Search

This study consists of an innovative multi-disciplinary approach (combining borehole imagery, core data, 3D seismic and field production) which aims at better characterizing and representing karstic features in a dual porosity/permeability simulation model and improving the associated reservoir model predictions in the context of a carbonated reservoir characterization. The applied methodology can be described as follow: Identification and picking of karstification features on bore-hole imagery (GeologTM software) Deterministic picking of karstic features as geobodies on the 3D seismic (enhanced similarity volume (PaleoscanTM software) Integrated implementation of the karstification features into the geological model using advanced geostastical methods (Multi-Points Simulation, PetrelTM software) Implementation of the resulting enhanced reservoir properties during dynamic simulations and history matching (dual porosity/permeability medium, tNavigatorTM software). After their deposition, carbonate reservoir series are affected by intense karstification during a prolonged period of subaerial exposure. They are consequently marked by widespread erosion; dissolution and collapsing features (e.g., solution cavities, solution-enhanced fractures and brecciated intervals) which were first recognized and picked on the borehole imagery. Typical elongated and dendritical karstic features were then identified through advanced 3D seismic attributes and then deterministically picked as geobodies. This picking was performed using advanced similarity seismic volume, at high resolution, to capture vertical heterogeneities in the karstified interval(s) of the reservoir. Then, Seismic extracted geobodies were implemented as key drivers for reservoir properties into the geological model. Since every brecciated zone on the borehole image could not be captured during the seismic picking (either due to resolution, and/or to low seismic quality zone), an advanced Multi-Points simulation was designed and implemented using the "geobody" property as a "training image" (primary constrain). This method reproduces the characteristics of geobodies, such as trends, orientation, shape, and dimensions. This method filled the resolution gap between seismic image and logs and transferred the multi-scale observations into the geocellular model. The karst-related dynamic properties obtained through this advanced modelling workflow were then refined during history matching and considered as the main driver for variations in well productivity indexes. This tailor-made approach critically impacts redevelopment opportunities that will ultimately safeguard and increase hydrocarbon reserves.

This paper proposes a new methodology for an automatic classification of capillary pressure curves in order to build petrophysical rock-types which, in a second step, are compared to lithofacies for ensuring consistent and significant connection between lithological and petrophysical characteristics. The methodology is based on a pattern recognition strategy, where the curves to be classified are described by a certain number of features. In our approach, the features are derived using a principal component analysis applied to the series of capillary pressure curves under analysis. They correspond to the correlation coefficients of the principal components with the curves that should be classified. Other types of curves could be classified with this approach, for example curves of pore size distribution. This methodology is discussed through an application to the rock-typing of a clastic reservoir, and it is shown that relevant rock-types were obtained based on this classification approach. It is also shown that the classification helps in better quantifying the correspondences between the rock-types and the lithofacies.

THE SOCIOLOGY OF THE CANDIDATES IN THE MARCH 1978 PARLIAMENTARY ELECTIONS, by GILLES FABRE-ROSANE, ALAIN GUÉDÉ A study of the l 812 candidates of the parties prepresented in the National Assembly (RPR, PR, CDS, Parti Radical « valoisien », Mouvement des Radicaux de Gauche, PS and PC) provides an opportunity to consider an intermediate sphere of the political world, which is located between the militants and the « political class ». To the traditional variables such as sex, age, and socio-occupational category have been added more specifie variables such as candidacy in the previous parliamentary elections, local or regional elective mandates and membership of the governing authorities of a party. Some features are shared by all parties and include sex, age, and a certain notoriety reflected in a sound local footing. This study also raises questions concerning the homogeneousness of the majority parties and the diversity of the opposition parties with regard to socio-occupational activities. [Revue française de science politique XXVIII (5), octobre 1978, pp. 840-858.], SOCIOLOGIE DES CANDIDATS AUX ÉLECTIONS LÉGISLATIVES DE MARS 1978, par GILLES FABRE-ROSANE, ALAIN GUÉDÉ L'étude des 1 812 candidats des formations représentées à l'Assemblée nationale (RPR, PR, CDS, Parti radical « valoisien », Mouvement des radicaux de gauche, PS et PC) permet d'aborder une sphère intermédiaire du monde politique qui se situe entre la zone des militants et celle de la « classe politique ». Aux variables classiques telles que le sexe, l'âge, la catégorie socio-professionnelle ont été ajoutées des variables plus spécifiques, comme la candidature aux précédentes élections législatives, les mandats électifs locaux ou régionaux et l'appartenance aux instances dirigeantes d'un parti. On observe quelques traits communs à tous les partis comme le sexe, l'âge et une certaine notoriété reflétée par une bonne implantation locale. Cette étude permet aussi de s'interroger sur l'homogénéité des formations de la majorité et la diversité de celles de l'opposition en ce qui concerne les activités socio-professionnelles. [Revue française de science politique XXVIII (5), octobre 1978, pp. 840-858.], Fabre-Rosane Gilles, Guédé Alain. Sociologie des candidats aux élections législatives de mars 1978. In: Revue française de science politique, 28ᵉ année, n°5, 1978. pp. 840-858.