通过岩心、测井、铸体薄片、扫描电镜等相关资料,对马岭油田延长组长8储层特征及影响因素进行研究.结果表明:马岭油田长8储集岩主要为岩屑长石砂岩和长石岩屑砂岩,成分成熟度低；储层孔隙类型多样,以粒间孔、长石溶孔为最主要的储集空间；物性特征为典型的低孔低渗储层；储层性质明显受沉积相和成岩作用的综合影响,其中,沉积厚度大、粒度较粗的水下分流河道砂体的储集物性最优,其次为河口坝,三角洲内前缘席状砂最差；成岩作用对储层物性有明显的控制作用,压实作用、胶结作用导致储层物性变差,溶蚀作用使储层物性得到较好的改善.%This paper studies the Chang 8 reservoir of Yanchang formation in Maling oilfield of Ordos Basin by using relevant data of cores, logging, cast thin section, and scanning electron microscope. The result indicates that the Chang 8 reservoir is dominated by lithic arkose and feldspathic lithic sandstone, has low compositional maturity; the reservoir presents diverse pore types with the dominant intergranular pores and feldspathic dissolved pores as major reservoir spaces; it is a typical low porosity and low permeability reservoir; reservoir properties obviously subject to sedimentary facies and diagenesis. The best reservoir property is found in underwater distributary channels with thick deposition and coarse grain size, then in mouth bars, and the poorest property is in delta front sheet sands; diagenesis obviously controlled reservoir properties; compaction and cementation had deteriorated reservoir properties; and dissolution had improved reservoir properties.
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