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Keywords: conductivity
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Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0011
... permittivity in the z direction (i.e., the real part of the dielectric permittivity) decreased with an increase in the aspect ratio of the spheroid grains. The electrical conductivity (which is associated with the imaginary part of the dielectric permittivity) decreased as the grains became flatter, which...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0092
.... ABSTRACT Formation dielectric dispersion is known to be affected by reservoir wettability. In the typical downhole dielectric tool frequency range in MHz GHz, a hydrocarbon-wet reservoir generally has a reduced conductivity with a less dispersive permittivity response. To capture the effect of wettability...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0006
... is higher than in shale-gas-type reservoirs and sets the two apart. Another differentiation is that for a repository, one would only consider shales with a low total organic content Shale sequences exhibit very low hydraulic conductivity and diffusivity. Their retention capability over millions of years has...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0038
... jointly by the Society of Petrophysicists and Well Log Analysts (SPWLA) and the submitting authors. This paper was prepared for presentation at the SPWLA 64th Annual Logging Symposium held in Conroe, USA, June 10-14, 2023. ABSTRACT Assessment of fluid conductivity of fractures in interbedded formation...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0114
... fracture to a rough fracture with a fractal dimension of 3 led to an increase in the relative dielectric constant by more than one degree of magnitude while the sample conductivity decreased by 40%. Changing sample saturation from 100% water saturation to 100% hydrocarbon saturation decreased the relative...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0118
... induction tool. However, the SNR of raw conductivity signals under such background is very low with negative value exist for some coils with short T-R spacing. As a result, array Rt logs with different DOI from the classic "software focusing" algorithm overlaps and flattens out, which is too poor for fluid...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0004
... Abstract From the first wireline log in 1927, formation evaluation always had to provide estimates for water saturation to identify and quantify hydrocarbon-bearing reservoir rocks. Formation conductivity (or resistivity) was the single leading quantity for input to various saturation models...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0022
... pairs. In this frequency range, the measurements are sensitive to both the electric conductivity and dielectric permittivity in surrounding rock formations. Tool response to these two parameters has been characterized by modeling and is well known after many decades of study and analysis. However...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0001
.... However, Archie's model filled a void in formation evaluation, and works well. Four decades would pass before researchers began to attempt to connect conductivity in rocks as described by the Archie model to first principles. Since 1980 several attempts to connect the Archie model to first principles were...
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...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0035
... Abstract A Staged Differential Effective Medium (SDEM) model based on the Hanai-Bruggeman equation is applied to interpret water saturation in shaly sands. In this model, the conductivity of the formation changes when different volumes of clays, oil, and quartz (inclusions) are successively...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0073
... Abstract A major question in the interpretation of resistivity measurements is when rock components other than saline water need to be taken into account and the boundary of reliability of conventional resistivity models. In the case of organic-rich mudrocks, the effective conductivity...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0084
... waxman-smit model estimation lamination conductivity resistivity image log rock class archie Abstract Reliable assessment of hydrocarbon saturation is essential for reserves evaluation, which can be straightforward using resistivity well logs in formations with well-connected pore...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0089
... amplitude response annual logging symposium permittivity flowback reservoir characterization upstream oil & gas natural fracture logging symposium th annual logging symposium spwla 63 symposium conductivity complex reservoir modeling em response geometry spwla-2022-0089 rd annual...
Proceedings Papers

Paper presented at the SPWLA 63rd Annual Logging Symposium, June 11–15, 2022
Paper Number: SPWLA-2022-0081
... and defines an electric vector potential function to describe the transient electromagnetic field excited by the electrode. The radial eddy currents and circular magnetic fields in the conductive ring of the Doll formation are analyzed by the retardation potential. According to the reciprocal symmetry...
Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0035
... field cases, the dielectric constant can be tens to hundreds, making it measurable directly from propagation data. Factors causing this high dielectric constant include connate water volume, the interfacial polarization due to clays, and the Maxwell-Wagner effect as a result of coexistence of conducting...
Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0039
... conductivity em data spwla-2021-0039 university wellbore lwd spwla 62 nd annual logging symposium component data well path upstream oil & gas offset well inversion collision proximity SPWLA 62nd Annual Logging Symposium, May 17-20, 2021 DOI: 10.30632/SPWLA-2021-0039 DETECTION OF OFFSET...
Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0074
... network well logging upstream oil & gas spwla 62 regression swa annual logging symposium nd annual logging symposium archie anisotropy moran gianzero coefficient spwla-2021-0074 laterolog conductivity horizontal resistivity water saturation anisotropy coefficient resistivity...
Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0052
... Abstract Conventional resistivity models often overestimate water saturation in organic-rich mudrocks and require extensive calibration efforts. Conventional resistivity-porosity-saturation models assume brine in the formation as the only conductive component contributing to resistivity...

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