Diagenesis Of Huzhuangji Oilfield In Dongpu Depression

At present,the predecessors have conducted a lot of research on the reservoirs in Huzhuangji oilfield.However,there have been few studies on the diagenesis and pore evolution of deep reservoirs in the past work.In order to study the diagenesis and processes of the diagenesis of deep reservoirs in detail,this paper takes the middle section of 3~rdd member Shahejie Formation,Huzhuangji Oilfield,as the research object.Firstly,sedimentary microfacies and sandbody distribution were studied based on regional geological characteristics to analyze the type of diagenesis and the diagenetic stage to made a model of diagenesis.Secondly,by analyzing the effective pore composition and characteristics of the reservoir was established to determine the favorable area of the reservoir.The results of the study indicate that the delta frontal subfacies of the reservoir in the middle section of third member of Huzhuangji reservoir is developed,including underwater distributary channels,estuary dams,and mat sands,etc.In all kinds of diagenesis,compaction,carbonate cementation,secondary enlargement of cementation and metasomatism of quartz,cementation and exchange of hard gypsum are the main reasons for the compactness and low permeability of reservoirs,and the dissolution of particles and carbonate minerals improves the physical properties of the reservoir.The reservoir evaluation shows that the middle and deep reservoirs in the Huzhuangji area are divided into three types of reservoirs.The type I and?reservoirs are effective.