000			03318nmc a2200277 4500
005			20260520005646.0
008			260224s xxu
082			_aCD W938 1 0013960
210			_aWPC (16th.)
245	0	0	_aSubthust reservoir appraisal
270			_a12/09/06 ; 26/08/2003
300			_a7 p.
520			_aResumen del autor, extraido del trabajo. Foreland fold-and-thrust belts comprise the world’s largest petroleum reserves. However, due to their structural complexity, foothills areas constitute a frontier for the exploration. Apart of imaging the structural closures, reservoir quality constitutes the dominant risk for the exploration in foothills areas and deep subthrust prospects. Main processes involved in the damaging of individual reservoirs and specific conditions resulting in the preservation or secondary development of reasonably good porosity/permeability characteristics in subthrust environments have been documented. They will be compared and discussed here on the basis of representative case studies in Venezuela and Colombia for sandstone reservoirs, and in Albania, Mexico and Pakistan for carbonate reservoirs. Thus, during sedimentary and tectonic burial, both carbonate and sandstone reservoirs are rapidely modified by compaction, pressure solution and fluid-rock interactions, and the understanding and prediction of these issues require careful multidisciplinary approach. Regional structural cross-sections are first compiled and balanced, the resulting restored sections being subsequently used as initial sections for forward kinematic and thermal modeling. This modeling approach in turn provides realistic burial-temperature curves for individual reservoirs, the later curves being then compared with the trapping temperatures measured on fluid inclusions, resulting in a good dating of the main diagenetic cements. Knowing the time span and temperature conditions which prevailed during specific cementation events of subthrust prospects, it becomes now possible touse forward diagenetic models based on the kinetics of fluid-rock interactions to provide realistic estimates on the residual porosity of deep reservoirs. The main damaging episode of subthrust sandstone reservoirs indeed relates to layer parallel shortening (LPS) and coeval quartz cementation developing in the footwall of the frontal thrust. Although paleoenvironment remains the main control for carbonate reservoir, synkinematic hydrothermal brines are also likely to develop secondary porosity in relation to coeval dissolution and/or dolomitisation. Finally, overpressures account also for a delay in the compaction and helps preserving good reservoir characteristics, hydraulic fracturing episodes ultimately predating the onset of LPS and tectonic compaction.
773			_gv. 2, p. 18
942			_cCONGTP
100	1		_aRoure, François _99562
100	1		_aSwennen, Rudy _99563
100	1		_aHowell, David G. _99564
110	2		_aInstitut Francais du Pétrole, IFP _91082
111	2		_aWorld Petroleum Congress (16th. : 2000 jun. 11-15 : Calgary, Alberta, Canada) _934
700	1		_aSwennen, Rudy _99563
700	1		_aHowell, David G. _99564
710	2		_aInstitut Francais du Pétrole, IFP _91082
800	1		_aRoure, François _99562
999			_c133446 _d133446