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effect of minerals on resistivity logs

HOW COMMON MINERALS CAN MISLEADINGLY

2011-5-4  MINERAL EFFECT ON LOG RESPONSES GR Res. Other Effects REASON Heavy mineral Siderite Can suppress resistivity if distributed in laminated beds; causes under estimation of density porosity. Heavy mineral; conductive if distributed in laminated beds Shale Micro-laminae

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20. THE EFFECT OF CLAY ON POROSITY AND

2014-5-21  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. The

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Effect Of Pyrite On Resistivity And Other Logging

In this investigation, the approach has been essentially experimental. 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

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Resistivity Log an overview ScienceDirect Topics

Romeo M. Flores, in Coal and Coalbed Gas, 2014 Resistivity Log. The resistivity log is acquired by measurements of the resistance of the coal and associated rocks to flow of electrical currents and by inducing currents into the reservoir rock (Figure 7.29) (Scholes & Johnston, 1993).Consequently, various combinations of electric and induction resistivity logs are deployed depending on the

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4.4 Electrical conductivity of minerals and rocks

2012-1-31  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 copper mixed in this can increase to 10 Ohm-m. 3 The range of resistivity for some typical ore minerals is as follows:

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IMPACT OF CONDUCTIVE MINERALS ON

2015-3-31  minerals can have a dramatic effect on the DC resistivity. Chapter 5 includes a discussion of ways to predict resistivity in rocks which contain conductive minerals both above and below the dry conduction threshold. Determining whether or not the rock

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Effects of Bentonite Content on Electrical Resistivity of

Clay minerals were artificially mixed with fine sands at an increment of 20% to determine the effect of mineral contents on resistivity. A total of 10 artificial soils with different

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Characteristics of gas hydrate reservoirs and their effect

2018-9-1  The resistivity logs are recommended to identify and evaluate gas hydrates. This may reflect the effect of the clay minerals. With an increase in clay minerals, the percentage of large pores decreases and their contribution to the conductivity of the rock also decreases. Generally, a high clay mineral content results in a high clay-bound

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19. ELECTRICAL LOGGING 19.1 Introduction

2014-5-21  Resistivity Logs Deep 0.1 Shallow 105. The dual laterolog is equipped with centralizes to reduce the borehole effect on the LLs. A micro-resistivity device, usually the MSFL, is mounted on one of the four pads of the lower of the two centralists. Hence, this tool combination examines the resistivity of the formation at three depths of

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Atlas of Log Responses spec2000.net

2018-11-12  Resistivity Water Based Mud Bulk Density & Neutron Porosity Acoustic Magnetic Resonance T2 Distribution General Log Matrix Responses Clay Bound Capillary Bound Shale Sandstone RA Mineral Fractures Conductive Loss of Secondary Porosity Shaly Sand Laminated Pay Oil Salt Water Tuff Marine Shale Limestone Marl Dolomite Fractured Anhydrite NaCI Salt

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Dakota--Petrophysics 6--Resistivity Logs

The sensitivity of resistivity logs to water salinity can be used in an alternative method to SP log estimates of water quality. In a sandstone-shale sequence, resistivity variation is controlled by a variety of phenomena, including cation-exchange mechanisms by clay minerals within the shalier zones, conduction by metallic minerals, and the

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Resistivity Log an overview ScienceDirect Topics

Romeo M. Flores, in Coal and Coalbed Gas, 2014 Resistivity Log. The resistivity log is acquired by measurements of the resistance of the coal and associated rocks to flow of electrical currents and by inducing currents into the reservoir rock (Figure 7.29) (Scholes & Johnston, 1993).Consequently, various combinations of electric and induction resistivity logs are deployed depending on the

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An Experimental Study of the Effect of Rock/Fluid

2014-7-3  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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IMPACT OF CONDUCTIVE MINERALS ON

2015-3-31  minerals can have a dramatic effect on the DC resistivity. Chapter 5 includes a discussion of ways to predict resistivity in rocks which contain conductive minerals both above and below the dry conduction threshold. Determining whether or not the rock

get price

4.4 Electrical conductivity of minerals and rocks

2012-1-31  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 copper mixed in this can increase to 10 Ohm-m. 3 The range of resistivity for some typical ore minerals is as follows:

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Gamma and resistivity logs for characterization of

2014-11-12  Different parameters obtained through geophysical borehole logging using self potential, resistivity, gamma–gamma, neutron, natural gamma, and acoustic tools, help in the identification of strata and estimation of the physical, electrical, and acoustical properties of the subsurface lithology. In the coal mining industry, currently, the main application for the logs is to determine coal seam

