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Keywords: borehole
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Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0060
..., June 10-14, 2023. ABSTRACT In slow formation borehole acoustic Wireline Logging (WL) and Logging While Drilling (LWD) it is common to obtain formation shear slowness from the dispersive borehole guided flexural and quadrupole wave, respectively. Due to poor signal to noise ratio (predominantly LWD...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0006
... without any bias or predeposition. DATA AVAILABILITY Nowadays, each of the 16 German federal states is responsible for documenting local geology by geophysical surveys or boreholes. Data required for the site selection process in Phase I are provided by the geological surveys. These data are assessed...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0122
... resistivity tool. The higher frequencies were carefully chosen to improve the measurability of the quantities. A detailed modeling study was performed to investigate the tool characteristics including (1) depth of investigation, (2) vertical resolution, (3) sensitivity to resistivity anisotropy, (4) borehole...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0118
.... It features low matrix porosity and high resistivity larger than 200 .m, even 2000 .m at some specific sections. This formation is often buried below a layer of gypsum, so many wells are drilled with oil-based mud ensuring borehole stability. It leaves no choice of resistivity logging other than the array...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0079
... seeds for simultaneous inversion on models of varying complexity. The fast inversion algorithm generates formation resistivity profile above and below the borehole. As resistivity is related to lithology and fluid types, a geosteering engineer can intuitively carry out quantitative steering task...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0074
... Abstract Resistivity and acoustic near-wellbore characterization techniques are increasingly used to provide structural definition and fractures identification. The two log types are complementary, often showing ability to compensate for borehole conditions and lithology uncertainty. Image...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0076
.... well logging trajectory design reservoir characterization directional drilling constraint stratigraphic correlation well planning upstream oil & gas correlation borehole interpretation interface information pilot well spwla-2022-0076 rd annual logging symposium pilot hole inversion...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0108
... cement and bond evaluation annual logging symposium log analysis upstream oil & gas receiver wavefield reservoir characterization casing and cementing borehole well logging correlation acoustic tool spwla 63 compressional slowness waveform arrival time spwla-2022-0108 cbl...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0100
... understanding of these complex cases, using the azimuthal variation of the high-resolution ultrasonic pitch-catch P&S slowness and high-definition ultrasonic pulse-echo images. INTRODUCTION A recently developed LWD dual ultrasonic tool provides high-resolution formation P&S slowness and borehole images...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0101
... images provide 0.2 in. resolution, the highest possible resolution for well logs, enabling detailed reservoir characterization at the borehole wall of key geological events. In this paper, we demonstrate how this plethora of information provided by such imagers can be used to identify borehole wall...
Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0060
... value is first determined by matching the modeled and measured waveform data for the well bonded condition. Using the stiffness value as a reference, the stiffness values for the borehole section of interest are inverted by minimizing the modeled and measured waveform data, resulting in a continuous...
Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0021
... methodology. A correlation between the two is established, enabling an intrinsic C/O log output. Eleven laboratory physical tests and 120 Monte Carlo simulated case studies are conducted. Systems investigated include sandstone and limestone with different porosities and fluid saturations. Borehole sizes...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5016
... ABSTRACT Full geological interpretation is now possible from logging-while-drilling (LWD) in oil-based mud following the advent of high-resolution acoustic borehole imaging technology. The new service provides acoustic amplitude images of the borehole wall, in addition to borehole shape...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5061
... by the presence of multiple casing strings and completion hardware in the borehole, with variable annular and near-wellbore fluids. Every measurement is used and interpreted in relation to its statistical uncertainty and level of interpretability. In a complex scenario, near-wellbore conditions and well dynamics...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5009
... and would be a natural fit for measuring chlorine concentration, if not for the fact that the spectrum contains chlorine gamma rays from both the formation and borehole. The borehole chlorine background can be large and is highly variable from well to well and along depth. Historical efforts to derive water...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5019
... need for a dispersion correction. In acoustic well logging, many of the waves propagating inside the borehole are dispersive, such as wireline dipole and LWD quadrupole waves for the determination of formation shear slowness, and leaky P wave for compressional slowness in soft formations. Only at low...

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