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Keywords: frequency
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Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5008
... production logging machine learning well logging completion installation and operations casing and cementing well integrity outer barrier outer surface upstream oil & gas thickness production control reservoir surveillance casing design frequency excitation july 29 spwla 61 synthetic...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5034
... ABSTRACT The sonic wave fields produced by wireline and loggingwhile- drilling (LWD) monopole, dipole, and quadrupole tools often consist of multiple borehole modes. Classic frequency-semblance methods used to process this data often detect only strongly excited modes and overlook weak ones, or...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5044
... reservoirs, challenges in their formation evaluation remain to be addressed. log analysis reservoir characterization well logging structural geology frequency permittivity spwla 61 water-filled porosity shale gas upstream oil & gas water salinity salinity symposium permian basin...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5041
... prediction of oil and gas production. In this paper, we used three groups of rock samples to study the relationship between water saturation Sw and complex resistivity of homogeneous and fractured rock samples at middle and low frequency(100–10KHz). The electrical and dielectric properties of the fractured...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5010
... is able to function at high frequencies (in the MHz range) in oil-based muds. To allow for the quantitative estimation of formation and mud properties from the HROBMI data, a hybrid machine-learning/inversion approach was implemented. In this hybrid approach, machine-learning models corresponding to...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5045
... simultaneously from low frequency (∼20 kHz) field induction measurements. We processed many wells penetrating these anomalously low-resistivity formations to determine if they had a distinct resistivity-dielectric permittivity pattern. We found that some anomalously low resistivity kerogen-bearing formations...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5015
... resistivity images only. The latest-generation wireline oil-based-mud microresistivity imagers operate in the megahertz frequency range, radiating the electrical current capacitively through the nonconductive mud column and delivering photorealistic borehole images. Both electrical conductivity and...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5019
... frequency does the speed of these waves approach the true formation value, the wave speed being slower at higher frequencies. Slowness processing can therefore be influenced by strong high frequency waves, resulting in measured slowness values greater than the true formation values. The new method...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-D
... controlled saturation levels that are verified with independent methods. A second limitation is the lack of well understood and calibrated models for interpreting and inverting advanced, multi-frequency dielectric logs. CSIRO is embarking on a program to collect standardized dielectric spectroscopy data on...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-LL
... well decommissioning bond log mineralogy shale formation abandonment log analysis Symposium frequency shale annular barrier identification amplitude deformation norsok regulation annular barrier SPWLA 60th Annual Logging Symposium, June 15-19, 2019 DOI: 10.30632/T60ALS-2019_LL 1 TURNING...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-VVVV
... ε at multiple frequencies (f) , also known as the dispersive permittivity (ε (f)). Drawbacks with these tools are that they respond to the invaded zone and the data must be acquired on wire-line and therefore is not always accessible. Logging While Drilling ( LWD ) propagation resistivity...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-OOO
... guided wave that travels along the borehole wall with an apparent slowness (inverse of velocity) that is dispersive. The low-frequency asymptote of this dispersion indicates the formation shear slowness, which is usually measured with a time-or frequency-domain semblance method. Modern borehole acoustic...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-DD
.... Another one is the inversion-based workflow, which is an alternative quantitative interpretation, providing a higher quality resistivity image, button standoff, and formation permittivities at two frequencies. In this work, a workflow based on artificial neural networks (NNs) is developed for quantitative...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-W
... ε at multiple frequencies (f) , also known as the dispersive permittivity (ε (f)). Drawbacks with these tools are that they respond to the invaded zone and the data must be acquired on wire-line and therefore is not always accessible. Logging While Drilling ( LWD ) propagation resistivity...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-U
... waves excited by a quadrupole source in an LWD environment is that their nonleaky cutoff frequency slowness is the formation shear slowness. However, the slowness data near this cutoff frequency are often influenced by noise or the presence of other modes because of the low excitation amplitude...
Proceedings Papers

Paper presented at the SPWLA 60th Annual Logging Symposium, June 15–19, 2019
Paper Number: SPWLA-2019-GGGG
... logging frequency drilling risk well placement transmitter University real time system log analysis Upstream Oil & Gas detection em look-ahead Symposium reservoir machine learning drilling operation calibration spwla 60 Schlumberger resistivity Artificial Intelligence Thickness...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-MM
... gap filters and contrast agents at specific frequencies. The resultant acoustic signature can thus be analyzed to determine the mechanical integrity of the cement as well as the mechanical stress experienced by the cement. During the development of this technology, finite element analysis and...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-MMM
... limited by physics and large suites of multidimensional data. However, improving efficiency cannot come at the cost of the accuracy of the answers. Recent work shows that optimization of a single frequency of operation (that is, a single depth of investigation [DOI]) provides only modest efficiency gains...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-BBB
... polarization mechanisms at different frequencies, which are affected by porosity, grain-size distribution, and wettability. Thus, a multi-frequency interpretation of dielectric measurements can provide information about volume of fluids as well as solid-fluid interfacial properties, such as wettability and...
Proceedings Papers

Paper presented at the SPWLA 59th Annual Logging Symposium, June 2–6, 2018
Paper Number: SPWLA-2018-MMMM
... ABSTRACT A new log-visualization approach uses the frequency-domain azimuthal anisotropy algorithm of Collins (2012) to provide insight into the anisotropy mechanism using a continuous log presentation. Conventional cross-dipole azimuthal acoustic anisotropy is processed routinely in the time...

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