Characteristics and Controlling Factors of the Palaeozoic Reservoir Development in the Multi-Lithologic Buried-Hills of Erlian Basin, Inner Mongolia

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Characteristics and Controlling Factors of the Palaeozoic Reservoir Development in the Multi-Lithologic Buried-Hills of Erlian Basin, Inner Mongolia

详细信息

责任者：Li Hao (College of Geosciences ; China University of Petroleum ; Beijing 102249 ; China) ; Gao Xianzhi
刊名：Acta Geoscientica Sinica
出版年：2013
卷期：14(3)
关键词：储层性质 ; reservoir properties ; 二连盆地 ; Erlian Basin
页码：p.325-337
图表：illus., 1 plate, 1 table, 28 refs.
分类号：1003
issnNo：ISSN1006-3021
isbnNo：CN11-3474/P

摘要

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-lithologicreservoirs 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.