当前位置: X-MOL 学术Geosci. Front. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Pore structure and heterogeneity of shale gas reservoirs and its effect on gas storage capacity in the Qiongzhusi Formation
Geoscience Frontiers ( IF 8.9 ) Pub Date : 2021-05-31 , DOI: 10.1016/j.gsf.2021.101244
Shangbin Chen , Zhuo Gong , Xueyuan Li , Huijun Wang , Yang Wang , Yingkun Zhang

Fine characterization of pore systems and heterogeneity of shale reservoirs are significant contents of shale gas reservoir physical property research. The research on micro-control factors of low productivity in the Qiongzhusi Formation (Fm.) is still controversial. The lower Cambrian Qiongzhusi Fm. in the Qujing, Yunnan was taken as the object to investigate the influence of mineral compositions on the physical properties of the reservoir and the heterogeneity of shale, using the algorithm to improve the characterization ability of Atomic Force Microscopy (AFM). The results showed that: (1) The pores are mainly wedge-shaped pores and V-shaped pores. The pore diameter of the main pore segment ranges from 5 to 10 nm. Mesopores are mainly developed in the Qiongzhusi Fm. shale in Well QD1, with the average pore diameter of 6.08 nm. (2) Microscopic pore structure and shale surface properties show strong heterogeneity, which complicates the micro-migration of shale gas and increases the difficulty of identifying high-quality reservoirs. (3) The increase of clay mineral content intensifies the compaction and then destroys the pores. Conversely, brittle minerals can protect pores. The support and protection of brittle minerals to pores space depend on their content, mechanical properties and diagenesis. (4) Compression damage to pores, large microscopic roughness and surface fluctuations and strong pore structure heterogeneity are the reasons for the poor gas storage capacity of the Qiongzhusi Fm., which will lead to poor productivity in the Qiongzhusi Fm.



中文翻译:

筇竹寺组页岩气储层孔隙结构、非均质性及其对储气能力的影响

页岩储层孔隙系统精细表征和非均质性是页岩气储层物性研究的重要内容。筇竹寺组(组)低产能的微观控制因素研究尚存在争议。下寒武统筇竹寺组。以云南曲靖为对象,研究矿物成分对储层物性和页岩非均质性的影响,利用算法提高原子力显微镜(AFM)的表征能力。结果表明:(1)孔隙以楔形孔隙和V形孔隙为主。主孔段的孔径范围为 5 至 10 nm。介孔主要发育于筇竹寺组。QD1 井页岩,平均孔径为 6.08 nm。(2) 微观孔隙结构和页岩表面性质表现出较强的非均质性,使页岩气的微观运移复杂化,增加了识别优质储层的难度。(3)粘土矿物含量的增加使压实加剧,进而破坏孔隙。相反,脆性矿物质可以保护毛孔。脆性矿物对孔隙空间的支撑和保护取决于其含量、力学性质和成岩作用。(4) 孔隙受压破坏、微观粗糙度和表面起伏较大、孔隙结构非均质性强是筇竹寺组储气能力差的原因,将导致筇竹寺组产能较差。这使得页岩气的微观运移复杂化,增加了识别优质储层的难度。(3)粘土矿物含量的增加使压实加剧,进而破坏孔隙。相反,脆性矿物质可以保护毛孔。脆性矿物对孔隙空间的支撑和保护取决于其含量、力学性质和成岩作用。(4) 孔隙受压破坏、微观粗糙度和表面起伏较大、孔隙结构非均质性强是筇竹寺组储气能力差的原因,将导致筇竹寺组产能较差。这使得页岩气的微观运移复杂化,增加了识别优质储层的难度。(3)粘土矿物含量的增加使压实加剧,进而破坏孔隙。相反,脆性矿物质可以保护毛孔。脆性矿物对孔隙空间的支撑和保护取决于其含量、力学性质和成岩作用。(4) 孔隙受压破坏、微观粗糙度和表面起伏较大、孔隙结构非均质性强是筇竹寺组储气能力差的原因,将导致筇竹寺组产能较差。脆性矿物对孔隙空间的支撑和保护取决于其含量、力学性质和成岩作用。(4) 孔隙受压破坏、微观粗糙度和表面起伏较大、孔隙结构非均质性强是筇竹寺组储气能力差的原因,将导致筇竹寺组产能较差。脆性矿物对孔隙空间的支撑和保护取决于其含量、力学性质和成岩作用。(4) 孔隙受压破坏、微观粗糙度和表面起伏较大、孔隙结构非均质性强是筇竹寺组储气能力差的原因,将导致筇竹寺组产能较差。

更新日期:2021-06-11
down
wechat
bug