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effect of minerals on resistivity logs

  • Water Saturation from Electric Logs

    Resistivity Logs • Measures electrical conductivity due to:- • Brine in the pore space • Capillary bound water • Water in shales • Hydrocarbons and Matrix are mostly non-conducting, but there are some conductive minerals • Resistivity is the inverse of Conductivity • Laterolog • Lower frequency (35Hz)

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  • An Experimental Study of the Effect of Rock/Fluid .

    An Experimental Study of the Effect of Rock/Fluid Interaction on Resistivity Logs during CO 2 Sequestration in Carbonate Rocks. Journal of Geoscience and Environment Protection 1, 2,-7. . ducing precipitates of carbonate minerals, and ) .

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  • THE ROLE OF CLAYS AND SHALES IN LOW RESISTIVITY LOG .

    The clay component does, however, affect log response. Any thorough log evaluation must account for the effects of shale and clay minerals. These effects reach beyond a simple reduction in resistivity response. Other petrophysical properties of shales and clays must be considered, such as density, amount of hydrogen, radioactivity, permeability .

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  • Electrical resistivity of minerals and rocks at high .

    Data are given on (1) the effect of porosity, pore configuration, mineral composition, concentration of electrolyte, content of clay, type of cement, and type of cementation on the relationship between resistivity and pressure, ρ = f(P) and (2) the resistivity of water‐saturated magmatic rocks at high temperatures (up to 260°C) and .

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  • Advances in resistivity processing improve well .

    Home; Advances in resistivity processing improve well interpretation. A new method for processing propagation resistivity log data allows for the simultaneous correction of anisotropy and .

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  • Resistivity Quiz Flashcards | Quizlet

    using SP logs, using fluid samples, using deep electrical resistivity is a water-saturated sand and applying Archie's equation For Picket Plot in a water-saturated sand, choose the depth interval in a way that temperature variation in the selected zone is

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  • Well logging - Wikipedia

    Well logging, also known as borehole logging is the practice of making a detailed record (a well log) of the geologic formations penetrated by a borehole.The log may be based either on visual inspection of samples brought to the surface (geological logs) or on physical measurements made by instruments lowered into the hole (geophysical logs).Some types of geophysical well logs can be done .

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  • Log analysis: lithology - AAPG Wiki

    Some log measurements do not provide any relevant information in a given section. If the K, Th, and U values are uniformly low in the evaporite minerals, these logs have no resolving ability and are of little help in determining the rock constituents. If dolomite contains uranium, the uranium log is diagnostic.

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  • Effect of Conductive Solids on Formation Resistivity .

    Fundamentals of Fluid Flow in Porous Media . Chapter 2 Formation Resistivity Factor: Effect of Conductive Solids. The clay minerals present in natural rock act as a conductor and are sometimes referred to as "conductive solids", but it is actually the water in the clay and the ions in the water that are the conducting materials.

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  • Borehole Geophysics

    The electromagnetic-induction probe is designed to maximize vertical resolution and depth of investigation and to minimize the effects of the borehole fluid. Fluid-resistivity logs record the electric resistivity of water in the borehole. Changes in fluid resistivity reflect differences in dissolved-solids concentration of water.

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  • Resistivity logging - Wikipedia

    Resistivity logging is a method of well logging that works by characterizing the rock or sediment in a borehole by measuring its electrical resistivity.Resistivity is a fundamental material property which represents how strongly a material opposes the flow of electric current.In these logs, resistivity is measured using 4 electrical probes to eliminate the resistance of the contact leads.

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  • Electrical Properties of Rocks and Minerals

    286 Electrical properties of rocks and minerals where + is the fractional pore volume (porosity), S is the fraction of the pores containing water, pw is the resistivity of water, n = 2, and a, rn are con- stants, 0.5 I a I 2.5, 1.3 I rn I 2.5.For example,

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  • Crain's Petrophysical Handbook | Visual Analysis Of Lithology

    Young shales have low resistivity (1 to 4 ohm-m), older shales have medium resistivity (5 to 25 ohm-m). Shale source rocks have higher resistivity (25 to 250 ohm-m) and usually have extra high GR (150 to 300 API units). Annotated logs showing layers picked on the basis of shale volume.

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  • Dakota--Petrophysics 6--Resistivity Logs

    The method is widely used by log analysts in the oil industry and generally gives good estimates of water resistivity in deeper (more saline) formation waters. Results are less reliable in aquifers because of clay mineral effects as well as surface conduction on quartz grain surfaces.

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  • Petrophysical evaluation of well log data and rock physics .

    Jul 28, 2017 · A detailed petrophysical analysis blended with rock physics modeling have been carried out for reservoir characterization of Chandmari oilfield in Upper Assam-Arakan basin, India, using a suite of well log data from six wells in the field. Lithological interpretation and effects of rock minerals and fluids have been assessed.

