储层孔隙结构与水驱油微观渗流特征-以安塞油田王窑区长6油层组为例

doi:10.11743/ogg20110620

Abstract

Abstract:

The real sandstone micromodel was used to perform an experiment of microscopic waterflooding in Chang-6 reservoir with low permeability in Ansai oilfield, Ordos Basin. Based on the experiment and the in-depth analysis of thin section observation, physical property,SEM,relative permeability and mercury injection data,we studied the relationship between pore structure and micro-flow characteristics of waterflooding, which provide a scientific basis for effective oil exploitation in the future. The study shows that the lithology of reservoir is mainly fine-grained arkose with low compositional maturity; there are three major pore types including resid- ual intergranular pore, dissolved pore and dual pore+fracture, of which the residual intergranular pore is dom- inant; Dissolved pore and fracture are the key factors influencing the micro-heterogeneity. The experiment results indicate that there are homogeneous, reticular and finger-like micro-flows. Pore structure is closely related with micro-flow features. Reservoirs with different pore types show different micro-flow features. Flow paths of injected water depend on the relative permeability of pores and fractures in zones with well-developed fractures. Pore structure heterogeneity and wettability are the two main factors influencing displacement efficiency.

Key words: pore structure, waterflooding, percolation characteristics, Ansai oilfield, Ordos Basin

CLC Number:

TE122.2

Quan Honghui, Zhu Yushuang, Zhang Hongjun, Li Li, Shao Fei, Zhang Zhang. Reservoir pore structure and micro-flow characteristics of waterflooding: a case study from Chang-6 reservoir of Wangyao block in Ansai oilfield[J]. Oil & Gas Geology, 2011, 32(6): 952-960.

References

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Reservoir pore structure and micro-flow characteristics of waterflooding: a case study from Chang-6 reservoir of Wangyao block in Ansai oilfield

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