鄂尔多斯盆地镇原地区长 8 油层组超低渗储层孔隙结构特征

doi:10.3969/j.issn.1673-8926.2014.02.003

Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (2): 15-20.doi: 10.3969/j.issn.1673-8926.2014.02.003

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Pore structure characteristics of ultra-low permeability reservoirs of Chang 8 oil reservoir set in Zhenyuan area, Ordos Basin

HU Zuowei¹， LI Yun¹， WANG Haihong²， HOU Changbing²， WANG Changyong¹， LIU Jiang¹

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation，Chengdu University of Technology， Chengdu 610059， China； 2. The Fourth Section of Ultra-low Permeability Reservoirs， PetroChina Changqing Oilfield Company， Qingyang 745100， Gansu， China

Online:2014-04-06 Published:2014-04-06

Abstract

Abstract:

As important basic data for petroleum exploration and development, the characteristics of pore structure increasingly became an indispensable part in the comprehensive evaluation and fine description of the oil and gas reservoirs. Based on the analysis of thin sections, routine physical properties and high-pressure mercury injection, this paper systematically studied the characteristics and comprehensive classification of the pore structure of the ultra-low permeability reservoirs of Chang 8 oil reservoir set in Zhenyuan area, Ordos Basin. The results show that the reservoir sandstones are characterized by feldspar and lithic-rich sandstone types, low-porosity and ultra-low permeability, microfine sizes of pore-throat radius, low capacity of oil production, not high efficiency of oil displacement, poor concentration and uniformity of pore-throat sizes, and strong differentiation between coarse-throats and fine-throats. The pore structure of reservoir sandstones can be divided into five types: good, slightly good, moderate, slightly poor and poor types. The moderate and slightly poor types are the most typical types of the pore structure.

Key words: shale oil, oil saturation index, resource potential, Jiyang Depression, Dongpu Sag, Songliao Basin

HU Zuowei， LI Yun， WANG Haihong， HOU Changbing， WANG Changyong， LIU Jiang. Pore structure characteristics of ultra-low permeability reservoirs of Chang 8 oil reservoir set in Zhenyuan area, Ordos Basin[J].Lithologic Reservoirs, 2014, 26(2): 15-20.

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