苏北盆地张家垛油田阜三段储层特征及主控因素

利用岩心观察、铸体薄片、扫描电镜及阴极发光等,研究苏北盆地张家垛油田阜三段.结果表明:该储集层岩石类型主要由泥岩、粉砂岩及薄层细砂岩组成;砂泥岩呈互层分布,存在大量泥质条带和生物扰动构造,其中以泥岩、粉砂岩最为发育;粒间溶孔、粒内溶孔、杂基内微孔隙是主要孔隙类型,其中粒内溶孔最为发育;研究区为浅湖亚相沉积,发育坝砂、滩砂和浅湖泥沉积微相,沉积相带、成岩因素是影响研究区储集层物性的重要条件.阜三段储层主要以坝砂为主,其次是滩砂;坝砂粒度较粗,杂基含量低,粒间孔、溶孔发育,砂体厚度大,储集性能好,而滩砂粒度较细,杂基含量高,微孔发育,胶结作用弱,砂体厚度薄,物性相对较差.

Reservoir characteristics of block3 of Funing formation in Zhangjiaduo oilfield,Subei Basin and their main control factors

The research of block 3of Funing formation in Zhangjiaduo oilfield was carried out based on analyzing the data on core observation,cast thin section,scanning electron microscope and cathodoluminescence.Results show that the main rock types of Fu 3intervals are mudstone,siltstone and thin-bedded fine sandstone,with sand shale interbed distribution,much more politic bands and bioturbation structures.The main reservoir pore types include intergranular dissolution pores,intragranular dissolution pores and micropore of heterobases.The sedimentary facies of the target area is shallow lake sub-facies,to be further divided into 3subfacies:dam sand,beach sand and mere mud microfacies.Dam sand and beach sand are the main reservoirs in this area.Dam sand bodies show good reservoir property with coarse granularity,low matrix content,great thickness of sandstones,intergranular and dissolution pores developed.While the beach sand,with fine size,high matrix content,microporous development,low cementation and thin-layered sand body,has relatively bad petrophysical property.