Interval inversion of borehole data for petrophysical characterization of complex reservoirs

2012 ◽  
Vol 47 (2) ◽  
pp. 172-184 ◽  
Author(s):  
M. Dobróka ◽  
N. Szabó ◽  
E. Turai
Keyword(s):  
Borehole Data ◽  
Interval Inversion

Three different approaches to provide urban geological information from a geological survey perspective: the Catalan case study

2020 ◽  
Author(s):  
Guillem Subiela ◽  
Miquel Vilà ◽  
Roser Pi ◽  
Elena Sánchez
Keyword(s):  
Urban Areas ◽  
Geological Survey ◽  
Anthropogenic Activity ◽  
Geological Environment ◽  
Borehole Data ◽  
Geological Information ◽  
Geological Factors ◽  
Geological Map ◽  
The Government

<p>Studying urban geology is a key way to identify municipal issues involved with urban development and sustainability, land resources and hazard awareness in highly populated areas. In the last decade, one of the lines of work of the Catalan Geological Survey (Institut Cartogràfic i Geològic de Catalunya) has been the development of (i) 1:5.000 scale Urban Geological Map of Catalonia project. Besides, two pilot projects have recently been started: (ii) the system of layers of geological information and (iii) the fundamental geological guides of municipalities. This communication focuses on the presentation of these projects and their utility, with the aim of finding effective ways of transferring geological knowledge and information of a territory, from a geological survey perspective.</p><p>The 1:5.000 urban geological maps of Catalonia (i) have been a great ambitious project focused on providing detailed, consistent and accurate geological, geotechnical and anthropogenic activity information of the main urban areas of Catalonia. Nevertheless, it must be taken into account that the compilation and elaboration of a large volume of geological information and also the high level of detail require a lot of time for data completeness.</p><p>In order to optimize a greater distribution of information, a system of layers of geological information (ii) covering urban areas is being developed. This pilot project consists of providing specific layers of Bedrock materials, Quaternary deposits, anthropogenic grounds, structural measures, geochemical compositions, borehole data and so on. However, as information layers are treated individually, it may not be clear the coherence between data from different layers of information and its use is currently limited to Earth-science professionals working with geological data.</p><p>Hence, as a strategy to reach a wider range of users and also provide a homogeneous and varied geological information, the development of fundamental geological guides for municipalities is also being carried out (iii). These documents include the general geological characterization of the municipality, the description of the main geological factors (related to geotechnical properties, hydrogeology, environmental concerns and geological hazards and resources) and the list of the sources of geological information to be considered. Moreover, each guide contains a 1:50.000 geological map that has cartographic continuity with the neighbouring municipalities. The municipal guides allow a synthesis of the geological environment of the different Catalan municipalities and give fundamental recommendations for the characterization of the geological environment of the municipality.</p><p>In conclusion, the three projects facilitate the characterization of geological environment of urban areas, the evaluation of geological factors in ground studies and also, in general, the management of the environment. These products differ depending on the degree of detail, the coherence of the geological information, the necessary knowledge for their execution or their purpose of use. This set of projects defines a geological urban framework, which is adjusted depending on the government’s requirements, the society’s needs and the geological survey’s available resources.</p>

scholarly journals Geological and geophysical characterization of the southeastern side of the High Agri Valley (southern Apennines, Italy)

2015 ◽  
Vol 15 (2) ◽  
pp. 315-323 ◽  
Author(s):  
A. Giocoli ◽  
T. A. Stabile ◽  
I. Adurno ◽  
A. Perrone ◽  
M. R. Gallipoli ◽  
...  
Keyword(s):  
Multidisciplinary Approach ◽  
National Research Council ◽  
Joint Analysis ◽  
Borehole Data ◽  
Aerial Photos ◽  
Basilicata Region ◽  
Geophysical Surveys ◽  
Active Landslide

