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辽河盆地牛心坨油田牛心坨油层属扇三角洲湖相 (湾 )沉积 ,其沉积环境的差异导致砂岩储层存在较严重的非均质性。岩心描述和常规薄片、铸体薄片、扫描电镜、粘土矿物 X-衍射分析及压汞资料研究表明 ,牛心坨油层的岩石类型主要为岩屑长石砂岩 ;砂岩储层以前扇三角洲的远砂坝、扇三角洲前缘的砂质分流河道砂、砾砂质分流河道砂及河口坝砂的物性最好 ,席状砂、滩坝砂和前缘砾质分流河道砂、前缘砂次之 ,扇三角洲平原的砾质水道砂、砾砂质水道砂、砂质水道砂物性最差 ;储层孔喉分布状况差、结构复杂、喉道细小且不均匀是该套储层的突出特点 ;成岩作用是影响储层微观非均质性的重要因素。
The Niuxin Tuo oil layer in Niuxintuo oilfield of Liaohe Basin belongs to the facies lacustrine (Gulf) deposition of the fan delta. The differences of sedimentary environment lead to serious heterogeneity of sandstone reservoirs. Core description and conventional thin sections, cast thin sections, scanning electron microscopy, X-ray analysis of clay minerals and mercury intrusion data indicate that the rock types of Niuxintuo oil layer are mainly lithic feldspar feldspar sandstone; The physical properties of sandy distributary channel sand, gravel sandy distributary channel sand and estuary bar sands in the front of the dam and fan delta are the best. Sand, beach bar sand and front gravel distributary channel sand, Fan delta plain gravel channel sand, gravel sandy channel sand, sandy channel sand properties of the worst; reservoir pore throat distribution is poor, the structure is complex, the throat is small and uneven is the reservoir of outstanding features; Diagenesis The role of reservoir micro-heterogeneity is an important factor.