000			02363nab a2200181 4500
005			20260520001757.0
008			260224s2009 xxu
245	0	0	_aComplex geology and pressure tests
260			_a _b _cdic. 2009
270			_a16/06/2010 ; 16/06/2010
300			_a8 p. ; 181-188
520			_aTranscripción del resumen del autor. The focus of this work is on the evaluation of well-test (single well and interference) responses in systems with complex geology where the assumption of statistical homogeneity does not hold. A 3D array (ordered set) of values for the properties of the porous medium (porosity cube) as a function of the coordinates is used to understand well-test responses. This array of values contains all relevant information available from prior geological and geophysical interpretations, core and outcrop measurements and rock physics. As this model is constrained by geological considerations, the underlying permeability field is nonGaussian. Characteristics of interference-test responses in the context of the reciprocity principle are discussed. Evaluations of transmissivity and storativity by various measures are given. Quantitative evaluations of tests along classical lines by the methods suggested by Theis or Jacob are compared with estimates obtained by the flow-based, upscaling technique. In the specific examples considered here, it is shown that estimates of transmissivity from pressure tests are much different from the upscaled estimate. For systems with complex geology, we show that measures of point values of permeability such as the median must account for connectivity within the reservoir before such measures may be used to reflect permeability. Both well-test and upscaled estimates of transmissivity are significantly higher than the median value corresponding to point values of permeability within the porosity cube. Estimates of the storativity product are also different from the upscaled estimate. Such differences are problematic in that the conservation of mass principle is violated. The results emphasize that it is essential to use geological models to obtain a realistic estimate of reservoir properties.
581			_a3-4
773	0		_tJournal of Petroleum Science & Engineering _g69
942			_cARTICULO
100	1		_aRaghavan, Rajagopal _926633
999			_c171136 _d171136