特低渗透砂岩储层水敏实验及损害机理研究——以鄂尔多斯盆地西峰油田延长组第8油层为例

doi:10.11743/ogg20120220

Abstract

Abstract:

Taking the eighth oil layer of Yanchang Formation in Xifeng oilfield in Ordos Basin as an example,this paper investigates reservoir characteristics through cast thin section observation,SEM,image analysis and whole rock analysis,and studies water sensitivity through core flow displacement experiment.In addition,the changes of microscopic features within cores before and after water sensitivity experiment such as clay mineral occurrence and pore structure are qualitatively and quantitatively determined by using SEM and capillary flow porometer respectively,so as to investigate the mechanism of water sensitivity.The eighth oil layer of Yanchang Formation in Xifeng oilfield is a sandstone reservoir with ultra-low permeability.Its clay minerals are dominated by kaolinite,chlorite and illite,with no montmorillonite but some mixed-layer illite/smectite(only 11.4%).The degree of water sensitivity damage is moderate to strong.The damage from expanding clays is limited.The mecha-nisms of water sensitivity damage in cores include reduction of effective throat radius caused by secondary amorphous;damage or scattering of the paragenetic structures of clay minerals;dispersion of non-expanding clay mineral assemblage and cracking of their single crystal;collapsing of structure of matrix in pores and throat-plugging caused by migration of fine particles.

Key words: water sensitivity, clay mineral, effective throat, ultra-low permeability sandstone, Xifeng oilfield, Ordos basin

CLC Number:

TE121.2

Liao Jijia, Tang Hongming, Zhu Xiaomin, Ren Mingyue, Sun Zhen, Lin Dan. Water sensitivity experiment and damage mechanism of sandstone reservoirs with ultra-low permeability:a case study of the eighth oil layer in the Yanchang Formation of Xifeng oilfield,Ordos Basin[J]. Oil & Gas Geology, 2012, 33(2): 321-328.

References

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Water sensitivity experiment and damage mechanism of sandstone reservoirs with ultra-low permeability:a case study of the eighth oil layer in the Yanchang Formation of Xifeng oilfield,Ordos Basin

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