| 内蒙古二连盆地不同岩性潜山储层特征及其影响因素 |
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| 关键词:buried-hill tuff granitic-cataclasite hydrothermal fluids fractals Erlian Basin |
| 基金项目:中石油“十二五”重大研究课题“二连盆地富油凹陷深化勘探潜力与方向研究”(编号: HBYT-YJY-2011-JS-406) |
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| Characteristics and Controlling Factors of the Palaeozoic Reservoir Development in the Multi-lithologic Buried-hills of Erlian Basin, Inner Mongolia |
| The lithology of Palaeozoic buried-hills is variable in Erlian Basin. With core, indoor rock identification and casting thin section analysis, physical analysis, conventional logging, natural gamma ray spectrometry logging and other methods, the authors compared and analyzed characteristics of multi-lithologic buried-hills of Palaeozoic reservoirs in Erlian Basin in such aspects as pore type, property and reservoir vertical distribution. The results show that limestone buried-hills, tuff buried-hills and dynamometamorphic rock buried-hills reservoirs are well-developed and are mainly of dissolution type. The style of pore-fracture combination can be divided into cavern type, cavity-fracture type, pore-fracture type and fracture-pore type. Granite buried-hills and regional metamorphite buried-hills reservoirs are poor-developed and their storage space is structural fracture. The style of pore-fracture combination can be divided into fracture and fracture-pore type. The distribution of multi-lithologic reservoirs is characterized by vertical zonation. The reservoirs dominantly develop karst zone, weathering and leaching zone, strong weathering debris zone and interior dissolution zone. Limestone buried-hills and tuff buried-hills reservoirs have wide vertical distribution and are characterized by vertical stochastic development. Granite and granitic-cataclasite buried-hills develop weathering crust and interior reservoirs. According to comprehensive analysis, the main controlling factors of buried-hill reservoir development include lithology, the distance to the top of buried-hill, structural movement, fault distribution and hydrothermal activity. Reservoirs of different lithologic characters are mainly distributed in the depth range of 80 m to the top of the buried-hill. Fracture zones are distributed in banded form along faults, and the value of fractal dimensions gradually decreases with the increase of the distance to the fault. Hydrothermal activity played both improvement and destruction roles in the development of reservoir properties. |
| LI Hao,GAO Xian-zhi,YANG De-xiang,BAI Fan,CHEN Ya-qing,WANG Hui-lai.2013.Characteristics and Controlling Factors of the Palaeozoic Reservoir Development in the Multi-lithologic Buried-hills of Erlian Basin, Inner Mongolia[J].Acta Geoscientica Sinica,34(3):325-337. |
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