鄂尔多斯盆地姬塬地区G27区块长4+5储层特征研究

根据姬塬地区延长组长4+5段储层砂岩的岩石薄片、铸体薄片及高压压汞等分析测试资料,结合前人成果,对延长组长4+5段储层特征进行了进一步研究。其储集砂体大部分属于三角洲沉积体系中的三角洲前缘亚相沉积,主要为细粒长石砂岩、岩屑长石砂岩以及少量的长石岩屑砂岩。其颗粒大多呈次棱状,分选较中-好。储集空间主要存在原生粒间孔,岩屑溶孔,长石溶孔,粒间溶孔,晶间孔及微裂缝几种孔隙类型。储层毛管压力曲线形态以单平台型为主,双阶梯形其次,孔隙结构总体上以中孔、中细喉为主,储层物性呈现出低孔隙低渗透的特征。

Ordos basin G27 kyi tableland area blocks long 4＋5 reservoir characteristics research

According to ordos basin kyi tableland areas extend leader paragraph 4 ＋ 5reservoir sandstone rock thin section,casting thin sections and analysis of test data,such as high pressure mercury combined with previous research results,to extend the leader paragraph 4 ＋ 5reservoir characteristics are studied.Most of its reservoir sand body are the delta sedimentary system in the delta front deposition,mainly for fine-grained arkose,lithic arkose and a small amount of feldspar lithic sandstone.Particles are mostly ribbed,sorting- good.Reservoir space is mainly exists residual original intergranular pore,intergranular solution pores,feldspar dissolved pore,lithic dissolved pore,intercrystalline pore and porosity of several types.Reservoir capillary pressure curve is given priority to with single stage type,double step second,pore structure on the whole is given priority to with in the hole,the fine throat,reservoir property presents the characteristics of low permeability reservoirs.Upward vertical and horizontal reservoir with strong heterogeneity,diagenesis are the main factors that affect the reservoir performance.