich brine. Shale assessment, in this case, is focused on the characterization of its constituent phases such as clay, quartz or calcite. Various types of Eagle Ford shales...

... government Reservoir Characterization carbonate reservoir florida carbonate-rock specific gravity fdot database Upstream Oil & Gas quartz porosity bulk porosity specimen complex reservoir strength carbonate content Overview x-ray diffraction aragonite mineral dolomite calcite dry unit...

... (after alteration) coated quartz gouge under recreated in situ conditions - and for control samples without grain coating. Slip stability parameters are captured by systematically varying shear velocity. Frictional healing and creep is captured by slide-hold-slide procedures with various hold durations...

... of saturated gouges in velocity stepping and slide-hold-slide tests. Gouge samples include ground Marcellus shale, quartz, and a 50:50 mixture of the two. Friction measurements indicate that Marcellus gouge is weak (µ<0.47) and quartz gouge is strong (0.56 <µ<0.61), with 50:50 mixtures anomalously...

... the lower bound reduces to the Reuss average. The bounds described above are very broad for mixtures with widely different properties such as quartz and brine. ARMA 18-1272 Calculating the Frame Modulus in Gassman s Equation Myers, M. T. University of Houston, Houston, Texas, USA Hathon, L.A. University...

... matter and other minerals (quartz, feldspar, and pyrite). The interplay of organic matter content, mineral contents and elastic properties remain limited studies. In this study, combined experimental methods including Rock-Eval pyrolysis, XRD and nanoindentation were conducted on six organic-rich shale...

... minerals (quartz, feldspar, calcite, dolomite and kaolinite) with different compositions. Reconstituted specimens were tested for unconfined compressive strength (UCS) and splitting tensile strength after curing for 14 days. 38mm diameter and 76mm length specimens were used for the UCS tests, and 19mm...

... interaction quartz fracture conductivity kaolinite reduction 1. INTRODUCTION Shale caprocks constitute the majority of effective seals for geologic hydrocarbon bearing formations and are therefore of considerable interest in underground CO2 storage into depleted oil and gas formations (Vialle et al...

... ABSTRACT: Shales are mainly composed of clay minerals and other secondary minerals (e.g., quartz and pyrite), as well as organic matter (e.g., gas and kerogen). Microscopic observations show that non-layered, relatively coarser and hard silicate minerals are embedded within a mixed clay...

... phase/ crack mapping, which we first applied to a layered sample from the ZRP-3a core. Comparison of phase/ crack maps of layered sandstone samples may provide the key to help identify the processes controlling pore pressure depletion-induced compaction. Reservoir Characterization quartz...

... impact on the Young’s modulus and brittleness index growth than quartz. These observations led us to modify the conventionally used mineralogical brittleness index by incorporation of TOC factor and determination of the calcite placement in the formula numerator. We also compare the intensity of vertical...

... Abstract: Introduction the relative amount of each component present; the elastic properties of each component; the geometrical distribution of each component. wellbore integrity quartz particle reservoir geomechanics Wellbore Design strength correlation mineral...

... the Young's Modulus and Hardness values of the rock, and compared the results. The results showed that the mineral composition varies with the samples through depth. Upper and Lower Bakken shows more content of clay minerals while Middle Bakken incorporates more quartz. From the SEM images, abundant natural...

...). These bands were associated with veins and veinlets of quartz-pyrite that were irregular and sub parallel, with regional schistosity containing up to 70% pyrite. Zone 2 included 5 subzones of mineralized veins and veinlets, with widths of millimetres to centimetres. These contained quartz- pyrite and quartz...