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- Title
深层一超深层高温极强超压砂砾岩 储层特征及主控因素--以准嚼尔盆地南缘四棵树凹陷高泉地区 白垩系清水河组为例
- Authors
汪孝敬; 白保军; 芦 慧; 梁则亮; 赵长永; 胡 意; 胡 鑫; 李 雷
- Abstract
In order to study the charac teristics of glut enite reservoir under very strong overpressure environment at the depth of 5. 5-6.5 km, the Qingshuihe Formation in Gaoquan Area of Sikeshu Sag in the southern margin of Junggar Basin was taken as the research object, and the rock and mineral, physical proper ties and pore characteristics of glutenite reservoir were analyzed through surface outcrops, cores, SEM, CT scanning, cast and rock thin sections. The influences of sedimentation, diagenesis, structure and overpressure environment on glutenite reservoir were discussed. The results show that the reservoir lithology of Qingshuihe Formation is medium conglomerate, fine conglomerate and sandstone, the rock type is lithic sandstone, the development of micron-scale intergranular pores and intragranular dissolved pores, the widespread development of micro-fractures, and the overall reservoir is ultra-low porosity and ultra-low permeability. Deeply buried compaction is the most important factor of reservoir densification, ・IV・ followed by sedimentary facies belt and lithofacies type, which control the reservoir physical properties and microstructure. The plain subfacies channel is inferior to the front subfacies underwater branch channel, and the physical properties and throat characteristics of fine conglomerate lithofacies are better than those of conglomerate and sandstone lithofacies. The overpressure system slows down the transformation and compaction degree of illite, increases fractures by overpressure and multi-stage tectonic movement, increases dissolution by high-temperature acidic fluids, and improves the quality of reservoirs.
- Publication
Journal of Northeast Petroleum University, 2022, Vol 46, Issue 3, p54
- ISSN
2095-4107
- Publication type
Article
- DOI
10.3969/j.issn.2095-4107.2022.03.005