Research On Reservior Characteristics Of Yan-9Oil Reservoir Set In Wuqi Area In Ordos Basin

The Yan-9oil reservior set in Jurassic systerm of Yanan Formation wasimportant oil horizon in Wuqi area. The reservior-forming process of stratum iscomplex.receive multi-factor control oil deposit possess lesser-scope. the trail ofdistributiong was relatively dispersive The Yan-9oil reservior set of this researchmain be middle thin-middle-gritstone chiltern.conglomeratewithlight gray,grayishbrown,cinereus.exist a small number of granule conglomerate and silty mudstone.Lithology give first of in order to arkose lithic feldspar standstone feldspathic quartzsandstone contain feldspar lithic sandstone lithic sandstone and lithic quartzsandstone.The structure of Clastic rocks main include clastic particles.interstitialmaterial.Architectural feature of clastic particles general include granularity,sphericity, shape, roundness and surface feature of the granular.Granular size major bemiddle-fine gravel,visual coarse grain and unequal grain. Granule roundness wasordinary,degree of sorting in order to medium-well.Cementation type main beporosity,support for particle and porous cementation. Poretype main be intergranularhole(intragranular vugular pore space),feldspar vugular pore space. Sandstonereservoir main experience compaction,pressure solution, agglutination, dissolution,metasomatism and authigenic mineral formation effect. The oil layer group in acertain condition junior diagenetic stages A stage.Reservoir developmental majorgoverning factor be sedimentary characteristics,diagenesis.Sedimentary characteristicsinclude sedimentary microfacies type petrologic feature,sedimentary cycle etc.TheYan-9oil reservior main sedimentary microfacies possess floodplain microfacies,natural levee microfacies,topo-visual fan conglomerate microfacies,the reservoirstratum in floodplain microfacies be well than other microfacies.Diagenesisconstructive main be early stage chlorite agglutination,dissolution.authigenic mineralformation effect.