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- W2359084162 abstract "By means of core observation,thin section identification,image analysis,mercury penetration, petro-physical property testing and other technical methods,the low permeability reservoirs of Ess 4 were studied in the north zone of Bonan Sag.The diagenesis of low permeability reservoirs of Ess 4 is characterized by strong compaction,multistage of dissolution and cementation,and lime-mud matrix recrystallization. Confined by conditions ofreservoir diagenesis evolutionary sequence and reservoir pore structure,physical properties of the reservoirs in geological history were restored.The geological time when reservoirs of different lithology in different sub/micro-facies form low-permeability properties were determined based on the reservoir property evolutionary history.Genetic mechanisms of low permeability reservoirs of sandy conglomerate were investigated.There are five different genetic types of reservoirs.The characteristic of typeⅠreservoir is that its low permeability and extra-low permeability are caused by compaction,while its ultra-low permeability is caused by lime-mud matrix recrystallization.The characteristic of typeⅡ reservoir is that its low permeability is caused by compaction,while its extra-low permeability and ultra-low permeability are caused by cementation;The characteristic of typeⅢreservoir is that its low permeability and extra-low permeability are caused by compaction;The characteristic of typeⅣreservoir is that its physical property is improved by dissolution,while its low permeability is caused by compaction;The characteristic of typeⅤreservoir is that its low permeability is caused by compaction,while its extra-low and ultra-low permeability are caused by compaction and cementation.According to a matching relationship between the reservoir compaction history and the hydrocarbon accumulation history as well as results from oil testing, typeⅣreservoir had high permeability in the hydrocarbon accumulation period and shows low permeability now,which is the best reservoir and has the best exploration potential;TypeⅢreservoir had medium permeability in the hydrocarbon accumulation period and shows extra-low permeability now,which is better reservoir and has medium exploration potential;TypeⅤreservoir had low permeability in the hydrocarbon accumulation period and shows ultra-low permeability now,which is medium reservoir and has poor exploration potential;TypeⅠreservoir had extra low permeability while typeⅡlow permeability reservoir had medium permeability in the hydrocarbon accumulation period.Both of these two types of reservoirs show impermeability now,which are poor reservoirs and have little exploration potential." @default.
- W2359084162 created "2016-06-24" @default.
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- W2359084162 date "2013-01-01" @default.
- W2359084162 modified "2023-09-24" @default.
- W2359084162 title "Genetic Mechanisms and Classified Evaluation of Low Permeability Reservoirs of Es_4~s in the North Zone of Bonan Sag" @default.
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