Forum I provided an insight into basin-wide studies of a number of sedimentary basins around the world and gave a fascinating overview into the systematic approach of basin analysis studies by one of the major oil companies. The first paper by workers (Jianyi HU et al.) of CNPC's Research Institute of Petroleum Exploration and Development detailed the integrated study of the cratonic composite Ordos basin. The main sedimentary elements of this basin are formed by Lower Paleozoic carbonates covered by a Lower Paleozoic marine and non-marine coal- bearing sequence and overlain by Meso-Cenozoic inland clastic rocks. Multiple composite oil and gas associations are present; the Mesozoic is character- ized by producing oil and the Paleozoic by produc- ing dry gas. Integrated studies with the aid of a number of state of the art exploration techniques, such as detailed geochemical analysis, reservoir diagenesis and high resolution seismic surveys have unravelled the complex history of the Ordos basin. Further explora- tion targets have been identified. The questions from Messrs. L. NOVELLI (Agip) and D. WELTE (Germany IES) and P. GERLING (Germany GBR) addressed the type and maturity of the source rocks, generation modelling and isotopic characteristics of the gas occurrences. The second paper by Tom S. LOUTIT et al. dis- cussed the petroleum systems of the North West Shelf of Australia. This paper highlighted the importance of the detailed understanding of the distribution of the various source rocks in this area. To date, based on the presently discovered hydrocarbons, four super- systems appear to be present. The author addressed the questions how many systems are present on the North West shelf. To answer this question a number of approaches have been pursued with particular emphasis on the definition of oil families based on hydrocarbon analysis. This analysis suggest the pres- ence of a significant new non-marine-lacustrine system increasing the number of super systems to five. The application of sequence stratigraphic prin- ciples supported by high quality biostratigraphic and geochemical databases may lead to a better predic- tion of the timing, location and mass of organic-rich- rocks. This may provide an important stimulus to ongoing search for new petroleum resources in this active exploration area. The third paper by workers M. S. MALLA et al. from the Exploration Division of Sonatrach in Algeria gives an excellent overview of the structural evolution and hydrocarbon generation of the Gha- dames and Illizi basins. The hydrocarbon source rocks ranging in age from Ordovician to Carboniferous have been studied in detail and emphasize the richness and extensive occurrence of these rocks in these basins. The thermal evolution of the organic matter indi- cates a lar

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