Reservoir Description Of PI Reservoir Of The Putaohua Oil Layer In Fang 169 Block,Songliao Basin

Fang 169 block belongs to Zhaozhou oil field of Daqing,Songliao basin.Reservoir type is fault block oil reservoir.This block has entered the development stage,reservoir description focused on fine geological studies has important theoretical and practical significance for adjustmenting injection-production relationships and slowing down the rate of increase of water ratio and improving the development efficiency of oil field.Based on structural geology,sedimentology,and reservoir description,thesis takes full use of geologic,geophisical,drilling and formation testing data to develop tectonic interpretation,sedimentary microfacies analysis,sand distribution analysis and reservoir characterization evaluation,and combines with the reservoir water flooding characteristics and the use of the situation to advance a reasonable development plan.The main achievements and acquaintances are including:1.Based on testing and drilling data,PI reservoir was divided into 5 layers such as PI2,PI31,PI32,PI4,PI5.and builded formation detailed framework of whole region.2.Make an accurate evaluation about small structure through the detailed siesmic interpretation.Nearly EW and NS-trending fault system cut each other,form many fault block,small structure extensively developed,the main type is little high point and little fault nose structure.3.Analyse single well facies by using log information,identify four Sedimentary Microfacies sunch as underwater channels,mouth bar,sand sheet,frontal mud,define the vertical and horizontal distribution law of sands.The Planar distribution and evolution characteristic of each layer indicate that,at the deposition period of PI5,the lake shrinked and channels from northeast and northwest cutted into the lake water,developed underwater channels;PI4 period,The lake water rose,mouth bar was transformed into large areas of sheet sand;PI32 and PI31 period,the lake began to drop,developed a large number of underwater channels and mouth bar;PI2 period,the lake water rose again,mouth bar is transformed into sheet sands.The whole pattern of sedimentary evolution is lift-dereliction-lift.4.The aeolotropism of reservoir is strong.By making cluster analysis of physical property parameter,divided into three types of reservoirs,the number of class B is largest and it developed focus on underwater channels and sheet sands centralized.5.Integrating with flooding characteristics and use status,comprehensive analysis of remaining oil distribution rule:property fringe area and well pattern unperfect area which the use status is low lead to rich remaining oil;The high points of slightly structure have rich remaining oil because of the gravity differentiation about water flooding.