文章摘要
靖边油田长4+5储层特征及分类评价
Characteristics and classification evaluation of Chang 4+5 reservoir in Jingbian Oilfield
投稿时间:2022-06-28  修订日期:2022-06-28
DOI:
中文关键词: 储层特征  长4+5  孔喉特征  储层物性  储层分类
英文关键词: Reservoir characteristics  Chang4+5  Pore-throat characteristics  Reservoir physical properties  Reservoir classification.
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位邮编
戴亚威 西安石油大学 710065
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中文摘要:
      本文为探究鄂尔多斯盆地靖边地区长4+5储层特征,通过铸体薄片、扫描电镜和压汞实验等对研究区长4+5储层特征进行研究分析,并构建适合本区长4+5储层的综合分类标准。研究发现:储层岩性主要为细粒长石砂岩及少量岩屑长石砂岩,填隙物主要为绿泥石、伊蒙混层和方解石等;储层孔隙类型主要有粒间孔和溶蚀孔,总面孔率平均为4.7%,喉道主要为片状和弯状喉道,孔喉组合类型为小-中孔粗喉型,孔隙度平均为11.95%,渗透率为平均为0.84×10-3μm2,属于低-中孔的特低渗透致密砂岩储层;将研究区孔喉结构分为I类大孔-粗喉、II类中孔-粗喉、III类细孔-细喉和IV类细孔-微喉;综合多因素条件下,将研究区长4+5储层划分为I类优质储层、II类中等储层和III类一般储层,分别占比28%、49%和23%。
英文摘要:
      In order to explore the characteristics of Chang 4+5 reservoir in Jingbian area, Ordos Basin, the characteristics of Chang 4+5 reservoir were studied and analyzed by casting thin section, scanning electron microscope and mercury injection experiment, and a comprehensive classification standard suitable for chang 4+5 reservoir was established. It is found that the reservoir lithology is mainly fine grained arkose and a small amount of lithic arkose, and the interstitial materials are chlorite, Aemon mixed layer and calcite, etc. The pore types of the reservoir are mainly intergranular pores and dissolution pores, and the total face rate is 4.7% on average. The throat is mainly sheet and curved. The pore-throat combination type is small-medium pore and large-throat type, the average porosity is 11.95%, and the average permeability is 0.84×10-3μm2, which belongs to the low-medium pore and ultra-low permeability tight sandstone reservoir. The pore-throat structures in the study area were classified into class I macropore-rough throat, Class II meso-rough throat, class III fine-pore-fine throat and class IV fine-pore-micro throat. Based on multiple factors, chang 4+5 reservoir in the study area can be divided into class I high quality reservoir, Class II medium reservoir and Class III general reservoir, accounting for 28%, 49% and 23%, respectively.
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