... 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...

... these classical approaches require manual input, leading to a degree of subjectivity in formation evaluation. ABSTRACT General machine learning-based algorithms have been developed to predict important matrix properties and an estimate of their uncertainties. Grain density, neutron porosities, cross sections...

...SPWLA 63rd Annual Logging Symposium, June 10 to June 15, 2022 DOI: 10.30632/SPWLA-2022-0116 QUANTIFYING THE EFFECTS OF HEAVY MINERALS ON THERMAL NEUTRON POROSITY IN PERMO-CARBONIFEROUS SANDSTONE Olusegun Akinyose, Tariq Alshaikhmubarak, Saudi Aramco, Marie Van Steene, Laurent Mosse, Schlumberger...

... methods to predict one of the following logs: density, neutron porosity, gamma ray, or compressional slowness. We assume only one missing log at a given interval. Sequence-based methods can capture serial context information that allows for prediction in zones with depth-shifted logs, as well as using...

... are reasonably consistent across multiple wells. Manually correcting logs for consistency is laborious, subjective, and error prone. For some logs, such as gamma ray and neutron porosity, systematic inconsistencies or errors can be caused by borehole effects as well as miscalibration. Biased or consistently...

..., this could lead to an overestimation of the oil saturation of the uninvaded zone, as suggested by the comparison with sigma-based saturation computation. A comprehensive evaluation approach that integrates cased-hole neutron porosity and sigma, elemental dry weights from capture and inelastic spectroscopy...

... independent formation property measurements was deployed to enhance knowledge of the formation parameters while describing the current gas and oil volumes. Sigma, neutron porosity, fast-neutron cross section (FNXS), and elemental concentrations including total organic carbon from inelastic and capture...

... complex form of the bulk density and porosity equations. In gas- bearing formation, the authors proposed an approximate gas-corrected porosity as the square root of the half-sum of the square of the density and neutron porosities. In the original paper, the neutron porosity excavation effect...

... well logging endpoint machine learning Upstream Oil & Gas Artificial Intelligence kerogen property thermal maturity interpretation porosity Symposium matrix log analysis vitrinite reflectance inversion kerogen organic shale neutron porosity determination kerogen density...

... perturbations: neutron porosities simulated using DFD- perturbed and MC-derived FSFs agree within one porosity unit (p.u.) in highly deviated wells, enlarged boreholes, and wells with invasion. They significantly outperform linear interpolation approaches, reducing errors in estimated porosity by as much as 10...

... Upstream Oil & Gas spwla 59 pulsed neutron detector neutron neutron tool well logging porosity measurement neutron porosity slowing-down length salinity effect formation response log analysis burst ratio porosity borehole effect Symposium capture ratio neutron porosity...

... neural network machine learning flow in porous media well logging Upstream Oil & Gas core permeability prt constraint cutoff neutron porosity Symposium core sample PRT rock type cutoff value classification porosity pore throat estimation permeability Fluid Dynamics spwla 59 core...

... ABSTRACT Neutron porosity measurements are heavily used in formation evaluation together with density and resistivity logs. Although this measurement provides a good porosity value for a clean formation, it is easily influenced by conditions in the borehole and in the formation being evaluated...

...SPWLA 58 th Annual Logging Symposium, June 17-21, 2017 1 AN ASSESSMENT OF FUNDAMENTALS OF NEUTRON POROSITY INTERPRETATION: AMERICIUM-BERYLLIUM SOURCE VERSUS NEUTRON GENERATOR-BASED ALTERNATIVES Ahmed Badruzzaman, Pacific Consultants and Engineers Andrea Schmidt, Lawrence Livermore National...

... the results of the triaxial resistivity tool. Finally, the density/neutron results were used for a Thomas/Stieber shaly sand interpretation with the end points calibrated to the NMR and image results. The traditional interpretation using density/neutron porosity with dual water saturation provided a net pay...

... accomplished for decades using a combination of neutron logging tools with different neutron sources and a variety of gamma-ray detector materials. The primary measurements of these tools are: Sigma Thermal Neutron porosity (TPHI), Carbon-Oxygen ratio (C/O) and Gamma Ray Spectroscopy. A multimineral...

...-ray (GR) response is mainly affected by matrix, and electrical resistivity is determined by the pore volume of conductive formation water. Cross-over of bulk density and SPWLA 56th Annual Logging Symposium, July 18-22, 2015 2 neutron porosity can indicate the existence of hydrocarbon components...

... temperatures up to 175 C. The tool introduces a stand-alone fast neutron measurement that is independent of neutron porosity and sigma formation properties but is highly sensitive to variations in gas volume while insensitive to variations in water volume. Additionally, the tool provides high-resolution...

... detector gamma ray SNGD reservoir log analysis Griffith neutron porosity Symposium spwla 54 well logging chemical source evaluation Density correction Upstream Oil & Gas bed boundary effect formation density ADCO acquisition carbonate reservoir Abstract A new...

... saturations around the immediate region as injection gas traversed the reservoir. During each injection phase (gas/water/gas/water), formation resistivity, neutron porosity and temperature were regularly monitored in order to develop an interpretation model that would give a complete and quantitative record...