Abstract. In the frame of a national project funded by Eni S.p.A. and developed by three institutes of the National Research Council (the Institute of Methodologies for Environmental Analysis, the Institute of Research for Hydrogeological Protection and the Institute for Electromagnetic Sensing of the Environment), a multidisciplinary approach based on the integration of satellite, aero-photogrammetric and in situ geophysical techniques was applied to investigate an area located in the Montemurro territory in the southeastern sector of the High Agri Valley (Basilicata Region, southern Italy). This paper reports the results obtained by the joint analysis of in situ geophysical surveys, aerial photos interpretation, morphotectonic investigation, geological field survey and borehole data. The joint analysis of different data allowed us (1) to show the shallow geological and structural setting, (2) to detect the geometry of the different lithological units and their mechanical and dynamical properties, (3) to image a previously unmapped fault beneath suspected scarps/warps and (4) to characterize the geometry of an active landslide affecting the study area.

scholarly journals Determination of liquefaction potential for two selected sites in Kerbala city- middle of Iraq

2017 ◽  
Vol 7 (1) ◽  
pp. 25
Author(s):  
Hamed Abdullah ◽  
Mohammed Fattah ◽  
Abdulkareem Abed
Keyword(s):  
Relative Density ◽  
Size Distribution ◽  
Ground Surface ◽  
Borehole Data ◽  
Ground Acceleration ◽  
Geotechnical Characterization ◽  
Sand Deposit ◽  
Different Sources

Geotechnical characterization of the sites has been investigated with the collection of borehole data from different sources. Using the data, grain size distribution curves have been developed to understand the particle size distribution of the alluvium present. These curves were further used for preliminary assessment of liquefiable areas. From geotechnical characterization, it has been observed that the soil profile in the two sites is dominated by sand and silty sand.Seed and Idriss (1971) approachhas been usedevaluatethe liquefaction potentialbydeterminationof the relation between the maximum ground acceleration (a max/g) valuesdue to an earthquake and the relative density of a sand deposit in the field. The results reveal that the study area will be subjected to occurrence of liquefaction under an earthquake of maximum ground acceleration of 0.1 g when the soil is loose with a relative density between (25-40) % in Kerbala city.Design chartswere obtained for determination of liquefaction potentialin any layer with knowingthe field relative densityand the value of the maximum ground surface acceleration.

Characterization of a fractured granite using radio magnetotelluric (RMT) data

Geophysics ◽  
2004 ◽  
Vol 69 (5) ◽  
pp. 1155-1165 ◽  
Author(s):  
Niklas Linde ◽  
Laust B. Pedersen
Keyword(s):  
Forward Modeling ◽  
Three Dimensions ◽  
Small Island ◽  
Fracture Zones ◽  
Borehole Data ◽  
Weathered Layer ◽  
3D Effects ◽  
Displacement Currents ◽  
3D Forward Modeling

We applied tensor radio magnetotellurics (RMT) in the 10–250 kHz frequency range to study major fracture zones on Ävrö, a small island (1.6 × 1.2 km2) in southeastern Sweden with bedrock dominated by highly resistive granite. The interpretation of a 950‐m RMT profile was facilitated by seismic reflection and borehole data but was complicated (1) by possible 3D effects of the surrounding sea and (2) because the quasi‐static assumption is violated. Inversions based on the quasi‐static assumption give severely distorted models in this type of environment. Inversion codes that include displacement currents are restricted to 1D structures. Therefore, 2D inversions were applied to lower frequencies only. The central part of the inverted profile showed a 30–40‐m‐thick weathered layer over an almost intact bedrock down to a depth of at least 200 m, where higher salinity and/or fracturing yielded higher conductivities. The first 200 m of the profile revealed a major fracture zone, which coincided with a seismic reflector. We used 3D forward modeling to understand the sea effect and to model the conductor in three dimensions. We believe that 3D forward modeling is a highly valuable tool to distinguish known 3D effects (i.e., the sea) from regional 2D features of interest. We suggest that water flow at Ävrö is dominated by a few major fracture zones.

Sign in / Sign up

Export Citation Format

Share Document