Resistivity logging is sometimes used in mineral exploration (especially exploration for iron and potassium) and waterwell drilling, but most commonly for formation evaluation in oil and gaswell drilling. Most rock materials are essentially insulators, while their enclosed fluids are conductors. Hydrocarbon fluids are an exception, because they are almost infinitely resistive.
For most rocks (except for conductive minerals such as pyrite, which cannot be treated in this way) only the porous part needs to be considered when discussing electrical properties, and it is treated according to the Archie watersaturation equation.
The main goal of this paper is an application of the generalized effectivemedium theory of induced polarization (GEMTIP) to studying the complex resistivity of typical mineral rocks. We collected representative rock samples from the CuAu deposit in Mongolia, and subjected them to the mineralogical analysis using Quantitative Evaluation of Minerals by Scanning Electron Microscopy .
Submarine hydrothermal deposits are one of the promising seafloor mineral resources, because they can store a large amount of metallic minerals as sulfides. The present study focuses on the electrical properties of active modern submarine hydrothermal deposits, in order to provide constraints on the interpretation of electrical structures obtained from marine electromagnetic surveys.
Complex resistivity of mineral rocks in the context of the generalized effectivemedium theory of the IP effect . Vladimir Burtman*, University of Utah and TechnoImaging, Masashi Endo, TechnoImaging, Wei Lin, University of Utah, and Michael S. Zhdanov, University of Utah and TechnoImaging .
laboratory resistivity of granite rock, indicates, field measurements with lower resistivity than laboratory analysis indicating presences of water in the pores and cracks of subsurface rocks. Thus the true resistivity of rocks is higher than the apparent resistivity attributed to the moisture content from water and minerals in the subsurface rock.
Abstract An overview of electrical resistivity in the crust and upper mantle: principle of magnetotelluric method, accuracy and resolution of resistivity modeling, and electrical resistivity feature of crustal and mantle rocks and minerals
rock surface is exposed to the lower pressure so that more pores can easily lose water to the fracture. This creates a higher resistivity region adjacent to the fracture. Mineral coatings on fracture surfaces will likely have an effect on the changing electrical properties of similar systems. Future work will .
Resistivity of rocks and minerals Air, gas or oil: infinite or very high resistivity. Liquid materials from landfills are generally conductive (<10 )
If the resistivity of the rocks is everywhere uniform, then the current sheet is uniform as well. However, if, for example, an appropriatelyoriented long shear zone of 1 000 ohmmetres (Sm) lies in a host of 10 000 Sm, then the current sheet will be deformed and ten times as much current will flow in the shear zone as in the host rocks.
RESISTIVITY OF ROCKS AND MINERALS Purpose To discover which rocks, minerals and fluids conduct electricity and which do not. This information is important when using resistivity for prospecting, either on the surface or down the hole.
The resistivity of most rocks varies with porosity, the salinity of the interstitial fluid, and certain other factors. Rocks containing appreciable clay usually have low resistivity. The resistivity of rocks containing conducting minerals such as sulfide ores and graphitized or pyritized rocks depends on the connectivity of the minerals present.
The resistivity log Resistivity logs measure the ability of rocks to conduct electrical current and are scaled in units of ohmmeters. There is a wide variety of resistivity tool designs, but a major difference between them lies in their "depth of investigation" (how far does the measurement extend beyond the borehole wall?) and their "vertical resolution" (what is the thinnest bed that can be ...
RESISTIVITY OF ROCKS and ARCHIE'S LAW. Graphite, native metals, and minerals with metallic lusters are also electrical conductors, but these are far scarcer than clays. The electrical resistivity of a fluid depends on the amount of ionic material in solution and on the temperature of the liquid.
results and provided an equation to relate the resistivity and saturation of rocks. Thereafter, one can not only qualitatively evaluate the fluids in rocks but also quantitatively calculate the amount of water and hydrocarbons. Generally, the resistivity and permittivity of the rock are functions of the chemical composition, density, porosity,
The resistivity of rocks and soils depends on several parameters, such as porosity, saturation, pore water conductivity, temperature, and clay content [29,30]. In clayfree rocks, electrical current flows through electrolytic pathways in the pore fluid, as the rock matrix is usually assumed to be electrically insulating.
Electrical Methods. Since the conduction of current in soil and rock is through the electrolyte contained in the pores, resistivity is governed largely by the porosity, or void ratio, of the material and the geometry of the pores. Pore space may be in the form of intergranular voids, joint or fracture openings,...
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