The Study On The Reservoir Characteristics And Its Influence In Fuyu Reservoir Of Daqing Oilfield

The exploration and development of reservoir of the Fuyu oil reservoir of the Daqing placanticline is mainly about the high permeability oil reservoir in recent decades,but as development of exploration and development going deep,the production of the low permeability oil reservoir increasing every year,the low permeability oil reservoir has become the new main battlefield for the increasing production of oil and gas.Therefore,systematic study the characteristics of low permeability reservoir and the main control factors have become the most urgently needed and the most basic tasks.This paper is about the Fuyu oil reservoir of the Daqing placanticline.The characteristics of the reservoir is low permeability with physical character of reservoir varied greatly vertically and relatively difficult in reservoir prediction.Comprehensivly using petroleum geology,mineralogy,sedimentary petrology and structural geology and other related professional knowledge,combine with using the method of reservoir research techniques,such as polarizing microscope and scanning electron microscopy,X-ray diffraction and image analysis software system,etc.,to carry out the comprehensive research of reservoir characteristic of low permeability oil reservoir.Complete the research of the petrology characteristics and physical property characteristics,reservoir space types and structure,reservoir diagenesis and reservoir controlling factor analysis of the study area Fuyu oil reservoir.The results show that the conventional reservoir of the fuyu oil layer in is given priority to with low mud/calcium sandstone,dense layer is given priority to with high mud/calcium sandstone percentage increased;the mineral composition of reservoir type affects obviously,quartz and feldspar are favorable for forming reservoirs;The grain composition of the conventional reservoir of the Fuyu oil layer is mainly about middle-fine sandstone,while the grain composition of the dense layer is mainly about siltstone,and high content of mud,the influence of particle size to dense sandstone reservoir is weak,the relationship between the granularity and the correlation property is poor;For pore structure,the pore throat of the conventional reservoir of the fuyu oil layer is thick,the average radii of pore throat is about 100nm~1000nm.the pore throat of the dense reservoir of the fuyu oil layer is thin,about 50nm~500nm.Mechanical compaction,cementation and dissolution are important factors to the reservoir diagenesis,Mechanical compaction plays a leading role in broking the reservoir,cementation function can lead main influences in some parts,dissolution is the favorable diagenetic control factors to improve the reservoir structure and forming reservoir.