Reservoir model needs to be constrained by various data, including dynamic production data. Reservoir heterogeneities are usually described using geostatistical approaches. Constraining geologicaljgeostatistical mode! realizations by dynamic data is generally performed through history matching, which is a complex inversion process and requires a parameterization of the geostatistical realizatio...

Being able to provide a quick and accurate pollutant maps from readings at isolated measurement stations is becoming more important today in light of the European norms on air quality and the public’s demand to be informed. Commonly used algorithms for cartography are quick but their accuracy remains to be determined. Firstly, the choice of method is arbitrary and based on user's subjective per...

This paper presents an overview of geostatistical simulation with particular focus on aspects of importance to its application for quantification of risk in the mining industry. Geostatistical simulation is a spatial extension of the concept of Monte Carlo simulation. In addition to reproducing the data histogram, geostatistical simulations also honour the spatial variability of data, usually c...

The spatial variability in the concentrations of 1,2,3,4,5,6-hexachlorocyclohexane (HCH) and 1,1,1-trichloro-2,2-bis-(p-chlorophenyl) ethane (DDT) in surface soils was studied on the basis of the analysis of 131 soil samples collected from the surface layer (0-20 cm depth) of the alluvial region of Beijing, China. The concentrations of total HCHs (including alpha-, beta-, gamma-, and delta-isom...

In order to further research on the polluting condition and spreading features of heavy metals in urban surface soil, this study makes statistical analysis on indexes of 8 heavy metal concentrations. Then Are GIS geostatistical analyst was used for Kriging interpolation of each kind of heavy metal concentration before figuring out the spatial distribution. Firstly, heavy metal contamination was...

Robust low-cost sampler systems allowing for monitoring of air pollutants important for air quality resulting from forest fires and urban/agricultural activities in remote locations were tested and developed. The main emphasis was placed on passive samplers for ozone and nitrogenous pollutants (nitrogen oxides, ammonia and nitric acid vapor). In addition, a system for evaluation of total inputs...

The paper investigates strategic interactions between an independent analyst and an a¢ liated analyst when the analysts’information acquisition and the timing of their recommendations are endogenous. Compared to the independent analyst, the a¢ liated analyst has superior information but faces a con‡ict of interest. I show that the independent analyst’s recommendation, albeit endogenously less i...

This paper describes one solution to the problem of constraining geostatistical models by well-test results which has been obtained within the frame of the HELIOS research project conduced by Elf and IFP in the field of reservoir engineering. To do so, a numerical simulation program devoted to the simulation of well-tests has been coupled with a nonlinear constrained optimization program to mak...

Elfriede Dustin currently works as a test manager at BNA Software (www.bnasoftware.com) in Washington, DC. She is a SQA Certified test engineer and has supported test efforts for a multitude of applications. In support of software test efforts, Elfriede has been responsible for implementing automated test, or has performed as the lead consultant guiding the implementation of automated software ...