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- Title
鄂尔多斯盆地致密砂岩储层孔喉分布特征 及其差异化成因.
- Authors
王伟; 朱玉双; 余彩丽; 赵乐; 陈大友
- Abstract
The micro-nano pore throat system widely developed in tight sandstone is the essential difference be⁃ tween tight sandstone reservoir and conventional sandstone reservoir,and is also the main factor affecting the seepage characteristics and development effect of tight sandstone reservoir. This thesis analyzed the pore-throat types and distributions of Chang6 and Chang7 reservoirs in Jiyuan area of Ordos Basin,and discussed the origi⁃ nal causes of them by cast section,SEM,and constant-rate mercury injection. The results showed that:The pore type of Chang6 reservoir is predominantly residual intergranular pores,and the throats are mostly compact⁃ ed,the pore of Chang6 is more developed than throat. The pore type of Chang7 reservoir is mainly feldspar solu⁃ tion pores,and the throat is mostly dissolution,the throat of Chang7 is more developed than pore. The pore ra⁃ dius distribution range and average value of Chang6 reservoir are similar to those of Chang7 reservoir. The distri⁃ bution range and average value of throat radius of Chang6 reservoir are obviously larger than that of Chang7 res⁃ ervoir,and the physical property of Chang6 reservoir is better than that of Chang7 reservoir. The Chang6 reser⁃ voir is located in delta sediments with shallow burial depth. The high chlorite membrane content and low com ⁃ paction strength of Chang6 reservoir make it better to maintain the original sedimentary pore space,and the dis⁃ solution further enlarges the pore space. Chang7 reservoir is located in lacustrine sediments with a large burial depth. The compaction and cementation of Chang7 reservoir are strong,and the original sedimentary pore space is massively compressed. Although dissolution occurs in the later stage strongly,the connectivity and seepage capacity of the throat of dissolution origin are lower than those of compaction origin. Dissolution can increase the reservoir space,but it cannot significantly improve the seepage capacity. Therefore,there is a significant differ⁃ ence in permeability of the two successive layers.
- Subjects
RESERVOIRS; SEEPAGE; PERMEABILITY; FELDSPAR; COMPACTING; SANDSTONE; MERCURY
- Publication
Natural Gas Geoscience, 2019, Vol 30, Issue 10, p1439
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2019.06.006