地质科技通报2024，Vol.43Issue(2)：62-74,13.DOI:10.19509/j.cnki.dzkq.tb20220660
致密砂岩储层孔隙结构特征对可动流体赋存的影响:以鄂尔多斯盆地庆城地区长7段为例
Pore throat structure characteristics of tight sandstone reservoirs and their influence on movable fluid occurrence:Taking the Chang-7 Member of Qingcheng area of Ordos Basin as an example
石桓山 1胡望水 1李涛 1李亦博 2卢丹阳 3刘国文1
作者信息
- 1. 长江大学地球科学学院,武汉 430199||长江大学油气资源与勘探技术教育部重点实验室,武汉 430199
- 2. 郑州大学,郑州 450001
- 3. 中国石化河南油田石油工程技术研究院,河南南阳 473000
- 折叠
摘要
Abstract
[Objective]The analysis of pore structure and movable fluid distribution characteristics is the key ele-ment of reservoir research and is also the focus and hotspot of current research.It is of great significance for explo-ring tight sandstone oil and gas and improving oil and gas recovery.[Methods]The Chang-7 Member tight sand-stone reservoir in the Qingcheng area of Ordos Basin was selected as the research object in this paper.Combined with fractal theory,through physical property tests,casting thin section,scanning electron microscopy(SEM),high-pressure mercury injection,and nuclear magnetic resonance(NMR)experiments,the pore throat structure,heterogeneity,and movable fluid distribution characteristics of tight sandstone reservoirs were analysed,and the in-fl uence of the pore throat structure and heterogeneity on movable fluid occurrence was discussed.[Results]The results show that the reservoir space of the Chang-7 Member reservoir in the study area is mainly contributed by mi-cro-nanopores,which have poor pore connectivity.The pore throat radius is mainly 0.050-0.500 μm.The hetero-geneity of the pore throat structure is strong,and the fractal dimension distribution is between 2.65 and 2.90.The fluid mobility is poor,and the movable fluid saturation is distributed between 16.68％and 51.74％,the movable fluid is mostly distributed in medium and small pores.The Chang-7 Member reservoirs in the study area can be di-vided into three types.From the type I reservoir to the type Ⅲ reservoir,the development of residual intergranular pores and intergranular dissolution pores decreases,and the pore connectivity becomes poorer,and the pore throat size decreases,and the content of larger pore throats decreases,and the heterogeneity becomes stronger,and the fluid mobility is worse,and the movable fluid content in the medium and large pores tends to decrease,and mova-ble fluid tends to occur in the small pores.[Conclusion]This study provides a theoretical basis for tight sandstone oil and gas exploration and improving oil and gas recovery.关键词
长7段/致密砂岩储层/孔喉结构/非均质性/可动流体饱和度/鄂尔多斯盆地Key words
Chang-7 Member/tight sandstone reservoir/pore throat structure/heterogeneity/movable fluid satu-ration/Ordos Basin分类
天文与地球科学引用本文复制引用
石桓山,胡望水,李涛,李亦博,卢丹阳,刘国文..致密砂岩储层孔隙结构特征对可动流体赋存的影响:以鄂尔多斯盆地庆城地区长7段为例[J].地质科技通报,2024,43(2):62-74,13.
