Rock core samples

Samples of rocks, core samples, stream sediments, panned semi-concentrate and... 

Fig. 13. Rock core samples cut by a diamond-faced core bit reveal underlying structure and the possible presence of hydrocarbons, (Exxon Corp)...

Although there has been considerable effort to calculate the mobility of foam in porous media from first principles, utilizing usually measured rock properties ( 6), a different approach is used here. In this research, major emphasis has been on measurement of the mobility of C02 foam in rock core samples. The... 

One reason for the broadening is that there are differences in magnetic susceptibility between the solid phase and the fluid within it. This means that different parts of a pore space will be feeling different apparent magnetic fields, and so spectral linewidths will be broad. This is particularly the case when the sample contains trace amounts of paramagnetic ions. For instance, the linewidths of H spectra from rock core samples saturated with water may be 5 ppm for carbonates, but can exceed 50 ppm for sandstones. Magnetic... 

Rock core permeability (darcies) Rock core porosity (decimal nbr) Viscosity of invading fluid (op) Viscosity, displaced fluid (op) Pressure at left boundary (psi) Pressure at right boundary (psi) Length of rock core sample (ft) Initial "xfront" position (feet) Integration space step size (ft) Integration time step size (sec) Maximum allowed number of steps... 

Many groundwaters were sampled from deep (up to c. 2 km) boreholes. However, the sampling zones were relatively far apart (typically several tens of metres) owing to the relatively low frequency of fractures or sufficiently permeable matrices from which groundwater could be induced to flow into the boreholes. To supplement the data from sampled groundwaters and provide continuous geochemical profiles down the boreholes, rock core samples were collected to enable characterization of the pore-water composition (Cave et al. 1994). 

To gain an understanding of the composition of the reservoir rock, inter-reservoir seals and the reservoir pore system it is desirable to obtain an undisturbed and continuous reservoir core sample. Cores are also used to establish physical rock properties by direct measurements in a laboratory. They allow description of the depositional environment, sedimentary features and the diagenetic history of the sequence. 

Kem-obst, n. stone fruit, pip fruit. -31, n. kernel oil, specif, palm kernel oil Founding) core oil. -physik, /. nuclear physics, -polymeric, /. nuclear polymerism. -probe, /. core sample, -pulver, n. progressive burning powder, -pimkt, m. nucleus essential point, -riicldeinen, n. Metal.) core refining, -saft, m. Biol.) nuclear fluid, -salz, n. rock salt. 

The area between the Siquieros and Clipperton Transforms on the East Pacific Rise at 8-10°N (often referred to as 9°N ) has been a focus of intense study over the past 10 years. The first U-series work in this area involved combined °Th and Pa analyses of samples collected by submersible, rock coring and dredging along the southern portion of 9°N (Goldstein et al. 1993) (Fig. 3). Volpe and Goldstein (1993) analyzed three of these... 

High pressure equipment has been designed to measure foam mobilities in porous rocks. Simultaneous flow of dense C02 and surfactant solution was established in core samples. The experimental condition of dense CO2 was above critical pressure but below critical temperature. Steady-state CC -foam mobility measurements were carried out with three core samples. Rock Creek sandstone was initially used to measure CO2-foam mobility. Thereafter, extensive further studies have been made with Baker dolomite and Berea sandstone to study the effect of rock permeability. 

The slopes of the peaks in the dynamic adsorption experiment is influenced by dispersion. The 1% acidified brine and the surfactant (dissolved in that brine) are miscible. Use of a core sample that is much longer than its diameter is intended to minimize the relative length of the transition zone produced by dispersion because excessive dispersion would make it more difficult to measure peak parameters accurately. Also, the underlying assumption of a simple theory is that adsorption occurs instantly on contact with the rock. The fraction that is classified as "permanent" in the above calculation depends on the flow rate of the experiment. It is the fraction that is not desorbed in the time available. The rest of the adsorption occurs reversibly and equilibrium is effectively maintained with the surfactant in the solution which is in contact with the pore walls. The inlet flow rate is the same as the outlet rate, since the brine and the surfactant are incompressible. Therefore, it can be clearly seen that the dynamic adsorption depends on the concentration, the flow rate, and the rock. The two parameters... 

Core sampling Core samples from the well bore are taken to determine the rock formation and soil conditions. Samples can also be used to determine the flow potential of the receptor zone, concentrate compatibility, and the best drilling practices for the well... 

By far the most widespread use of NMR in an on-line production environment is the utilization of downhole exploration tools by petroleum service companies such as Schlumberger, Halliburton, and Baker Hughes. Articles on these unilateral NMR systems are found in the patent databases, " academic literature, and on-line resources provided by the exploration companies. The references provided here are just a few examples in a very prolific field. The technique is applied in high-temperature and pressure situations and currently is used down to a depth of about 10 km (6 miles) to produce a picture of water/oil content in the adjacent rock formations as well as to derive permeability, diffusivity, and hydrocarbon chemistry information. Mobile unilateral NMR systems such as the NMR-MOUSE are also being developed in order to take benchtop NMR systems into the field to perform analysis of geological core samples at the drill site. NMR analyzers are also being developed to determine the bitumen content and properties in tar sand production and processing. " " ... 

The primary dispersion halo and wallrock alteration around the Elura deposit was established from integrated petrographic, mineralogical and geochemical (major-, minor- and trace-element) analysis of diamond drill core samples. Seventy eight samples of variably altered and unaltered host rocks, as well as 67 near-surface weathered equivalents, were analysed for major elements using fusion disc. X-ray fluorescence analysis (XRF). Trace elements were determined by pressed powder XRF analysis. Carbonate carbon... 

Samples from individual cores were hand separated at NTS from drilling mud and rock chunks. Samples were selected for the experiment if their size exceeded 1 cm diameter and if they were hard, vitreous, and radioactive. Each core yielded from one to eight pieces of material that met these criteria. Samples were obtained from four cores from Test 1, ten cores from Test 2, and five cores from Test 3. 

Two general areao in Colorado exhibit extensive alteration of coalo by igneouo intrusives. The first locality it near Somerset in the west central part of the state, and the second area is the Spanish Peaks region near Trinidad and Walsenburg. Drill core samples, outcrop samples, materials from active mines, and thin sections of the intrusive rocks were studied. The results show that mean maximum reflectance of the altered coal or natural coke increases as the distance from an intrusive body decreases. Carbon and ash values increase as the distance from intrusive decreases whereas volatile matter values decrease. Sulfur data are variable. Hydrogen values increase as the distance from an intrusive increases. Hydrogen and reflectance are considered the most sensitive and reliable indicators of degree of alteration. 

Harlan County Lake (Reservoir), Nebraska, USA 15 sediment core samples Weathered shales and other rocks agricultural irrigation drainage 5.7-9.0 Christensen and Juracek (2001)... 

The first identification of cosmogenic noble gas in crustal rocks was reported by Kurz (1986). Kurz measured a series of basaltic-drilled core samples from Mauna Loa volcanoes in the Hawaiian Islands. The lava flow (14C age 20,000 a) has retained its surface flow structure and, therefore, was concluded to have experienced little surface erosion. Because the 3He concentration in the surface of the lava flow (10 I2-I0 cm3STPg ) gave reasonable agreement with a theoretical production... 

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