ExxonMobil

About: ExxonMobil is a company organization based out in Irving, Texas, United States. It is known for research contribution in the topics: Catalysis & Polymerization. The organization has 16969 authors who have published 23758 publications receiving 535713 citations. The organization is also known as: Exxon Mobil Corporation & Exxon Mobil Corp..

Method For Geophysical and Geological Interpretation of Seismic Volumes In The Domains of Depth, Time, and Age

Abstract: Method for transforming geologic data relating to a subsurface region between a geophysical depth domain and a geologic age domain. A set of topologically consistent surfaces ( 252 a ) is obtained that correspond to seismic data ( 252 ). The surfaces are enumerated in the depth domain. An age is assigned to each surface in the depth domain ( 255 ). The age corresponds to an estimated time of deposition of the respective surface. An age mapping volume is generated ( 256 ). An extent of the age domain is chosen. A depth mapping volume is generated ( 260 ). Both the age mapping volume and the depth mapping volume are used to transform geophysical, geologic, or engineering data or interpretations ( 258, 263 ) between the depth domain and the age domain ( 268 ) and vice versa ( 269 ). The geophysical, geologic, or engineering data or interpretations transformed by at least one of the age or depth mapping volume are outputted.

Crystal Structure of Zeolite MCM-68: A New Three-Dimensional Framework with Large Pores

Abstract: The crystal structure of the aluminosilicate MCM-68 was solved from synchrotron powder diffraction data by the program FOCUS. The unit cell framework contains Si100.6Al11.4O224. This material cryst...

Critical Properties of an Elastic Fractal

Abstract: Some solvable fractal models of the percolating backbone are used to investigate the critical behavior of a random, $d$-dimensional, isotropic, elastic medium. The critical exponent $T$ for the elastic moduli is found to be appreciably greater than the conductivity exponent $t$, and the ratio of bulk to shear modulus is found to have the universal value $\frac{4}{d}$. A comparison with the effective-medium and the Clausius-Mossotti-type approximations leads to the conjecture that the result $\frac{4}{d}$ is in fact exact.

Practical considerations in the application of simulated annealing to stochastic simulation

Abstract: Realizations generated by conditional simulation techniques must honor as much data as possible to be reliable numerical models of the attribute under study. The application of optimization methods such as simulated annealing to stochastic simulation has the potential to honor more data than conventional geostatistical simulation techniques. The essential feature of this approach is the formulation of stochastic imaging as an optimization problem with some specified objective function. The data to be honored by the stochastic images are coded as components in a global objective function. This paper describes the basic algorithm and then addresses a number of practical questions: (1) what are the criteria for adding a component to the global objective function? (2) what perturbation mechanism should be employed in the annealing simulation? (3) when should the temperature be lowered in the annealing procedure? (4) how are edge/border nodes handled? (5) how are local conditioning data handled? and (6) how are multiple components weighted in the global objective function?

GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1: reproducibility of results for the international intercomparison

Abstract: One of the key activities during the initial phase of the international GEOTRACES program was an extensive international intercalibration effort, to ensure that results for a range of trace elements and isotopes (TEIs) from different cruises and from different laboratories can be compared in a meaningful way. Here we present the results from the intercalibration efforts on neodymium isotopes and rare earth elements in seawater and marine particles. Fifteen different laboratories reported results for dissolved 143Nd/144Nd ratios in seawater at three different locations (BATS 15 m, BATS 2000 m, SAFe 3000 m), with an overall agreement within 47 to 57 ppm (2σ standard deviation of the mean). A similar agreement was found for analyses of an unknown pure Nd standard solution carried out by 13 laboratories (56 ppm), indicating that mass spectrometry is the main variable in achieving accurate and precise Nd isotope ratios. Overall, this result is very satisfactory, as the achieved precision is a factor of 40 better than the range of Nd isotopic compositions observed in the global ocean. Intercalibration for dissolved rare earth element concentrations (REEs) by six laboratories for two water depths at BATS yielded a reproducibility of 15% or better for all REE except Ce, which seems to be the most blank-sensitive REE. Neodymium concentrations from 12 laboratories show an agreement within 9%, reflecting the best currently possible reproducibility. Results for Nd isotopic compositions and REE concentrations on marine particles are inconclusive, and should be revisited in the future.