... the interaction, the total and accessible porosities are 1.6% and 0.6%, respectively, as characterized by the Small Angle Neutron Scattering (SANS) technique. SANS results show that the total porosity of the carbonate caprock increases apparently due to rock-brine-CO 2 interaction and the increasing rate rises...

... detector well logging borehole environment neutron inelastic ratio correction log analysis porosity log ratio-to-porosity transform salinity compensation compensate borehole condition sensitivity borehole salinity effective borehole density new cased-hole porosity measurement...

... with the shear horizontal (SH) mode. Additionally, a multipole acoustic tool was utilized to analyze the response of both the refracted modes, compressional and shear, and the guided modes, casing tube and flexural waves. Nuclear services employed pulsed neutron and compensated neutron techniques. The SMP...

... the reference unit in the reference wells, and a regression-based optimization algorithm is used to solve for constant shifts which are applied as normalization corrections for density and neutron logs in the remaining wells. The process of selecting reference wells and picking the boundaries...

..., chlorine, hydrogen, iron, magnesium, oxygen, potassium, silicon, sulfur, thorium, titanium, and uranium. These elements are utilized to identify the minerals present in both conventional and unconventional formations. Tool operation begins by emitting high energy 14 MeV neutrons into the formation from...

... Abstract Sigma logging is a proven method for determining oil/water saturation behind casing. In this paper, we present a new, diffusion-corrected, sigma algorithm for a four-detector pulsed-neutron logging tool. Since the diffusion effect is inversely related to the distance between source...

... (Gd 2 O 3 ) which has a high thermal neutron capture cross section. As a result, the presence of engineered proppant can significantly affect MPDN measurements. The affected nuclear attributes include borehole sigma, neutron induced gamma ray counts, burst ratio and elemental yield, particularly...

... Abstract Estimation of total porosity from neutron and density porosity logs in organic shale (source rock) is challenging because these logs are substantially affected by fluid and matrix-composition effects. Conventional interpretation of neutron and density porosity logs often includes...

... on experimental data taken in a controlled environment and on very precise modeling results to characterize different environmental effects. All these results have been validated through more than 60 direct job comparisons, in which GGD and SNGD were available from the same tool. Sourceless Neutron-Gamma...

... Abstract Chemical radioactive sources are commonly deployed in logging-while-drilling (LWD) assemblies to measure formation bulk density and neutron porosity. These measurements are widely used in porosity evaluation, lithology determination, clay volume estimates and fluid identification...

... Abstract Carbon Dioxide (CO 2 ) sequestration and enhanced recovery projects require the evaluation of rocks containing mixtures of CO 2 , water, and gaseous or liquid hydrocarbons. Pulsed neutron logs of various designs and measurement types have been used since the 1960s to evaluate...

... well logging borehole neutron Upstream Oil & Gas spe 123992 log analysis Monte Carlo Modeling Weight Fraction fraction elemental weight fraction GEM tool interpretation pressure housing thermal neutron shield spectra magnesium gamma ray aluminum mineral Abstract...

... Cesium is a dense, high-atomic number element with a large thermal neutron absorption cross section. In the case of high concentration of cesium in CsK formate fluids, the fluids have a very high P e (P e =199 for 2.09-g/cm 3 CsK formate), a low hydrogen index (HI=0.545 for 2.09-g/cm 3 CsK...

... Gamma Ray Spectroscopy neutron evaluation Upstream Oil & Gas inelastic spectra mineralogy well logging inelastic spectrum instrument log analysis concentration sandstone carbonate matrix spectrum spectra Trans lithology structural geology symposium reservoir...

... and a means to correct the neutron porosity for clay and matrix effects. By comparing irreducible water volume to bulk volume hydrocarbon, an accurate prediction of water production can be determined. Oil and gas bearing intervals can be easily identified from crossover of the matrix corrected neutron...

... well logging lithology saudi arabia neutron deviation software procedure cross plot database petrophysical model correction reference point core data qc check asia government reservoir drilling operation structural geology log analysis density society saudi arabia government phase...

... and matrix properties is a significant advance over values determined from conventional techniques. Consequently, it is much easier to directly apply scientific conductivity and permeability models for petrophysical evaluation. petrophysical evaluation total porosity real time system neutron...

... a timing sequence identical to the Dual-Burst TDT tool, with a short neutron burst followed by a longer burst. It produces thermal decay-time distributions optimized for the determination of both borehole and formation capture cross sections with low statistical variations. Time-decay data, burst-off...

... and develop corrections for log and core measurements. This study would benefit the worldwide users of SBM drilling fluids. This paper will discuss the observations and propose a program to better understand the phenomenon and improve formation evaluation accuracy. well logging log analysis neutron...

... The applications of pulsed-neutron measurements for formation evaluation are well established. Pulsed-neutron wireline tools are used to determine water saturation, neutron porosity and formation mineralogy in both open and cased holes. In addition to the rich variety of measurements...