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Offshore Carbonate Facies Characterization and Reservoir Quality of Miocene Rocks in the Southern Margin of South China Sea

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Acta Geologica Sinica(English Edition) 2020年第5期94卷 1547-1561页

作者： Hammad Tariq JANJUHAH Abubaker ALANSARI Department of Geology Shaheed Benazir Bhutto UniversitySheringal Upper DirKPKPakistan Department of Geology American University of BeirutRiad El-SolhBeirut11072020Lebanon Department of Geosciences University Technology PETRONAS32610PerakMalaysia

Carbonate rocks are important hydrocarbon reservoirs around the globe and in Southeast Asia a key one,particularly,is the Central Luconia *** the internal characteristics,distribution,geometry and lateral extent of these rocks is essential for exploration and production *** work on Miocene carbonate reservoir facies,north of Bintulu,offshore Sarawak includes qualitative and quantitative analysis of photomicrographs and reservoir quality,considering especially ***,these carbonates are known as Cycles IV and V and are represented by eight major facies types(F-1 to F-8).They comprise:coated grain packstone(F-1)(av.Ф=3%,***=0.5 m D)(av=Average;?=total porosity,and Kh=permeability);massive coral lime grainstone(F-2)(av.Ф=14.7%,***=6 m D);oncolite lime grain-dominated packstone(F-3)(av.Ф=10%,***=4 m D);skeletal lime/dolo-packstone(F-4)(av.Ф=15%,***=4.6 m D);coral(platy)lime mud-dominated packstone(F-5)(av.Ф=4%,***=0.5 m D);coral(branching)lime-dominated pack-grainstone(F-6)(av.Ф=15%,***=1 m D);cross-bedded skeletal lime packstone(F-7)(av.Ф=20%,***=2 m D);and bioturbated carbonate mudstone/chalk(F-8)(av.Ф=8%,***=0.8 m D).Study of thin sections reveals that red algae,foraminifera,and corals are the dominant fossil components with a minor admixture of skeletal fragments of echinoderms,bivalves,bryozoans,and green *** parameters,e.g.,facies characterization,petrography,porosity–permeability value,and microporosity value were utilized to obtain a reliable reservoir *** microporosity value was quantified using digital image analysis software and is significant for recognition of good reservoir *** of the presence of microporosity against the total porosity in the carbonate rocks has improved the correlation coefficient(R2)value,which has increased from 0.51 to 0.82.

关键词： carbonates petrography grain types porosity-permeability hydrocarbons microporosity offshore Sarawak

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