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Geological significance of seismic reflections and imaging of the reservoir architecture in the Malampaya gas field (Philippines)

¹ Formation de Recherche en Evolution - Centre National de la Recherche Scientifique 2761, Laboratoire de Géologie des Systèmes Carbonatés, Case 67, Université de Provence, 3, Place Victor Hugo, F-13331 Marseille Cedex 03, France; Francois.Fournier{at}up.univ-mrs.fr
² Formation de Recherche en Evolution - Centre National de la Recherche Scientifique 2761, Laboratoire de Géologie des Systèmes Carbonatés, Case 67, Université de Provence, 3, Place Victor Hugo, F-13331 Marseille Cedex 03, France

François Fournier received his M.Sc. degrees from the Nancy School of Mines (France) and from the Institut Français du Petrole and a Ph.D. in carbonate sedimentology from the University of Provence in Marseilles (France). After a short experience in oil companies as an exploration geologist in France and Angola, he joined the Geology of Carbonate Systems Laboratory (Marseilles, France) as lecturer in 2005. His research focuses on the relationship between sedimentology, diagenesis, and seismic reflections in carbonate reservoirs.

Jean Borgomano obtained a Ph.D. in carbonate geology in 1987 at the University of Provence in Marseilles (France). In 1988–2003, he worked at Shell as senior carbonate geologist in various exploration and production Shell companies. He is currently a professor at the University of Provence and the director of the Geology of Carbonate Systems Laboratory. His research focuses on the geological characterization and numerical modeling of carbonate reservoir architecture and properties.

The integration of petrographic analyses of cores and thin sections, petrophysical measurements, and well logs demonstrates that variations in acoustic impedance in the Malampaya buildup (upper Eocene to lower Miocene, offshore northwest Palawan) are related to vertical changes in porosity and pore type, which are dominantly controlled by diagenetic processes. The Nido Limestone was subdivided into 10–50-m (30–150-ft)-thick units characterized by specific diagenetic patterns and petrophysical properties (diagenetic units). The alternation between tight and porous diagenetic units is mainly controlled by meteoric diagenesis (leaching and pedogenesis) and by late-burial cementation and leaching. Well-to-seismic ties show that the main seismic reflectors within the buildup interior reflect the boundaries between diagenetic units. Most of the negative amplitude reflectors are related to unconformities, whereas positive amplitude reflectors have a more questionable chronostratigraphic value and may represent the bases of cemented lenses that can crosscut time lines. Comparison with other southeast Asian Tertiary buildups indicates different origins of seismic reflections related to distinct patterns of diagenetic evolution. The identification of such seismodiagenetic units and of their controlling factors is of paramount importance for the architecture and the petrophysical characterization of carbonate reservoirs.

This article has been cited by other articles:

				J. R. F. Borgomano, F. Fournier, S. Viseur, and L. Rijkels Stratigraphic well correlations for 3-D static modeling of carbonate reservoirs AAPG Bulletin, June 1, 2008; 92(6): 789 - 824. [Abstract] [Full Text] [PDF]