000			02375nab a2200205 4500
005			20260520002148.0
008			260224s2019 xxu ing
041			_aInglés
245	0	0	_aEfect of micrite content on calcite cementation in an upper jurassic carbonate reservoir, eastern Saudi Arabia
260			_a _b _cene. 2019
270			_a02/08/2019 ; 02/08/2019
300			_a11 p. ; 79-90
520			_aTranscripción del resumen del autor: Cementation is a primary factor reducing the porosity of carbonate rocks. It is a challenge to accurately model cementation for reservoir quality prediction because cementation is often a syndepositional process. In addition, cementation requires fluid flow to transport chemical species for precipitation within the pore spaces in a sediment. The development of fully-coupled depositional-hydrogeochemical models for cementation prediction is desirable, but the parameters which control the extent of cementation need to be identified and evaluated. This study uses petrographic data from 583 carbonate samples from 15 wells in an Upper Jurassic (Kimmeridgian) reservoir at a giant oilfield in eastern Saudi Arabia to investigate the controlling effects of micrite content on cementation in carbonate rocks. The results indicate that the amount of cement decreases with increasing micrite content in the carbonate rocks analysed. In addition, a modified Houseknecht method has been developed to assess the relative fractions of porosity reduction in carbonate sediments due to compaction and cementation. The method highlights variations in depositional porosity for different rock textures and distinguishes microporosity from interparticle porosity. In the studied samples, the total porosity loss due to compaction and cementation is generally less than 45%, and samples lose more porosity due to compaction than cementation. The relative importance of compaction and cementation in reducing porosity is different for different rock textures: wackestones and mudstones lose porosity mostly as a result of compaction, while grainstones, mud-lean packstones and packstones lose porosity due to both compaction and cementation.
581			_a1
773	0		_tJournal of Petroleum Geology _g
942			_cARTICULO
100	1		_aZhang, Shuo _959136
100	1		_aLu, Peng _959137
999			_c193104 _d193104