Seismic inversion and its applications in reservoir characterization
Krishnakumar Narayanan Nair, Odd Kolbjornsen and Arne Skorstad, review seismic inversion and propose a fast and efficient way of estimating elastic properties and facies probability parameters using the results from inversion and through the incorporation of facies logs.
Well tie, fluid substitution and AVO modelling - A North Sea example
This paper demonstrates how (1) seismic data processing to a near offset stack and (2) petrophysical ly based quality control of P- and S-wave logs can greatly improve the accuracy of seismic modelling at an oil reservoir. The data for the study consisted of raw seismic data from a 3D sail line through a well in a North Sea oil field and a suite of standard logs at the well. A swathe of fully processed 3D data through the we ll was available for comparison. One distinctive feature of the approach described here is the application of a predictive petrophysical mode l (Xu & White 1994, 1995a) to integrating and preparing the logs before building the seismic mode l . Another is t hat we measure the accuracy of our wel l ties (White 1984) and thereby quantify the improvements obtained from processing, log analysis and petrophysical modelling .
Geological, mineralogical and chemical characterization of Devonian kaolinite-bearing sediments for further applications in the ceramic (tiles) industry in La Paz, Bolivia
Clay minerals are widely distributed in Bolivia; among them, illitic clays are most common in the Altiplano where they are mined for use in the ceramic industry that has been growing in the last few years. In addition to illitic sediments, kaolinitic sediments have been recently discovered in sedimentary units in the Bolivian Altiplano. Residual ball clay occurrences in Devonian sedimentary units were studied as part of this work. Geological mapping and geophysical studies (ERT and GPR) were done for better understanding the origin of the deposits and were part of a preliminary study of the mineral potential to define the relationship with the host rock. Chemical and mineralogical techniques such as X-Ray Diffraction, Scanning Electron Microscopy and Inductively Coupled Plasma analyses were performed in samples from the studied area to verify the presence of kaolinite. Atterberg limits and behaviour of the raw material in ceramic specimens supported by chemical analyses show that this material is suitable for manufacturing tile ceramics. This study provides fundamental knowledge for deposit exploitation and future generation of an alternative source of employment for the inhabitants of Micaya.