Pre-Stack Inversion to Seismic Rock Type Predictability (SRT) Case Study: Gabus Zone 3B in Belanak Field

2018 ◽  
Author(s):  
B. A. Kurniawan
Keyword(s):  
Rock Type

scholarly journals The colour analysis method applied to homogeneous rocks

Geologos ◽  
2015 ◽  
Vol 21 (4) ◽  
pp. 233-239
Author(s):  
Amadé Halász ◽  
Ákos Halmai
Keyword(s):  
Radioactive Waste ◽  
Rock Type ◽  
Cost Effective ◽  
Analysis Method ◽  
The Core ◽  
Cost Effective Method ◽  
Natural Gamma ◽  
Computer Aided ◽  
High Level

Abstract Computer-aided colour analysis can facilitate cyclostratigraphic studies. Here we report on a case study involving the development of a digital colour analysis method for examination of the Boda Claystone Formation which is the most suitable in Hungary for the disposal of high-level radioactive waste. Rock type colours are reddish brown or brownish red, or any shade between brown and red. The method presented here could be used to differentiate similar colours and to identify gradual transitions between these; the latter are of great importance in a cyclostratigraphic analysis of the succession. Geophysical well-logging has demonstrated the existence of characteristic cyclic units, as detected by colour and natural gamma. Based on our research, colour, natural gamma and lithology correlate well. For core Ib-4, these features reveal the presence of orderly cycles with thicknesses of roughly 0.64 to 13 metres. Once the core has been scanned, this is a time- and cost-effective method.

EXPLORING LINKAGES BETWEEN SUBCRITICAL CRACK GROWTH AND ROCK TYPE DEPENDENT EROSION RESISTANCE, A CASE STUDY FROM THE BLUE RIDGE, VA

2016 ◽  
Author(s):  
Martha Cary Eppes ◽  
◽  
Gregory S. Hancock ◽  
Faye L. Moser ◽  
Benjamin Weiserbs ◽  
...  
Keyword(s):  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Erosion Resistance ◽  
Rock Type ◽  
Blue Ridge

Integration of geophysics and petrography for identifying the aquifer and the rock type: A case study from Giddalur, Andhra Pradesh, India

2020 ◽  
Vol 129 (1) ◽  
Author(s):  
Taufique Warsi ◽  
V Satish Kumar ◽  
Dewashish Kumar ◽  
M J Nandan ◽  
George Biswas ◽  
...  
Keyword(s):  
Andhra Pradesh ◽  
Rock Type ◽  
Type A

scholarly journals The origin of ‘tauw’, an enigmatic building stone of the Mergelland: a case study of the Hesbaye region, southwest of Maastricht (Belgium)

2011 ◽  
Vol 90 (2-3) ◽  
pp. 239-258 ◽  
Author(s):  
M. Dusar ◽  
R. Dreesen ◽  
L. Indeherberge ◽  
E. Defour ◽  
R. Meuris
Keyword(s):  
Small Area ◽  
Rock Type ◽  
Building Stone ◽  
Natural Occurrence ◽  
Natural Setting ◽  
Building Stones ◽  
The Rich ◽  
Diagenetic History ◽  
Lithostratigraphic Correlation

AbstractThe origin of a peculiar type of silicified limestone with nodular flints used in parish churches at Sluizen and Vreren, south of Tongeren (province of Limburg, Belgium), has now been elucidated by the discovery of the same rock type in its natural setting, namely the silicified top of the Cretaceous which underlies Clay-with-flints (‘flint eluvium’) and Oligocene sands in a disused quarry at Elst, municipality of Riemst (Limburg, Belgium). Co-operation between professional geologists and amateur palaeontologists has allowed to characterise this rock type, here referred to as ‘Elst tauw’, both petrographically and palaeontologically. The rich echinoid fauna has also been assessed, on the basis of a comparison with assemblages from the Clay-with-flints at Halembaye (Haccourt/Lixhe, province of Liège, Belgium) and at Zichen-Eben Emael in the Hesbaye region. P.J. Felder's ecozones, based on bioclast assemblages, substantiated by analyses of petrographical biofacies features of the original calcarenite, has allowed lithostratigraphic correlation of the ‘Elst tauw’ with the ‘Roosburg block’, which is a variety of ‘Maastricht stone’. Both methods indicate that the ‘Elst tauw’ developed in beds that can be assigned to the condensed Valkenburg-Schiepersberg interval of the lower Maastricht Formation. Petrographical analysis has shown the ‘Elst tauw’ to be quite distinctive; in addition, its natural occurrence at the Elst quarry matches the building stone records in rock type. The latter stem from the same small area, situated southwest of Maastricht. The major steps in its diagenetic history could be reconstructed, starting with pervasive pyritisation of the calcareous allochems, followed by silicification of the grains and pore spaces (different silica cements that became partially recrystallised), completed by oxidation of pyrite with transformation into limonite and, finally, dissolution of the non-pyritised or partially pyritised skeletal allochems creating a mouldic porosity. Silicification probably was achieved prior to the Oligocene. This particular mode of formation has generated a discussion on the proper use of the vernacular term ‘tauw’, a term used in a different sense by the industry, stratigraphers and students of building stones.

