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Keywords: porosity
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Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0044
..., each trying to correct its predecessor. After triple combo logs are predicted from MWD logs, a physics-based joint inversion model is applied to estimate reservoir properties such as total porosity, clay volume, water saturation, volumetric concentrations of lithology, permeability, rock type...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0067
...) assuming constant properties for shale layers and grain-coating clay, and (ii) T-S diagram axes (porosity-shale volume) are not readily available measurements. We also introduce a permeability model for arbitrary shaly sandstones that accounts for both sandstone-shale laminations and graincoating clay...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0084
... acquired in key wells that incorporate expert knowledge, depth-matched core porosity with log-calculated porosity, generated two support systems (core and log resolution), and trained with the predicted porosity and smoothed permeability. Feature engineering is implemented on the resulting data suite...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0050
... to identify hydrocarbons, compute saturations, and generate permeability models. We then build a petrophysical model, for the formations of interest, which is applied to multiple wells in the area. This methodology directed us to ideal landing zones with the highest porosity, lowest water saturation...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0007
... components. Carbon-oxygen ratios (C/O) of elemental yields are then compared to a reference model to determine the relative saturation and porosity-filled volume of oil and water. In PNC (pulsed neutron capture) acquisition mode, a salinity dependent oil-water saturation assessment is determined from neutron...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0078
... ABSTRACT Pulsed neutron gamma energy spectroscopy and neutron lifetime measurement systems enable the evaluation of elemental content and the degree of saturation, and recent research has proved that the system can be used to determine neutron porosity. Algorithms introduced in the past have...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0042
... porosity drilling fluid chemistry drilling fluid formulation reservoir simulation upstream oil & gas rock type flow in porous media drilling fluid selection and formulation invasion united states government complex reservoir th annual logging symposium university numerical simulation mud...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0028
... and relative permeability in the high porosity chalk is complicated by both low permeabilities and heterogeneity. The main challenge with chalk is that flow occurs in a nano-environment. Physically, the nano-environment translates to low permeability, difficult rock preparation, and extensive experimental time...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0051
... along with porosity to build a model for permeability estimation after it calibrated with core data. This method was tested with log data and demonstrated promising results for carbonate pore system characterization. Total porosity is partitioned based on the six pore types with corresponding pore body...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0027
... ABSTRACT The Thomas-Stieber (TS) model is used to identify the clay geometry (dispersed versus laminated and structural clay) in thin bedded, shaly sand reservoirs. This model distinguishes the clay laminations from dispersed clay and sand by calibrating the different rates of porosity change...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0081
.... First, we conduct conventional formation evaluation to estimate petrophysical properties such as porosity, permeability, water saturation, and volumetric concentrations of minerals. Then, we employ conventional well logs with a feature ranking method for feature selection prior to model training...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0054
.... This genre of logs has been the go-to technology for evaluation of porosity and saturation through casing for decades, owing to the efficacy of the measurement physics in cased wells, and to the versatile form factor of the tool itself. Modern pulsed-neutron logs are typically 1-11/16 in. (43 mm) in diameter...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0034
... and diagenetic processes generated a porous medium with vugs, fractures, and caves of various sizes that are rarely appropriately sampled. In intervals with large pores, samples collected will represent the rock matrix, underestimating laboratory measurements such as porosity and permeability. Although...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0033
... rock reservoir using an Inversion-Recovery CMPG pulse-sequence on a 12 MHz NMR instrument. The acquired 2D data was inverted using an optimized inversion software: MUPen2D. We then obtain oil and water content in the plug from the 2D T1-T2 NMR using an inhouse developed NMR MATLAB App. The porosity...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0012
... with the capillary pressure-based rock types and characterize the factors affecting reservoir quality and fluid flow. The results of rock typing models revealed that the reservoir quality of the Bakken formation is highly controlled by porosity and permeability along with the variation of grain size, cementing...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0058
... cycles of injection/depletion on reservoir properties to be studied. In this paper two different clastic sedimentary samples (Boise and Castlegate sandstones) are studied. They exhibit a significant difference in porosity, grain size, and minerology. These microstructural features are believed to control...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0032
.... Geological sequestration (GS) includes depleted oil and gas reservoirs, coalbed methane, shale gas reservoirs and aquifers. Aquif ers have the greatest potential because of their relative abundance, but shale reservoirs are attractive in terms of areal extent, multiple porosity systems, and CO2 adsorption...
Proceedings Papers

Paper presented at the SPWLA 64th Annual Logging Symposium, June 10–14, 2023
Paper Number: SPWLA-2023-0049
..., the analyses could be performed on-site. NMR logging was employed in many of the well intervals under consideration. The comparison between porosity derived from NMR logs and that derived from neutron/density logs was used to indicate the presence of solid bitumen. The results from four wells drilled within...

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