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Distribution and Impact on Reservoir Properties of Authigenic Carbonate Minerals in Pyroclastic Rocks of Beier Depression,Hailaer Basin

DONG Lin-sen1,2,LIU Li1,ZHU De-feng3,GUI Li-li1,YU Miao1 (1.School of Earth Sciences,Jilin University,Changchun 130061,Jilin,China;2.Key Laboratory of State Oceanic Administration for Marine Sedimentology and Environmental Geology,First Institute of Oceanography,State Oceanic Administration,Qingdao 266061,Shandong,China;3.Institute of Exploration and Development Research,Daqing Oilfield Limited Company,China National Petroleum Corporation,Daqing 163712,Heilongjiang,China)  
In order to verify the distribution and impact on reservoir properties of authigenic carbonate minerals in pyroclastic rocks,pyroclastic rocks in Beier Depression of Hailaer Basin were taken as an example;the type of authigenic carbonate minerals were investigated;the distribution and impact on reservoir properties were discussed according to the statistic of carbonate content and reservoir properties for more than 50 wells.The results showed that authigenic carbonate minerals in pyroclastic rocks of Beier Depression,Hailaer Basin were mainly calcite and dolomite,followed by siderite,dawsonite and ankerite;there were two high-value zones of carbonate content vertically,in 1 500-1 900 m and 2 200-2 700 m respectively,and the former mainly contained intergrowth calcite cements,granular calcite cements and siderite,the latter mainly contained late calcite,dolomite,ankerite and dawsonite;the most favorable facies belts for the development of carbonate cements was sublacustrine fan facies,followed by fan-braided fluvial river deltas facies;the carbonate content in wells close Deerbugan deep fault was higher than that in wells away from it,and there were dawsonites in wells De2,De6 and De8 near the fault,mainly because the fault was the channel for CO_2 dispersion and CO_2-rich fluid could react with the surrounding rocks and then the carbonate minerals formed;the carbonate contents in ignimbrite and tuff were higher than that in sedimentary tuff,tuffaceous sandstone and common sandstone,mainly because the contents of metal ions in pyroclastic material were high,and the ions were easy to release,which combined with carbonate ions to form carbonate minerals;the porosity and permeability in Beier Depression were negatively correlated with the content of carbonate.
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