000			01682nab a2200205 4500
005			20260520000223.0
008			260224s2009 xxu
100	1		_aEhrenberg, S.N. _913453
100	1		_aNadeau, P.H. _935901
100	1		_aSteen, O. _942055
245	0	0	_aPetroleum reservoir porosity versus depth _bInfluence of geological age
260			_coct. 2009
270			_a30/10/2009 ; 30/10/2009
300			_a15 p. ; 1281-1296
520			_aTranscripción del resumen del autor: Average porosity values for the producing zones of oil and gas fields worldwide are examined as a function of the present depth for sandstone and carbonate lithologies divided into 10 groupings by reservoir depositional age (Precambrian–Silurian to Pliocene–Pleistocene). The wide variations in average reservoir porosity within each depth range reflect the extreme ranges in porosity-controlling factors such as depositional facies, early diagenetic histories, geothermal gradients, and degrees of uplift from previous maximum burial that exist in the Earth's petroleum reservoirs. Median porosity for a given depth nevertheless decreases with both increasing depth and age in most age and lithology categories examined. Maps of reservoir geographic distributions corresponding with each porosity-depth plot show the Earth's petroleum provinces in terms of reservoir ages and lithologies. The results demonstrate quantitatively and empirically the degree to which porosity is related to depth, lithology, and geological age on the global scale of observation.
581			_a10
773	0		_tAAPG Bulletin _g93
942			_cARTICULO
999			_c170593 _d170593