【摘要】 为精细评价低渗储层,降低油田开发风险,针对油田范围内储层岩性复杂、低孔低渗等特点,通过岩心、铸体薄片、阴极发光、扫描电镜以及ECS测井等资料对沙一二段储层的岩性、储集空间类型、储层物性及其主要控制因素进行了系统分析,在此基础上对储层进行了评价。综合研究认为:(1)储层发育火山角砾岩、凝灰质砂砾岩、砂砾岩、碳酸盐岩、混积岩、灰质砂岩等6个岩性段,储集空间类型以次生孔隙为主,孔隙度分布于5.1%～34.6%,渗透率分布于0.15～340 mD;(2)沉积作用和成岩作用是控制研究区内储层物性主要因素;(3)将低渗储层划分为了3类,Ⅰ类储层主要为混积岩,溶蚀孔最为发育,孔隙度大于15%,渗透率大于6.5 mD,是开发动用的"甜点"。以上成果认识对油田高效开发具有重要指导意义。更多还原

【Abstract】 For the reservoir fine evaluation, and reduce the oilfield development risks, on the problem of the characteristics of lithofacies diversity, complicated diagenesis, low porosity and permeability, based on the identification of cast slice, cathode luminescence, scanning electron microscopy, X-ray scattering techniques and mercury injection data, lithology, pore types and structure and so on are studied. There are three main leading ideas:(1) the types of the lithology include volcanic breccia, tuff gritstone, glutenite, carbonate rocks, mixed rock and the calcareous sandstone. The main type of reservoir space is the secondary pore, the porosity is mainly distributed in the 5.1%～34.6%, the permeability is mainly distributed in the 0.15～340 mD;(2) the main control factors of the reservoir attributes is the sedimentation and the diagenesis;(3) three kinds of reservoirs are identified. Class Ⅰ is the "sweet spot" in the low permeability reservoir, oolite and organic clastics are the main components, dissolution pores are developed, the porosity is greater than 15%, and the permeability is grater than 6.5 mD. the understanding of the above achievements is of great significance to the efficient development of the oilfield.更多还原