Rare sulphate of nickel, retgersite, was identified on the one specimen collected dump Lill shaft, Březové Hory ore district, Příbram (Czech Republic) in 1990s. The consists quartz gangue with dominant millerite and sphalerite. Retgersite forms light blue to blue-green curved fibrous microcrystalline aggregates up 2 mm size vitreous lustre, growing surface small outer vugs supergene altered gan...

This paper begins with presenting a mathematical model for contaminant transport in the fractured vuggy porous media of a species of contaminant PCP . Two phases are numerically simulated for a process of contaminant and clean water infiltrated in the fractured vuggy porous media by coupling mixed finite element MFE method and finite volume method FVM , both of which are locally conservative, t...

Diversas feições de carste em arenito ocorrem nos afloramentos da Formação Cabeças (Arenitos Devonianos) na borda leste Bacia do Parnaíba no Nordeste brasileiro. Nesse trabalho, será enfocado os aspectos genéticos para a formação município Castelo Piauí. A área é formada por superfícies erosivas pontilhadas residuais tipo ruiniformes que se distribuem forma platôs seccionados galerias multidire...

The Zagros Fold and Thrust belt is one of the world's most prolific petroleum provinces. Most hydrocarbon reserves are stored in naturally fractured reservoirs such fracture systems can therefore have a significant impact on reservoir performance. Fractures important paths for fluid flow carbonate reservoirs. Fracture data were collected outcrops Kirkuk Group Oligocene age around Qara Chauq Sou...

We develop a finite element discretization and multigrid solver for a Darcy-Stokes system of three dimensional vuggy porous media, i.e., porous media with cavities. The finite element method uses low order mixed finite elements in the Darcy and Stokes domains, and special transition elements near the Darcy-Stokes interface to allow for tangential discontinuities implied by the Beavers-Joseph bo...

Thermochemical sulfate reduction (TSR) commonly occurred in the dolostone reservoirs of Upper Permian Changxing Formation (P3c) Yuanba (YB) gas field, Sichuan Basin, yet controversy remains regarding source required for TSR. To trace sulfate, sulfur and strontium isotopic compositions were measured three diagenetic celestite (SrSO4) samples found P3c YB field. In addition, Carbonate-associated ...

Yarimburgaz is a double cave with slightly offset upper and lower entrance chambers, connected laterally inside the cave. Below Byzantine and modern debris, the upper cave encloses Chalcolithic to Upper Paleolithic occupations above a beach sand attributed to the Last Interglacial. Below the beach sand, strongly modified sediments contain sparse Lower Paleolithic artifacts. The lower cave prese...

This article presents a method for simulation of continuous and discrete fracture parameters distributions in hydrocarbon reservoirs using Sequential Indicator Simulation (SIS) and Sequential Gaussian Simulation (SGS) methods. Fracture parameters including azimuth, dip and density are integrated with the porosity and permeability values determined in the models. Based on this study we have iden...

Flow in both saturated and non-saturated vuggy porous media, i.e. soil, is inherently multiscale. The complex microporous structure of the soil aggregates and the wider vugs provides a multitude of flow pathways and has received significant attention from the X-ray computed tomography (CT) community with a constant drive to image at higher resolution. Using multiscale homogenization, we derive ...

A new locality of böhmite and zeolite minerals, called „Soutěsky above the quarry“, occurs near quarry „Soutěsky“ on SW slope Hlídka hill, eastward Soutěsky village, about 5 km od town Děčín (Czech Republic). The mineralization is bound to vugs Cenozoic volcanics. Böhmite forms mostly whitish brownish hemispherical spherical clusters up mm in size. unit-cell parameters böhmite, refined from X-r...