High Resolution From a New Laterolog With Azimuthal Imaging

Smits, J.W.; Benimeli, D.; Dubourg, I.; Faivre, O.; Hoyle, D.; Tourillon, V.; Trouiller, J-C.; Anderson, B.I.

doi:10.2523/30584-ms

Cited by 2 publications

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“…Azimuthal resistivity imager (ARI) and high-resolution azimuthal laterolog sonde (HALS) were earlier proposed to study three-dimensional distribution of resistivity surrounding the borehole. However, the logging response mechanism is not well understood and application examples about fractures are rare (Faivre 1993;Davies et al 1994;Smits et al 1995;Yang and Tao 1999;Karim et al 2013;Olsen et al 2014). This study aims to implement numerical simulation of the high-resolution azimuthal resistivity laterolog (HARL), in order to combine the radial detection of dual laterolog and azimuthal detection around the borehole, and then corresponding logging response characteristics and identification method of fractures are investigated to aid fractured reservoir evaluation.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of high-resolution azimuthal resistivity laterolog response in fractured reservoirs

Deng

Li³

et al. 2015

Pet. Sci.

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The high-resolution azimuthal resistivity laterolog response in a fractured formation was numerically simulated using a three-dimensional finite element method. Simulation results show that the azimuthal resistivity is determined by fracture dipping as well as dipping direction, while the amplitude differences between deep and shallow laterolog resistivities are mainly controlled by the former. A linear relationship exists between the corrected apparent conductivities and fracture aperture. With the same fracture aperture, the deep and shallow laterolog resistivities present small values with negative separations for low-angle fractures, while azimuthal resistivities have large variations with positive separations for high-angle fractures that intersect the borehole. For dipping fractures, the variation of the azimuthal resistivity becomes larger when the fracture aperture increases. In addition, for high-angle fractures far from the borehole, a negative separation between the deep and shallow resistivities exists when fracture aperture is large as well as high resistivity contrast exists between bedrock and fracture fluid. The decreasing amplitude of dual laterolog resistivity can indicate the aperture of low-angle fractures, and the variation of the deep azimuthal resistivity can give information of the aperture of high-angle fractures and their position relative to the borehole.

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Section: Introductionmentioning

confidence: 99%

Numerical simulation of high-resolution azimuthal resistivity laterolog response in fractured reservoirs

Deng

Li³

et al. 2015

Pet. Sci.

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Resistivity Modeling of Array Laterolog Tools: An Application in an Offshore Norway Clastic Reservoir

Galli¹,

Gonfalini²,

Mele³

et al. 2002

All Days

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractResistivity logs, as directly used for the determination of Water Saturation profiles, have always been of focal interest for the oil industry; it's clear that the quality of these measurements, currently used in the net pay and hydrocarbonin-place determination, must be very high. As a consequence, more accurate and flexible resistivity tools have been developed in recent years. We are addressing here the family of array tools, and especially the HRLA 1 , which makes available a set of 5 galvanic resistivity measurements at different depths of investigation.Unfortunately, the most common types of environmental noise (borehole effects, shoulder bed resistivity contrasts, invasion, the presence of dips, anisotropy), still alter the measured resistivity, thus affecting the estimation of the true resistivity in hydrocarbon bearing levels.In order to remove these alterations, Schlumberger, in cooperation with ENI-AGIP, has developed a 2D resistivity modeling & inversion technique that can simultaneously correct a number of environmental effects. This paper presents the results obtained in two wells of a reservoir in the offshore Norway area where the sandstone bodies are interbedded with deltaic shales. The values of porosity and permeability are generally very high and a complete set of data (conventional & special core analysis, conventional wireline logs, microresistivity imaging logs, NMR, sedimentological analysis from core and images) is available. Mark of SchlumbergerThe 2D modeling provided a better definition of the water saturation in the thinner sandstone bodies of the sequence and in the presence of anomalous invasion profiles.When comparing the resistivity modeling results with those obtained by standard interpretation techniques, we can see the effectiveness of the developed methodologies (both hardware and software) in improving the reservoir characterization and in maximizing the return of the investments in logging and well data measurements.

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High Resolution From a New Laterolog With Azimuthal Imaging

Cited by 2 publications

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Numerical simulation of high-resolution azimuthal resistivity laterolog response in fractured reservoirs

Numerical simulation of high-resolution azimuthal resistivity laterolog response in fractured reservoirs

Resistivity Modeling of Array Laterolog Tools: An Application in an Offshore Norway Clastic Reservoir

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