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  • 4.4 Electrical conductivity of minerals and rocks

    4.4 Electrical conductivity of minerals and rocks . Resistivity of molten minerals can be less than one Ohm-m.) The current . particular metallic mineral has a big effect on the resistivity. For example, pure pyrite, FeS 2, has a resistivity of about 3x10-5 Ohm-m but with minor amounts of

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  • Formation Resistivity Factor - an overview | ScienceDirect .

    The effect on resistivity logs of the presence of clays in a formation is one of the greatest technical problems encountered in down-hole log analysis. This problem has been studied for many years and is still receiving much attention [17, 18, 19]; perhaps the most definitive work is that of Waxman and Smits [18] and Waxman and Thomas [19]. The .

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  • Electrical resistivity of minerals and rocks at high .

    Data are given on (1) the effect of porosity, pore configuration, mineral composition, concentration of electrolyte, content of clay, type of cement, and type of cementation on the relationship between resistivity and pressure, ρ = f(P) and (2) the resistivity of water‐saturated magmatic rocks at high temperatures (up to 260°C) and .

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  • Effect Of Pyrite On Resistivity And Other Logging Measurements

    It includes laboratory measurements on field cores (provided by BP-Alaska), artificial sand packs, and large chunks of pyrite. The effect of pyrite on the porosity logs appears to be small for Sonic and Neutron logs, but large for the Density log. The Density log may be more useful in some cases for determining pyrite content than porosity.

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  • The effect of Clay on Porosity and Resistivity - Mechanics .

    20. THE EFFECT OF CLAY ON POROSITY AND RESISTIVITY LOGS 20.1 Introduction. The presence of clay minerals or shale in porous formations presents problems from the interpretation of wireline logs. For most logs these problems have been discussed in the relevant chapter.

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  • ARE PORE LINING CHLORITES A CAUSE OF LOW RESISTIVITY .

    surface area (SSA) effects were subordinated, due to the low values of these parameters. However, the question of the specific contribution of chlorite to low resistivity in sandstones was still open, due to poor documentation in literature. Moreover, the possible effect .

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  • ARE PORE LINING CHLORITES A CAUSE OF LOW RESISTIVITY .

    surface area (SSA) effects were subordinated, due to the low values of these parameters. However, the question of the specific contribution of chlorite to low resistivity in sandstones was still open, due to poor documentation in literature. Moreover, the possible effect .

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  • Mining Thickener for Mineral Processing, Low Cost .

    Dakota Petrophysics 6 Resistivity Logs. The method is widely used by log analysts in the oil industry and generally gives good estimates of water resistivity in deeper (more saline) formation waters. Results are less reliable in aquifers because of clay mineral effects as well as surface conduction on quartz grain surfaces. Get Price

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  • The Lowdown on Low-Resistivity Pay - Schlumberger

    resistivity pay in sands, then explores the tools and techniques that have been devel-oped to evaluate such zones. A case study shows how log/core integration helps pin-point the causes of low-resistivity pay in the Gandhar field in India. Generally, deep-resistivity logs in low-resistivity .

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  • Modeling The Effects Of Glauconite On Some Openhole Logs .

    Modeling the effects of glauconite on the responses of density, Pe and neutron porosity logs has been used to improve the determination of porosity and lithology from well log data. Glauconites are iron-rich minerals often found in sandstones, limestones, and siltstones. Sandstones rich in glauconite are commonly known as "greensands.

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  • Effect of Mineralogy on NMR, Sonic, and Resistivity: A .

    the differences between biogenic and detrital silica as well as effects of additional influx of clay and carbonate material in the biogenic lithology. Recognizing such differences can help better analyze and interpret NMR, sonic, porosity, and resistivity logs. Our combined laboratory and well log data analysis shows how mineralogy and clay

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  • Electrode resistivity devices - PetroWiki

    The Groningen effect was named after the large Dutch gas field where the anomaly was first identified. The effect is an anomalously high resistivity reading that occurs for approximately 100 ft [30 m] below a thick, highly resistive bed such as the thick evaporitic Zechstein caprock at the Groningen field. The effect is maximum around 1 ohm•m.

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  • Resistivity log - SlideShare

    Feb 17, 2016 · Resistivity log 1. Resistivity LogResistivity Log • Basics about the Resistivity: • Resistivity measures the electric properties of the formation, • Resistivity is measured as, R in Ohm-meter, • Resistivity is the inverse of conductivity, • The ability to conduct electric current depends upon: • The Volume of water, • The Temperature of the formation, • The Salinity of the .

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  • Further studies of the effects of pressure on electrical .

    With the first relation, resistivity of a rock of known porosity can be calculated relative to fluid resistivity, and with the second, the effect of pressure of up to 10 kb. For a rock composed of conductive minerals, pressure at first decreases resistivity sharply and, then, has almost no effect.

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  • 19. ELECTRICAL LOGGING 19.1 Introduction

    resistivity in the conventional sense, and are usually referred to as resistivity tools. Both the induction logs and the laterologs come in different types, which are sensitive to different depths of penetration into the borehole. Hence resistivity determinations for the invaded, partly invaded and undisturbed rock zones can be measured.

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