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KGS--Geological Log Analysis--Nuclear Porosity Logs

water of crystallization--some evaporitic minerals, such as gypsum have water of crystallization. Gypsum is a hydrated form of calcium sulfate with a formula of CaSO 4 · 2H 2 O. The gypsum response exceeds 60% equivalent limestone porosity on a neutron log. hydroxyls--minerals that have a hydroxyl component (OH). Goethite is an example, with

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Atlas of Log Responses spec2000.net

2018-11-12  Resistivity Water Based Mud Bulk Density & Neutron Porosity Acoustic Magnetic Resonance T2 Distribution General Log Matrix Responses Clay Bound Capillary Bound Shale Sandstone RA Mineral Fractures Conductive Loss of Secondary Porosity Shaly Sand Laminated Pay Oil Salt Water Tuff Marine Shale Limestone Marl Dolomite Fractured Anhydrite NaCI Salt

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Quick-look lithology from logs AAPG Wiki

2019-3-12  Radioactive minerals in sands, especially K-feldspar, zircon, and mica, can raise sand readings as high as adjacent shales. Gamma ray logs may be useless in immature sands derived from basement terranes. However, beach placers rich in zircon may be valuable correlative markers if not mistaken for shale.

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Basic Well Log Interpretation Schlumberger

2021-7-26  resistivity, porosity and water satu-ration (and thus its inverse: hydro-carbon saturation) was established by G.E. Archie, paving the way for a quantitative evaluation of formation properties using well logs. Early electric logs, or e-logs, plotted only formation resistivity measure-ments.

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Dakota--Petrophysics 6--Resistivity Logs

The sensitivity of resistivity logs to water salinity can be used in an alternative method to SP log estimates of water quality. In a sandstone-shale sequence, resistivity variation is controlled by a variety of phenomena, including cation-exchange mechanisms by clay minerals within the shalier zones, conduction by metallic minerals, and the

get price

An Experimental Study of the Effect of Rock/Fluid

2014-7-3  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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Effect of pyrite on resistivity and other logging

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. The electrical properties of pyritic rocks, for the range of frequencies used in resistivity logging, were found to be strongly

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4.4 Electrical conductivity of minerals and rocks

2012-1-31  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 copper mixed in this can increase to 10 Ohm-m. 3 The range of resistivity for some typical ore minerals is as follows:

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Effects of Mineral Admixture on Electrical Resistivity and

The corrosion of reinforced concrete mainly was caused by chloride contaminated. Kinds of mineral admixtures such as Fly Ash Type B (FA), Silica Fume Type A (SF), Metakaolin (MKP) and Blast Furnace Slag Type B (BB) are necessary to increase the corrosion resistance. The electrical resistivity and permeability were used on evaluating the effects of mineral...

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INTRODUCTION TO GEOPHYSICAL WELL LOGGING AND

2018-12-18  2.3.3 Resistivity logs Resistance is impedance to flow of current and is a function of geometry and intrinsic resistivity of the material. Resistivity is the inverse of conductivity. Current flow in porous rock is mainly through the fluid filling the pore space and is affected by pore volume, pore connectivity and pore fluid

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Atlas of Log Responses spec2000.net

2018-11-12  Resistivity Water Based Mud Bulk Density & Neutron Porosity Acoustic Magnetic Resonance T2 Distribution General Log Matrix Responses Clay Bound Capillary Bound Shale Sandstone RA Mineral Fractures Conductive Loss of Secondary Porosity Shaly Sand Laminated Pay Oil Salt Water Tuff Marine Shale Limestone Marl Dolomite Fractured Anhydrite NaCI Salt

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19. ELECTRICAL LOGGING 19.1 Introduction

2014-5-21  Resistivity Logs Deep 0.1 Shallow 105. The dual laterolog is equipped with centralizes to reduce the borehole effect on the LLs. A micro-resistivity device, usually the MSFL, is mounted on one of the four pads of the lower of the two centralists. Hence, this tool combination examines the resistivity of the formation at three depths of

get price

Basic Well Log Interpretation Schlumberger

2021-7-26  resistivity, porosity and water satu-ration (and thus its inverse: hydro-carbon saturation) was established by G.E. Archie, paving the way for a quantitative evaluation of formation properties using well logs. Early electric logs, or e-logs, plotted only formation resistivity measure-ments.

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THERMAL PROPERTIES OF ROCKS USGS

2010-11-6  23. Temperature effect on thermal conductivity of albite-anorthite solid solutions 43 24. Temperature effect on thermal conductivity of mafic silicate minerals 45 25. Temperature effect on thermal conductivity of forsterite-fayalite solid solutions 46 26. Temperature effects on thermal conductivity of calcite and aragonite 47 27.

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