... permittivity measurement (i.e., dielectric constant and conductivity) is dominated by the volume and salinity of brine in the pore space, whereas at lower frequencies the measurements are increasingly sensitive to how the water is distributed within the porous rock, i.e., the rock texture. In wet shale...

... ABSTRACT Bitumen is a highly carbon rich polycyclic hydrocarbon compound with low conductivity, similar to the resistivity logging response characteristics of oil and gas. It is easy to mistake the bitumen filled in the pores for oil and gas reservoir during logging interpretation...

... salinity fluid dynamics rock type log analysis machine learning resolution pirrone th annual logging symposium modeling conductivity cec SPWLA 65th Annual Logging Symposium, May 18-22, 2024 DOI: 10.30632/SPWLA-2024-0055 PHYSICS-BASED PROBABILISTIC PERMEABILITY PREDICTION IN THIN-LAYERED...

... were encountered in the well, or simply from a different factory batch, or the situation behind the pipes changed (for example, a casing string ended). well logging probe log analysis diameter permeability casing and cementing thickness pipe spwla 65 conductivity algorithm generator...

.... In this multifrequency range, the medium becomes electrically polarized when small fractions of clay or metallic minerals are present. Building on this premise, we conducted measurements of both real and complex electrical resistivity on 13 carbonate rock samples from the Sergipe sub-basin. We fitted amplitude and phase...

... in a comparison with wireline dielectric measurements conducted in much higher frequencies. In this study, several methods are evaluated in obtaining dielectric permittivity from LWD EM measurements of 400 kHz and 2 MHz frequencies: Method 1 is an analytical Resistivity Based Approximation (RBA); Method 2...

... data processing workflow is implemented, involving multi-zone calibration and model-based inversion. This intricate process facilitates the estimation of critical parameters such as the electrical conductivity, magnetic permeability of the tubulars, wall thickness, and eccentricity. In addition...

... the exact brine solutions and salt concentrations defined for the pore-scale analysis. The dielectric permittivity measurements were conducted using a network analyzer with a high-temperature coaxial probe setup in the frequency range of 300 MHz to 3 GHz. We observed that relative permittivity at 1 GHz...

... ABSTRACT Assessment of fluid conductivity of fractures in interbedded formation types is challenging for resistivity imagers due to non-unique electrical conductivities of fluid and fracture fill. Natural fractures can enhance formation permeability and improve fluid flow; thus...

... 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...

... government artificial intelligence mudstone th annual logging symposium conductivity diffusion sequence shale sequence spwla 64 borehole diffusivity shale tortuosity shale-hosted nuclear repository SPWLA 64th Annual Logging Symposium, June 10-14, 2023 DOI: 10.30632/SPWLA-2023-0006...

... ABSTRACT The Waxman-Smits formula was introduced in 1968 as a parallel conductance model to improve previous models. A careful inspection of Waxman's and Smits model reveals it is not a parallel conduction model by the conventional definition. First, Waxman-Smits assumed that "the electrical...

... 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...

... to 0.01 MHz. Increasing fracture surface roughness from a completely smooth slit-like 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...

... 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 induction tool. However, the SNR of raw conductivity signals under such background is very low with negative value exist...

... 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...

... 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...

.... 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...

... 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...

... 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...