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Keywords: inversion
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Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0056
... of acquisition time and thus yields good data quality that can then be used for unsupervised inversion. The only influencing components in the inversion are the data weights derived from the repeated measurements (stacking weights). The resulting sensitivities show us that the data is sensitive to a depth...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0071
... of bypassed reserves and the planning of additional target wells to intercept these zones. This paper illustrates the application of 3D Ultra-deep azimuthal resistivity (UDAR) Inversion in one of the major chalk reservoirs to map the variability of fluids, enabling bypassed pay zones to be targeted thereby...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0060
... in slow formations), this paper will be concerned with the development of two inversion methods that allow us to obtain formation shear slowness from WL dipole (flexural) and/or LWD quadrupole waves. The methodology is SFC-based and a generalization of that proposed by Tang et al. (2010). We consider...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0070
...SPWLA 64th Annual Logging Symposium, June 10-14, 2023 DOI: 10.30632/SPWLA-2023-0070 3D ELECTROMAGNETIC MODELING AND QUALITY CONTROL OF ULTRADEEP BOREHOLE AZIMUTHAL RESISTIVITY MEASUREMENTS Sofia Davydycheva (3DEM Modeling & Inversion JIP), Carlos Torres-Verdín, Junsheng Hou, Wardana Saputra...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0051
... close to one) through the inversion of an effective medium rock physics model using acoustic compressional and shear measurements. We then add the micro- and macroporosities inferred from NMR interpretation to determine the volume fractions of six pore groups (microcrack, micro reference, micro stiff...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0082
... being investigated, UDAR measurements depend on many formation parameters and require complex multi-layer formation models used in the interpretation as well as new effective inversion approaches. Stochastic inversion algorithms have many advantages and are used extensively in borehole field...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0036
..., 500KHz, and 2MHz) to allow a greater selection of measurements for structure inversion/interpretation optimal to the particular geology and application. Incorporating long spacing 2MHz directional resistivity measurements, the multilayer bed mapping technology confirmed and accurately interpreted...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0038
... of the direct signal to the secondary Stoneley wave created by this effect gives an estimate of effective fracture width or fluid conductivity by using a wide-band frequency inversion model by Kostek et al (1998). By combining Stoneley fracture analysis with the LuthiSouhaite fracture computation from high...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0026
... will study its application to the processing of NMR logging data. This paper concentrates on two common practical problems in NMR logging process and proposes the denoising framework for echo signals and networks for the inversion of spectra based on deep learning. NMR forward simulation dataset...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0055
... on pressure, temperature, and acquisition environment. The outcomes of the first step lay the groundwork for the definition of the most effective PNL interpretation approach, as appropriate. In detail, after the selection of fit-forpurpose curves and their physics-based models, a joint inversion is performed...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0101
... plugs to approximate T2 distributions at 100% water saturation, and each approximation was subsequently compared with actual measurements of the fully water-saturated plugs. Finally, this paper presents a new FS method for carbonate multimodal pore systems. It consists of a nonlinear inversion method...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0004
... measurements. Thus, the new dielectric-inversion algorithm provides the radial permittivity profile, which directly leads to a radial water-saturation profile. The radial depth of this profile depends on the transmitter spacing; it may reach out to a radius of forty inches, so is truly deep for the early-time...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0022
.... One way to analyze the problem is to directly invert the measured attenuation and phase shift data to obtain formation conductivity and permittivity. The inversion must be separately performed at each operating frequency to account for dispersion. The algorithm described in this paper was developed...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0038
... with conductive beds. Iterative forward modeling inversion is applied to estimate the formation resistivity from the log resistivity. The inversion has to assume an earth model. Iterative forward modeling inversion is time consuming by nature. The inversion is empirical as the regularization coefficient has...

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