摘要
为了探明鄂尔多斯盆地下寺湾地区延长组储层储集性能,针对研究区储层非均质强,纵向上岩性、含油性变化快,自然产能低等问题,基于铸体薄片、孔渗、压汞等实验分析,开展岩石学、物性、孔隙类型及结构、成岩作用等方面研究。结果表明研究区延长组岩石类型以长石岩屑砂岩和长石砂岩为主,长石含量占30%以上,平均孔隙度为7.03%,平均渗透率为0.285×10^(-3)μm^(2),属低孔、低渗储层;储集空间类型以粒间孔为主,占比59%,其次为长石溶孔。沉积环境与成岩作用是决定储集性能的2个重要因素,分别在宏观与微观上多重因素影响储层发育,其中对沉积微相的认识尤为重要,其展布特征决定储层分布。以上成果认识,为该区实现研究区难采储量的有效动用及有利区的预测提供一定的参考意义。
In order to explore the reservoir properties of Yanchang Formation in Xiasiwan Area,Ordos Basin,reservoir property in the study area on the strong reservoir heterogeneity,the vertical lithology,oil content change fast,natural low capacity,based on the permeability of the casting thin sections,and mercury injection experiments analysis,lithology,physical properties,pore types and structure,diagenesis,etc.The results show that the rock types of Yanchang Formation in the study area are mainly feldspar lithic sandstone and feldspar sandstone,the content of feldspar is more than 30%,the average porosity is 7.03%,the average permeability is 0.285×10^(-3)μm^(2),and it belongs to low porosity and low permeability reservoir.The type of reservoir space is mainly intergranular pores,accounting for 59%,followed by feldspar solution pores.Sedimentary environment and diagenesis are two important factors that determine reservoir performance,and multiple factors affect reservoir development at macro and micro levels respectively,among which the understanding of sedimentary microfacies is particularly important,and its distribution characteristics determine reservoir distribution.The above results provide a reference for the effective utilization of the difficult-to-produce reserves and the prediction of favorable areas in the study area.
作者
王汇智
赵卫卫
杨水胜
王如意
WANG Huizhi;ZHAO Weiwei;YANG Shuisheng;WANG Ruyi(Exploration and Development Technology Research Center, Yanchang Oilfield Co. , Ltd. , Shaanxi Yan’an 716000, China;School of Earth Science and Engineering, Xi’an Shiyou University, Xi’an 710065, China)
出处
《非常规油气》
2022年第1期48-56,共9页
Unconventional Oil & Gas
基金
国家自然基金项目“鄂尔多斯盆地延长组连续型岩性油藏成藏和地质特征”(41102083)。
关键词
延长组
储层特征
下寺湾地区
成岩作用
Yanchang Formation
reservoir characteristics
Xiasiwan Area
diagenesis
