... characterization halite artificial intelligence sequence upstream oil & gas reservoir geomechanics lithology drilling operation machine learning application sediment inclination morphology anhydrite knowledge santos basin algorithm figure 6 solubility frequency incidence chaos indicator...

... extensometers installed at the basement indicated that the heave displacement was associated with the expansion of the four upper meters of the foundation material. Mineralogical investigation by means of X-ray diffraction analysis identified anhydrite and gypsum in samples recovered from boreholes...

... of sulphates is a process that involves flow of water and dissolution of anhydrite. Once solutions exceed the saturation limit, gypsum precipitates and crystallizes in the rock mass. This leads to heave and swelling pressures on structures but also on pressures within the rock mass around the underground...

... as the tunnel approached completion. No indications of the presence of anhydrite and dissolved sulphates were known prior to tunnelling. Water samples had been taken from the beginning of construction and the concentration of anions and cat ions determined. Sulfate content was substantial, in one well...

... hydrostatic pressures behind shaft liners in the longer term; and the development of potentially significant swelling pressures behind shaft liners in some anhydritic shales and marls when water is introduced to these formations. The approach adopted in designing the lining of a 7m finished diameter vertical...

... rather than bedded salt formations as host rocks, while in China, salt domes suitable for energy storage have been hardly found so far. Bedded salt rocks are usually composed of many thin salt layers and non-salt sedimentary interlayers (e.g. anhydrite, shale, dolomite, glauberite, etc.) (Li et al. 2007a...

.... On account of the geo-mechanical behavior of the main anhydrite which is different from that of rock salt, an in-situ test for this formation is also to be carried out. Subject: Underground storage of petroleum, gas and nuclear waste disposal Keywords: nuclear repository, case studies, field measurements...

... crystals explains the severe swelling occurred in some tunnels crossing sulphate for- mations. The presence of groundwater and discontinuities, and the proportions of anhydrite and gypsum within the claystone rock mass play an important role for the development of swelling in tunnels. Evaporation...

... of this phenomenon. To quantify the compaction, the lithology across the failure depth (3200 m for well M-42, as the first failed well) was reviewed and an interface between anhydrite (as a stiff rock) and marl (as a soft rock) was detected. To obtain static elastic parameters of the host rock, uniaxial compressive...

... of deficiencies, which may lead to inaccurate estimates of swelling potential. Another problem is that up until now we have not had a generally accepted constitutive relationship for the swelling process of anhydritic rock. Due to this uncertainty, it is often impossible to develop safe and economic designs...

... ABSTRACT A three dimensional constitutive law for swelling rock is presented. It can be applied to the osmotic swelling of mudstone as well as to the swelling of rocks containing anhydrite. It describes the development of time-dependent strains and stresses due to swelling considering elastic...

... of overburden (presence and thickness of salt layer in exploitation roof, presence of clayey rocks or hard rocks e.g. dolomite or anhydrite), presence of water-bearing strata and possibly natural brine levels, discontinuities, etc. are discussed. In the second part, the main features of mechanical behaviour...

..., President of the ISRM for his kind words of introduction. hydraulic fracturing reservoir geomechanics Upstream Oil & Gas Einstein Artificial Intelligence underpressure resistance Coalescence Aristorena anhydrite mit geometric-mechanical model crack propagation mechanism Switzerland...

... ABSTRACT: Rock salt and anhydrite - the main constituents of the salt deposits - exhibit very different mechanical behaviour. If cavities are mined in the ductile rock salt near the stiff anhydrite layers, convergence of the cavities can result in high deviatoric stress levels and in micro...

... Upstream Oil & Gas field data Swallow Gypsum Room shear strength Reservoir Characterization displacement Rock mechanics pillar exploitation construction materials outcrop anhydrite rock mass means stress drop rockburst pillar - .Back-analysis of a rockburst in a swallow gypsum room...

... behaviour of anhydritic rocks, free swelling and swelling pressure tests were performed on specimens taken from different orientations relative to the bedding plane. Prior the test the anhydrite content was 65%. By the end of the free swelling strain test after 1 year 21–78% of anhydrite was transformed...

... swelling stress of the "anhydrite swelling", drillings, laboratory measurements of swelling strain and stress, petrographical and mineralogical investigations. The conversion of anhydrite into gypsum in the anhydrite containing shale is of special interest. ZUSAMMENFASSUNG: Ernsthafte Probleme mit...

...Horizontal stresses in anhydriceous rock HOhel-iOrizontalspannungen im Anhydritgebirge La contrainte horizontale dans des roches a~hydres L.WICHTER, Otto-Graf-Institut, Stuttgart, Germany ABSTRACT: Anhydriceous sedimentary rocks start swelling when water has .access to them. The anhydrite...

... drilling fluid management & disposal gonflement axial strain Reservoir Characterization Upstream Oil & Gas potentiel drilling fluids and materials swell test gypsum schweiz mineral specimen anhydrite clay fraction texture mineralogy clay-sulfate rock Madsen structural...

... between the relieved stress and the obtained swelling heave, also was used successfully for gypaum Keuper which contains swell- ing clay minerals as well ss anhydrite. The full re- versibility of the swell strains and stresses is not vslid in this csse. However, the action of the "physical" swelling...