... salinity electric field brine equation figure 9 porosity SPWLA 66th Annual Logging Symposium, May 17-21, 2025 DOI: 10.30632/SPWLA-2025-0007 COMPLEX PERMITTIVITY OF SHALE AND BRINE: CORE ANALYSIS RESULTS AND INTERPRETATION Seán Dolan1, Nishank Saxena2, Ronny Hofmann2 & Matthew Josh3. 1Shell...

... ABSTRACT The presence of solid bitumen in a deep carbonate reservoir formation (Kuwait) occludes primary inter-crystalline porosity and thus impacts permeability. Here we describe a petrophysical model to both quantify in situ solid bitumen and estimate the effect of this bitumen on reservoir...

... ABSTRACT NMR log relaxation time distributions (T2 or T1) are essential for deriving petrophysical properties such as porosity and pore structure. However, their accuracy is often constrained by factors such as data quality, activation sequences, and inversion techniques. Traditional...

... calculation of the sample's internal porosity. Integrating this analysis with advanced mathematical statistical methods facilitates a thorough evaluation of the sample's internal pore structure and fluid distribution. Analyzing the T 1 spectra alongside imaging facilitates a direct assessment...

... reservoir simulation geologist mineral rock type well logging permeability electrical tortuosity rock class university tortuosity reservoir characterization integration porosity workflow solid line flow in porous media log analysis hydraulic tortuosity annual logging symposium artificial...

..., are designed to simulate key early-stage interactions between CO2, rock, and fluid. A comprehensive suite of characterization techniques was employed to capture changes in the rock's physicochemical and mechanical properties. These techniques included Routine Core Analysis (RCA) to measure porosity...

... was utilized for porosity evaluation and pore structure analysis. Ultimately, the petrophysical parameters, production logging data, and well production data were analyzed by using an artificial intelligence method to classify the reservoirs into three different groups and established a reservoir quality...

...) and porosity, and acoustic PAR provides an indicator of the effect of dolomitization on rock quality. Integration of these analyses indicates that dolomitization alters rock quality through changes to pore structure, including PAR, pore size, and porosity. The main objective of this study is to further test...

... continuous source of information for the inter-well spacing. Seismic inversion results, namely acoustic impedance and compressional to shear velocity ratio (Vp/Vs) provide hard data for the analysis. Required properties, such as total porosity, free fluid porosity and bounded water volume were estimated...

... ABSTRACT The estimation of permeability from well logs is a challenging task in formation evaluation. The models usually employed calculate permeability from a function of porosity. The average permeability of an interval will be underestimated when using low-resolution porosity logs, which...

... a clear and robust correlation between the dissolution process and pore geometry structure, providing a solid foundation for the methodology. This is an additional equation for quantitatively specific surface area in the porosity-permeability relationship. This updated pore geometry-structure rock typing...

... and permeability. To obtain a reliable interpretation, it was essential to have precise knowledge of reservoir characteristics, such as total porosity, permeability, connate water salinity, and Archie's coefficients (m and n). These properties play a vital role in defining water saturation and in predicting...

... structure, and the oil accumulation spaces. Lastly, the geological model and geological evolution of this deep-buried carbonate reservoir were established for the first time. INTRODUCTION The carbonate reservoir, being deeply buried, exhibits strong heterogeneity, with porosity ranging from 1% to 10...

... underbalanced coil tubing drilling. As well known, various polarization mechanisms give rise to the dielectric effect at LWD frequencies and make the dielectric permittivity especially dispersive at this frequency range. In addition, formation porosities may be derived from wireline (WL) dielectric...

.... Because the reflection of the miniature radar echo is directly related to the impedance contrast between the OBM and the formation, it is natural to compute the wave impedance of the formation in terms of matrix permittivity, water-filled porosity, and water salinity. The traditional Archie's equation...

... of the components. For example, one can construct a rock with 60% calcite shrubs with an average radius of 200 micrometers and a standard deviation of 50 micrometers, with 30% dolomites among them, resulting in 10% inter-crystalline porosity. Subsequently, the calcite shrubs can be partially dissolved or replaced...

... and the radius of invasion. In the second step, petrophysical properties (porosity, mineral/fluid composition, water saturation) are estimated through an interior-point method, jointly inverting both radial zones with consistent rock properties and variable fluid saturations. Once physical properties...

... solubility in water was investigated by dissolving CO 2 in brine and then aging carbonate rock samples in the carbonated brine. The aging was conducted at 2,500 psi and 90°C for 1-, 3- and 6-month periods to simulate reservoir conditions. Petrophysical measurements of porosity, permeability, ultrasonic...

... ABSTRACT Many large-scale studies have attempted to understand traditional key reservoir properties (e.g., porosity, oil saturation, water saturation) and formation-specific properties (e.g., carbonate, quartz, and clay content, key facies, etc.). The aim of these studies was to select...

..., with porosity as a trend variable, due to its excellent fit to experimental data and clarity in associating equation parameters with geometric properties of porous systems related to fluid saturation and distribution. Porosity, the petrophysical property with the lowest uncertainty propagation on 3D geological...