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20. THE EFFECT OF CLAY ON POROSITY AND RESISTIVITY LOGS 20

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 problem is, however, especially bad in the interpretation of resistivity data, and also affects the porosity logs. This is not only because the presence of clays and shale have a gross effect upon

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HOW COMMON MINERALS CAN MISLEADINGLY INFLUENCE LOG

MINERAL EFFECT ON LOG RESPONSES GR Res. Other Effects REASON Mica © Causes under estimation of density porosity. Radioactive; micro-porous; heavy mineral

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Resistivity Log an overview ScienceDirect Topics

Resistivity of rocks is measured by M-logs (combination of the normal and lateral resistivity logs and the spontaneous potential, SP, curve). The method of the multi-lateral electric sonding, using several sonds of different size, was used to obtain the true resistivity. The induction log and laterolog were used also. The electric resistivity can be used to estimate porosity, water saturation

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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 dependent on the distribution of pyrite and the

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THE ROLE OF CLAYS AND SHALES IN LOW RESISTIVITY

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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Dakota--Petrophysics 6--Resistivity Logs

The shallowest reading resistivity device (in this case, the spherically focused log) therefore records the highest resistivity because it responds mostly to formation invaded by the higher resistivity mud filtrate. The two induction logs draw their responses from deeper in the formation, so that the deep induction log (ILD) probably records a reading close to the true resistivity of the

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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 bentonite

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SCA2003-32: EFFECT OF GLAUCONITE ON PETROPHYSICAL

resistivity data from the discovery well which addressed the differences between log and core S w estimates and are discussed in the following sections. A third well was drilled, including a sidetrack, indicating even more extreme S w values from DS of between 55

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Log analysis for unconventionals SEG Wiki

Assuming that resistivity logs respond to fluids, while porosity logs (sonic, density, or neutron) respond to kerogen/matrix and fluids, the Passey (1990) method combines these two type of logs to estimate TOC in organic-rich rocks. Using either porosity curve, the method relies on porosity and deep resistivity readings separating from each other in organic-rich rocks, whereas in organic-lean

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Log analysis for unconventionals SEG Wiki

Assuming that resistivity logs respond to fluids, while porosity logs (sonic, density, or neutron) respond to kerogen/matrix and fluids, the Passey (1990) method combines these two type of logs to estimate TOC in organic-rich rocks. Using either porosity curve, the method relies on porosity and deep resistivity readings separating from each other in organic-rich rocks, whereas in organic-lean

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Crain's Petrophysical Handbook Induction Logs

Induction log showing logarithmic scale (left) and linear scale (upper left) with conductivity curve as well as resistivity curves. Many varieties of Induction logs are run today, some with interpretive images of resistivity profiles or saturation. Combination log presentations with porosity curves, such as sonic (right) or density are found in some locations. The SP and/or gamma ray curve is

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Petrography and petrophysical well log interpretation for

Department of Geology and Mineral Resources Engineering. Submission date: June 2013. Norwegian University of Science and Technology . 1 Abstract 39 thin sections and petrophysical log data from the Skalle well in the Hammerfest Basin, in the southwestern part of the Barents Sea, have been studied to interpret lithology, and diagenesis and their effect on the reservoir quality, and to compare

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Resistivity log SEG Wiki

Resistivity logs are electrical well logs that record the resistivity of a formation. Resistivity is usually recorded in ohm meters (Ωm) and is displayed on track 4 of a well log. Three depths of resistivity can be logged (shallow, medium, and deep) that record the resistivity of the formation with increasing distance away from the borehole.

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Formation Resistivity Factor an overview ScienceDirect

The formation resistivity factor, F 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 clay

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ARE PORE LINING CHLORITES A CAUSE OF LOW RESISTIVITY IN

ARE PORE LINING CHLORITES A CAUSE OF LOW RESISTIVITY IN SANDSTONES? François Henn*, Claudine Durand1**, Adrian Cerepi2**,Etienne Brosse** and J.C. Giuntini* * Laboratoire de Physicochimie de la Matière Condensée, Université Montpellier II, France, **IFP, Rueil-Malmaison- France ABSTRACT Low resistivity in argillaceous sandstone reservoirs may be attributed either to the effect

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19. ELECTRICAL LOGGING 19.1 Introduction

Resistivity Logs Deep 0.1 Shallow 105. Petrophysics MSc Course Notes Electrical Logs Dr. Paul Glover Page 248 Take an homogeneous and isotropic medium that extends to infinity in all directions. Now pass a current from an electrode A in the medium to another B infinitely distant. We take the potential of electrode A to be some value V A = V, and that of electrode B to be zero, V B = 0. The

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Effect of Soil Mineralogy and Pore-Water Chemistry on the

This stone explores the pore-fluid effect on Archie’s law. Experimental tests were performed on sand and clay specimens to measure the variation in their electrical resistivity at different porosities and for different electrical resistivities of the pore fluid. The results demonstrate that the sand specimens (i.e., low specific surface soil

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Quantification of Clay Mineral and Log Response Towards

Quantification of Clay Mineral and Log Response Towards Reservoir Rock Properties 1Nur Asyraf Md Akhir, 2Gamal Ragab Gaafar, 1Ismail Mohd Saaid,

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An Experimental Study of the Effect of Rock/Fluid

2 sequestration and the effect on saturation estima-tion. This electrical behavior and its possible effect on CO 2 monitoring and estimation are dis-cussed. Keywords Carbon Dioxide Sequestration and Monitoring, Resistivity Log, Rock Fluid Interaction, Archie Equation 1. Introduction CO

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