致密砂岩储集空间多尺度表征——以松辽盆地齐家地区高台子油层为例

doi:10.11743/ogg20160613

Abstract

Abstract: Comprehensive analyses are conducted to characterize the Gaotaizi tight reservoir in Qijia area from macroscopic and microscopic perspectives,through Nano Micron CT,automatic mineral identification system (QEMSCAN),MAPS image mosaic technology,and environmental scanning electron microscopy (ESEM).From the macroscopic perspective,lithologies are mainly siltstone and argillaceous siltstone.The sedimentary bedding structures are diversified-massive bedding are the majority but cross-bedding,wedge bedding and lenticular bedding are also present.The obvious sand-shale interlayer and complicated sedimentary beddings commonly contribute to the heterogeneity of the tight reservoirs,even though the massive bedding is the most favorable for the enrichment of tight oil.The microscopic perspective reveals more interesting characteristics.Pores are continuously distributed in the micro to nano meter level,with the peak of micro pore sizes concentrated in the range of 2-3 μm,and that of nano pores around 200-300 nm.Microscopic heterogeneity can be obviously displayed in the pore-throat spatial distribution and connectivity features of different 3D modeling areas.The main pore spaces are intergranular dissolved pore,intragranular dissolved pore and micro cracks.Moreover,high porosity generally corresponds to high concentration of organic acids,indicating the controlling of porosity by dissolution.

Key words: nano pore-throat, micro pore-throat, microscopic heterogeneity, tight sandstone, Qijia area, Songliao Basin

CLC Number:

TE122.2

Li Yilin, Zhang Yunfeng, Yin Shuli, Cong Lin, Yan Ming, Tian Xiaoxiong. Characterization of the pore space in tight sandstone reservoirs from macroscopic and microscopic perspectives: A case study of Gaotaizi reservoir in Qijia area,the Songliao Basin[J]. Oil & Gas Geology, 2016, 37(6): 915-922.

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Characterization of the pore space in tight sandstone reservoirs from macroscopic and microscopic perspectives: A case study of Gaotaizi reservoir in Qijia area,the Songliao Basin

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