.... 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...

... well-established equations in the industry to model the first drainage oil-water experimental curves in various facies of carbonate rocks from oil-bearing Pre-Salt reservoirs in the Santos Basin, Brazil. The Brooks-Corey mathematical model proved outstanding in constructing 3D planar rock facies models...

... 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 Petrophysics analysis provides different ways of estimating permeability. These methods include RQI-FZI, NMR based Timur-Coates or SDR equations, different methods of estimating permeability based on Stoneley wave and many more. In the well with comprehensive logging suite...

... for detecting bonding information beyond the second pipe. This paper uses the classic modal analysis method to examine the modal waves in a double-pipe system. The governing matrix equation for wave propagation is generated based on the boundary conditions at each pipe's internal and external interfaces. We...

..., achieving good correlation between the curves. Leveraging the relationship between image amplitude and impedance and inspired by the relationship between impedance and porosity, we proposed a polynomial equation relating impedance to porosity, which is adjusted to the data to minimize the least error while...

... equation spwla-2025-0040 track show threshold segmentation heavy oil play saturation carbonate reservoir spwla 66th algorithm well logging occurrence state resistivity annual logging symposium segmentation th track show SPWLA 66th Annual Logging Symposium, May 17-21, 2025 DOI: 10.30632...

... and water saturation (SW) using gas and mud logging data. The approach used in this work is based on the Beda & Tiwary equation (B&T), a technique employed to estimate water saturation while drilling. This equation bears similarities to the known Archie equation, which also determines water...

... respond to the missing cement ring in different directions and perform an imaging display, which can visualize the missing cement ring in different directions. In this paper, the diffusion equation of gamma rays under double-layer casing conditions is derived for the process of gamma particles interacting...

... model suitable for various completions and cement property scenarios. This allows the proper estimation of microannulus thickness downhole using ultrasonic log data. Next, the obtained value is used as input to Poiseuille's equation for the final behind casing flow rate estimation. The model also relies...

... hydrocarbon production. geologist mudrock petroleum geology clastic rock rock type well logging structural geology th annual logging symposium geochemistry mudstone geochemical characterization reservoir characterization pimenteira formation geological subdiscipline equation sedimentary...

...). At equilibrium in an oil reservoir, Pc may be calculated based on the following equation: (equation) sedimentary rock fluid dynamics rock type saturation structural geology reservoir geomechanics core analysis economic geology th annual logging symposium spwla 65 doi flow in porous media...

... of tubes to propose petrophysical interpretations for the Multi-Weibull parameters and compute the MICP-based absolute hydraulic permeability through pore-dimension Kozeny-Carman equations. We then use the MICP-based permeability to test rock classification through Lucia's rock-fabric and Amaefule's flow...

... well logging geological subdiscipline correction hydrocarbon correction spwla 65 algorithm moduli reservoir characterization anisotropy th annual logging symposium evaluation shear moduli annual logging symposium equation calibration vorobiev SPWLA 65th Annual Logging Symposium, May...

... length scale, clay laminations, are the last phase added to the massive sand matrix. The final equations include the distribution parameters for each inclusion. The results of applying an integrated model are presented for resistivity and measured permeability. INTRODUCTION In clastic reservoirs...

... analysis data quality artificial intelligence reservoir characterization th annual logging symposium evaluation assessment algorithm spwla 65 abnormal waveform correlation coefficient spectrum equation well logging machine learning spwla-2024-0130 threshold operation receiver...

... ), laminated clay ( X l ), and structural clay ( X s ) all to be determined. The approach begins with the derivation of the equations for porosity, gamma-ray response, and effective P-wave slowness. These equations are formulated introducing the clay distributions into the matrix using a Wyllie's time...

... ABSTRACT Global equations for predicting GOR , API gravity and saturated viscosity from downhole testing and sampling measurements have been developed using a symbolic regression (SR) machine learning method. Nearly 700 fluid samples collected from more than 500 wells from many parts of world...

... (i.e., the ratio of the radius of the major axis to the radius of the minor axis) and grain sizes for spheroids. Next, we numerically alter the water saturation. We perform frequency-domain dielectric permittivity simulations (through the solution of Maxwell's equations in the frequency-domain...

.... These empirical equations can be used by geophysicists to derive effective stress profiles from seismic attributes with an acceptable uncertainty before a well is drilled. upstream oil & gas asia government geologist structural geology plate tectonics united states government well integrity...