Assessing of tight reservoir by combining the porosity of geological units, and simulated images of rock types: A case study

2021 ◽  
Author(s):  
Lamia Boussa ◽  
Amar Boudella ◽  
José Almeida
Keyword(s):  
Stochastic Simulation ◽  
3D Model ◽  
Reservoir Characterization ◽  
Rock Type ◽  
Sequential Gaussian Simulation ◽  
Geostatistical Methods ◽  
Rock Types ◽  
Gaussian Simulation ◽  
The Impact

<p>Reservoir characterization and flow studies require accurate inputs of petrophysical properties such as porosity, permeability, water and residual oil saturation and capillary pressure functions. All these parameters are necessary to evaluate, predict and optimize the production of a reservoir.</p><p>This study is the continuity of a previous work that summarize the construction of a net rock aerial map by combining stochastic simulation of rock types and processed seismic data. In this case study; petrophysical data are integrated to construct a 3D model of porosity corresponding to the 3D model of rock type. This is in order to further understand the intricacies of the geostatistical methods used and the impact of the technique on the resulting uncertainty profile</p><p>For the construction of 3D model of porosity corresponding to the 3D model of rock types, a geostatistical workflow encompassing the modelling of experimental variograms and sequential Gaussian simulation (SGS) were used. The geostatsitical methodologies of stochastic simulation such as SGS enabled the generation of several realistic scenarios of constinuous data, such as porosity, within a volume, thus facilitating the association of local probabilities of occurrence of each rock type.</p><p>The resulting porosity image properly combines the available seismic and well data and balance the local and regional uncertainty of the studied reservoir volume.</p><p><strong>Keywords: </strong>Geostatistics, Sequential Gaussian Simulation (SGS), Rock types, Porosity, Uncertainty, Spatial resolution.</p>

Multimedia exploration strategies for PGEs: insights from the Surficial Geochemistry Case Studies Project, Lake Nipigon Region Geoscience Initiative, northwestern Ontario

2007 ◽  
Vol 44 (8) ◽  
pp. 1169-1202 ◽  
Author(s):  
Richard D Dyer ◽  
Peter J Barnett
Keyword(s):  
Case Studies ◽  
Lake Sediment ◽  
Rock Type ◽  
Stream Water ◽  
Stream Sediment ◽  
Ultramafic Rocks ◽  
High Background ◽  
Pge Mineralization ◽  
Lac Des Iles

The Surficial Geochemistry Case Studies Project in the Lake Nipigon region involved detailed Quaternary mapping and multimedia geochemical sampling within five case study areas. Two of these areas, Lac des Iles and Tib Lake, contain known platinum group element (PGE) mineralization. The other three case study areas feature drainage catchments with lakes that contain anomalous levels of PGEs in bottom sediment. Surficial media sampled included till, soils, stream sediment, lake sediment, peat, surface water, and groundwater. Over Archean terrain, such as at Lac des Iles and Tib Lake, there is excellent geochemical contrast between the PGE prospective rock type (mafic to ultramafic intrusive) and the surrounding rock type (e.g., granitoid rocks). This geochemical contrast is mirrored in the geochemistry of most surficial media sampled during this project. Over the Nipigon Embayment, the geochemical contrast between mafic and ultramafic rocks (e.g., “Seagull”-type intrusions) and the surrounding diabase sill rocks is inherently weaker due to the relatively high background levels for copper, palladium, and gold in the Nipigon diabase sills. However, the results of stream-water geochemistry over the Seagull and Disraeli ultramafic intrusions highlight their unique geochemical footprint on the surficial landscape, in particular with respect to Cr, Mg, and Ni, compared with the surrounding Nipigon diabase. In addition, lake sediments underlain by the Seagull, Disraeli, and Hele intrusions have distinctly elevated Cr concentrations and Gd/Yb ratios compared with the surrounding areas underlain by Nipigon diabase sills or Sibley Group rocks. Therefore, exploration value can be maximized over the Nipigon Embayment by exploiting these geochemical contrasts in surficial media to discriminate between ultramafic rocks and the surrounding Nipigon diabase sills. The results of this study highlight the importance of chromium concentrations in surficial media as a diagnostic feature for the presence of ultramafic rocks, regardless of their age or location. In general, a cost-effective exploration strategy for PGE mineralization includes targeting the associated metals (Cr, Ni) within drift deposits (C-horizon till) and drainage media (stream sediment, lake sediment) to vector to prospective mafic–ultramafic intrusive rocks, prior to detailed (property scale) follow-up, involving the determination of base metals and PGEs within soil, till, stream sediment, and peat samples. Relative to the metals copper, nickel, and chromium (ppm levels), the PGEs have significantly lower initial concentrations (ppb levels), are less mobile in the surficial environment, have significantly shorter glacial dispersion trains, and are less reliably determined at the laboratory.

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