微CT扫描重建低渗气藏微观孔隙结构--以新场气田上沙溪庙组储层为例

doi:10.11743/ogg20110519

Abstract

Abstract:

In order to enhance gas recovery,it is necessary to construct pore network model and quantitatively describe micro-pore-scale percolation mechanism based on micro-pore structure.Taking cores of the Upper Sha-ximiao Formation in the Xinchang gas field of western Sichuan Basin as an example,this paper studies 3D reconstruction of pore structure.First,using micro-CT to scan core to get projection data,and using the FDK algorithm for construction of grayscale images.Then based on experimental porosity,using 2-value segmentation to cut grayscale images and using ray tracing algorithm to get 3D pore structure image(digital core).Statistical analysis of the properties of digital core shows that the porosity of digital core is almost identical to the measured core porosity with a relative error of only 0.1,which is in coincide with the properties of Upper Shaximiao Formation in the Xinchang gas field.It shows that reconstruction of micro pore structure with micro-CT scanning is feasible.The study provides a solid foundation for pore network modeling and subsequent microscopic flow simulation study.

Key words: resolution, 2-value segmentation, ray tracing, micro-CT, microscopic pore structure, low permeability gas pool, Xinchang gas field

CLC Number:

TE122.2

Su Na, Duan Yonggang, Yu Chunsheng. Reconstruction of microscopic pore structure in low permeability gas reservoirs by micro-CT scanning: an example from the Upper Shaximiao Formation in Xinchang gas field[J]. Oil & Gas Geology, 2011, 32(5): 792-796.

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Reconstruction of microscopic pore structure in low permeability gas reservoirs by micro-CT scanning: an example from the Upper Shaximiao Formation in Xinchang gas field

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