Research On The Sedimentary Microfacies And Reservoir Characteristics Of Yan 9 Formation In Manjing Area Of Jingbian Oil Field

As China's second largest oil and gas basin,Ordos Basin has been discovered rich oil and gas,which plays an important role in the energy supply.Some progress in the exploration has been made in Mesozoic of Jingbian area in central of Shanbei slope,Triassi Yanchang formation and Jurassic Yan'an formation were important oil-bearing.As one of the main oil-bearing formation,oil-bearing area of Jurassic is increasing,so it will become important replace sets in the future.The Jurassie petroleum is mostly affected by sedimentary facies,reservoir characteristics and tectonic activity,so study of the above contents were necessary for oil and gas exploration in research area.This paper was based on geology,petroleum geology,logging geology as well as drilling cores,logging datum,laboratory analysis,etc.Formation of Yan 9 was divided into Yan 9~1 and Yan 9~2,and established some longitudinal and transversal stratigraphic correlation sections,so completed the division and contrast of formation in the region,and draw the top structure map according hierarchical data,Following results was obtained:a series of nose uplift structure were developmented in this region,and the construction development is succession.Sedimentary and microfacies of Yan 9 formation were analyzed by reference regional geological data,combined with drilling core,logging datum,etc..We think Yan 9 is deltaic plain sunfacies,and found four sedimentary microfacies.The distributary channel of deltaic plain sunfacies extened from southwest to northeast,sand body distribution situation is consistent with it.Reservoir characteristics of Yan 9 shows that:compositional maturity and textural maturity of Yan 9 reservoir are well,reservoir physical was significantly affected by sedimentary facies.Yan 9 reservoir was divided into?,?and?categories reservoir according to reservoir classification standard.Overall,the reservoir properties of Yan 9~2 is better than Yan 9~1.Based on sedimentary facies and reservoir characteristics,taking into account the accumulation of the controlling factors:YanChang formation provided the high quality source rock for Yan'an formation;the effect of conditions of sedimentary facies;traps created by nose tectonic;the effect of diagenesis,etc.Overall,the Yan 9 is lithologic-structural reservoir.Based on the above analysis,favorable exploration zone in Yan 9 formation were forcasted and provided a favorable basis for further exploration and development.