The Studyon Reservoir Of Yan9Member In Ji Yuan Area

This paper investigates the Yan9group in Jurassic Yanan Formation of Jiyuan area,Ordos basin. Make full use of the core, logging and logging data. Integrated the sedimentologyand logging geology Closely. Research stratigraphic division, sedimentary facies, sand bodydistribution and reservoir characteristics. Yan9reservoir the favorable zone target preferredstudy area based on analysis of oil reservoirs.The results show that: the study area extended the Yan9oil group extension91+2andextension93can be divided into two sand sets; The sedimentary facies major for the deltaplain, and further can be classified as a distributary channel, swamps and natural leveebetween the branch microfacies; Yan9reservoir rock types of lithic quartz sandstone, thegranularity to medium-grained. The porosity of the main types of intergranular pores, followedby feldspar dissolution porosity.Displacement of low pressure into the mercury saturation, lowefficiency of mercury withdrawal, the curve flat section clearly show that the reservoir bettersorting. Yan9reservoirs is a low porosity-low permeability reservoirs, individual is low hole-ultra-low permeability reservoir.Yan9oil group, according to the the reservoir classificationcriteria and data analysis in this area is mainly Class Ⅱ reservoirs, witha wide distribution,the thick characteristics. Reservoir type constraints reservoir of ancient landforms andstructure-lithologic reservoirs, reservoir enrichment is controlled by the oil source, structure,deposition, reservoir, and many other factors. The wide distribution of hydrocarbon sourcerocks oriented area provides a rich source of oil accumulation valley incision is the mainchannel of the oil and gas migration, a large area of distribution of delta distributary channelsand body is the region’s most favorable reservoir. Finally, according to the characteristics of oilreservoirs analysis, the The favorable area preferred target10, forecasting a total area of14.2km~2。...