府谷-保德地区山西组储层特征及物性主控因素  

Analysis on Reservoir Characteristics and Main Controlling Factors of Reservoir Physical Properties of Shanxi Formation in Fugu-Baode Area

作　　者：高泉 王冠民[1] 陈纯芳[2] 石晓明 余志强 GAO Quan;WANG Guanmin;CHEN Chunfang;SHI Xiaoming;YU Zhiqiang(School of Geosciences,China University of Petroleum (East China),Qingdao 266555,China;SINOPEC Research Institute of Petroleum Exploration and Production,Beijing 100083,China)

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266555 [2]中国石化石油勘探开发研究院,北京100083

出　　处：《甘肃科学学报》2022年第3期8-15,25,共9页Journal of Gansu Sciences

基　　金：国家自然科学基金(41972131)。

摘　　要：针对鄂尔多斯盆地东部山西组储层非均质性强,储层特征及物性主控因素不明确的特点,综合利用薄片分析、阴极发光、扫描电镜及高压压汞等分析测试手段,并结合沉积相的研究成果,在明确山西组储层特征的基础上,利用SPSS多元回归方法定量表征沉积作用和成岩作用对储层物性的影响并建立回归模型。结果表明,山西组岩石类型为岩屑砂岩和岩屑石英砂岩,砂岩分选好-较好,成分成熟度高,为低孔-特低孔、低渗-特低渗储层。山西组致密砂岩储层受到沉积作用和成岩作用的共同控制。压实作用是储层物性变差的重要因素,平均压实减孔率为82.53%;胶结物以钙质和硅质胶结为主,平均相对体积分数为3.32%,对储层的物性影响有限;溶蚀作用较弱,孔隙类型以原生粒间孔隙为主,占总孔隙的73.21%。回归模型表明,标准偏差、轻矿指数、杂基相对体积分数及溶蚀作用对储层物性影响较大,平均粒径及胶结作用对储层物性影响较小;最有利的储层沉积微相为边滩,分流河道储层物性最差。In view of the strong heterogeneity of Shanxi formation,the main controlling factors of reservoir characteristics and physical properties are not clear of Shanxi Formation in Fugu-Baode area of eastern Ordos basin.By means of thin section analysis,cathodoluminescence,scanning electron microscope and high-pressure mercury injection,combined with the research results of sedimentary facies,the influence of sedimentation and diagenesis on reservoir physical properties was quantitatively characterized by SPSS multiple regression method,and the regression model was established.The results show that the rock types of shanxi Formation are lithic sandstone and lithic quartz sandstone.The sandstone is well sorted and has high compositional maturity.It is from low porosity to ultra low porosity and from low permeability to ultra-low permeability reservoir.The tight sandstone reservoir is controlled by both sedimentation and diagenesis.Compaction is the main factor of poor reservoir physical properties,with an average porosity reduction rate of 82.53%.The cement is mainly calcite cementation,the average volume fraction is 3.32%,which has limited influence on the physical properties of reservoir.The dissolution is weak,and the pore type is mainly primary intergranular pores,accounting for 74.7%of the total pores.The regression model shows that standard deviation,light ore index,heterobase content and dissolution have great influence on reservoir physical properties,while average particle size and cementation have little influence on reservoir physical properties.The most favorable sedimentary microfacies are the beach,and the physical property of distributary channel reservoir is the worst.

关 键 词：鄂尔多斯盆地 山西组 储层特征 储层物性 影响因素 

分 类 号：TE122[石油与天然气工程—油气勘探]