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| 鄂尔多斯盆地下寺湾地区山西组致密砂岩储层粒度特征及其对储层物性的影响 |
| Granularity characteristics of tight sandstone reservoirs of Shanxi Formation in Xiasiwan area of Ordos Basin and their effects on reservoir physical properties |
| 投稿时间：2020-12-02 修订日期：2020-12-02 |
| DOI： |
| 中文关键词: 鄂尔多斯盆地 山西组一段 粒度特征 致密砂岩 储层物性 |
| 英文关键词: Ordos Basin the first member of Shanxi Formation grain size characteristics tight sandstone reservoir physical properties |
| 基金项目:国家科技重大专项《陆相页岩气成藏主控因素及“甜点”预测》(2017ZX05039-001) |
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| 中文摘要: |
| 为探讨致密储层碎屑颗粒的粒度与储层物性之间的联系，由鄂尔多斯盆地下寺湾地区山西组一段砂岩储层粒度特征入手，通过对46件砂岩岩心样品的粒度参数特征分析统计，结合研究区粒度概率累计曲线特征，与结构参数离散点特征、C—M图特征共同判别沉积环境。研究表明：下寺湾地区山西组一段主要发育细砂岩与中砂岩，其次发育粗砂岩，含少量粉砂与巨砂，分选性较好；目的层致密砂岩粒度概率累计曲线主要为代表河流型的基本两段式与带过渡段的两段式，浅滩型的三段式次之，多段式最少；储层碎屑颗粒粒度与其储层物性间存在联系，伴随着沉积物平均粒径φ值的不断减小，致密储层的孔隙度与渗透率均呈现出负相关关系。本项研究为致密砂岩储层沉积环境的分析以及储层质量的研究与评价提供了依据。 |
| 英文摘要: |
| In order to explore the relationship between the particle size of clastic particles in tight reservoirs and the physical properties of the reservoir, the particle size characteristics of the first member of the Shanxi Formation in the Xiasiwan area of the Ordos Basin were started. Through the analysis and statistics of the particle size parameters of 46 sandstone core samples, Combining the characteristics of the cumulative curve of particle size probability in the study area, together with the characteristics of the discrete points of structural parameters and the characteristics of the C-M diagram, the sedimentary environment is determined. The research shows that the first member of Shanxi Formation in Xiasiwan area mainly develops fine sandstone and middle sandstone, followed by coarse sandstone with a small amount of silt and giant sand, which has good separation properties; the cumulative curve of the particle size probability of the tight sandstone of the target layer is mainly representative of river type The basic two-stage type and the two-stage type with transitional section, the shoal-type three-stage type is the second, and the multi-stage type is the least; there is a relationship between the particle size of the reservoir debris and the physical properties of the reservoir, accompanied by the average sediment diameter φ value With continuous decrease, the porosity and permeability of tight reservoirs both show a negative correlation. This research provides a basis for the analysis of the sedimentary environment of tight sandstone reservoirs and the research and evaluation of reservoir quality. |
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