Study On Characteristics Of The Glutenite Reservoir In Li567 Area

On the basis of the collected information,,this paper sufficiently make use of the core,well logging,seismic,test data and the rock and mineral analysis techniques of general slice,casting slice,scan electron microscope,X—ray diffraction,we research on the lithological characteristics,characteristics of diagenesis and reservoir quality.The main diagenetic processes that have impacted on the glutenite reservoir include cementation,compaction,metasomatism and dissolution.The main types of cementation including carbonate cementation,silica cemetation,pyrite cementation and clay cementation.The main diagenetic evolution stage in Li567 area is the phase B of early diagenesis,the phase A of middle diagenesis and the phase B of middle diagenesis.The study area glutenite reservoir is mainly composed of lithic arkose and feldspathic lithic sandstone.The composition maturity and texture maturity.are relatively low.Storage spaces are divided into three kinds :primary pore,secondary pore-cleavage and mixed pore.Because of the condition of secondary pore zones,the intragranular dissolution pores,intergranularpores and moldic pores are commonly.According to the relation between porosity and depth,there is a secondary pore developing zone in the depth of 2850m—3150m.The physical property of reservoir is affected by clastic composition,structural of sediments,clay matrix content,authigenic minerals content,diagenesis and sedimentary facies.Based on the study,we find that the content of quartz can raise the porosity,the detritus,chlorite,illite can decrease the porosity.the effect of diagenesis on reservoir quality includes cementation,compaction and dissolution.The forth two could decrease the porosity of reservoir,but dissolution can raise the porosity of reservoir.the favorable sedimentary face is middle-fan.On the basis of comprehensive analysis of four properties,relations,the standards of physical properties of the effective reservoirs in L567 area are as the follows : the size of particles are thinner than that of(main including conglomeratic sandstone,coarse sandstones,fine sandstones),oil bearing probability is above oil flecked,the porosity is greater than or equal to 6.5% and the permeability is greater than or equal to 0.9×10-3?m2.The electric property of it is as follow:the interval transit time is greater than or equal to 60?m/ft,the deep induction is greater than or equal to 4.5?m.