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Conventional and Fractal Variogram Based on Time—Space Analysis of Seismicity Distribution—Case Study: Algeria Seismicity (1673-2010)

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Journal of Geoscience and Environment Protection 2018年第11期6卷 147-172页

作者： Moh-Amokrane Aitouche mabrouk djeddi Department of Geophysics Faculty of Hydrocarbons and Chemistry Earth Physics Laboratory University of Boumerdes Boumerdes Algeria

Geostatistics belongs to the wide class of statistical methods. It is used and applied to analyze and predict the values associated with spatial or spatio-temporal phenomena such as seismological events. Thus, in addition to its adaptability to perform spatial data analysis based on the principles of variography, many other methods more representative of the spatial distributions of the epicentres have been experimented. The unidirectional or isotropic fractal variogram associates the criterion of variance with the fractal dimension which is a better descriptive parameter of the spatial organization of events. The same analysis procedure carried out through a directional or azimuthal variogram introduces the context of a preferential direction of earthquake evolution. Moreover, b-value is a privileged seismological parameter that can be studied alone or in combination with other more advanced geostatistical analysis factors such as fractals, fractal dimensions and the anisotropic variogram. All these concepts were used as methodology for a protocol of analysis of the catalog of the Algeria seismicity including 1919 events for the period extending from 1673 to 2010. This catalog is provided by the compilation of partial catalogs synthesized by the CRAAG (Research Centre in Astronomy, Astrophysics and Geophysics).

关键词： Algeria Seismicity Catalog b-Value Geostatistics Semiv Variogr Am Fractal

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The Integrated Approach to Seismic Attributes of Lithological Characterization of Reservoirs: Case of the F3 Block, North Sea-Dutch Sector

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Open Journal of Earthquake Research 2020年第3期9卷 273-288页

作者： Oumarou Sanda djeddi mabrouk Tabod C. Tabod Jean Marcel Jean M. Abate Essi Simon Ngos III National Institute of Cartography Yaoundé Cameroon Department of Physics Faculty of Science University of Maroua Maroua Cameroon Department of Geophysics Faculty of Hydrocarbons and Chimistry M’Hamed Bougara University of Boumerdès Boumerdès Algeria Department of Physics Faculty of Science University of Yaoundé 1 Yaoundé Cameroon Department of Physics Faculty of Science University of Bamenda Bamenda Cameroon Ore Processing Laboratory Institute for Geological and Mining Research Nlongkak Yaoundé Yaoundé Cameroon Department of Exploration Faculty of Mining and Petroleum Industries University of Maroua Kaélé Cameroon

Technological development, particularly the development of signal processing, has contributed to the improvement of the quality of results in the analysis of the characteristics of hydrocarbon reservoirs. This scientific advance is especially marked by the introduction of seismic attributes in the characterization of reservoirs. This paper is aimed at evaluating the contribution of seismic attributes in the lithological characterization of hydrocarbon accumulation zones. Thus, it has been found that instantaneous attributes make it possible to highlight the different properties of reservoir rocks. Techniques for extracting three-dimensional volume attributes have been applied to a 3D seismic data volume of the F3 block in the Dutch sector of the North Sea. The purpose of using these volume attributes is to extract signal characteristics from lithofacies in hydrocarbon zones. The results provide a remarkable contribution to instantaneous seismic attributes in reservoir location, hydrocarbon detection, and reservoir lithological prediction. The instantaneous amplitude, the derivative of amplitude 1, the factor Q, the energy and the Hilbert transform are attributes which highlight the presence of hydrocarbons through the bright spots. Thus, curvature, similarity, dip, and coherence are useful in the determination of traps such as faults and anticlines. The crossing of the instantaneous amplitude and the instantaneous frequency makes it possible to analyze the lithofacies. In the same way, the analysis of the crossed diagrams between the porosity and the instantaneous amplitude made it possible to define the different layers of the reservoir.

关键词： Seismic Seismic Attributes Characterization Lithology Reservoir

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