收稿日期: 2010-11-17
修回日期: 2011-01-28
网络出版日期: 2011-06-10
基金资助
国家科技重大专项课题“大型油气田及煤层气开发”(编号：2008ZX05023-001)资助
Effect of Micro-Pore Structure Parameter on Seepage Characteristics in Ultra-Low Permeability Reservoir: A Case from Chang6 Reservoir of Ordos Basin
Received date: 2010-11-17
Revised date: 2011-01-28
Online published: 2011-06-10
通过压汞和渗流实验对鄂尔多斯盆地长6特低渗透储层岩心进行了孔喉结构和渗流实验研究。压汞实验表明，研究区曲线类型总体上属于B类和C类；曲线偏向图的右上方分布，中间过渡段相对较陡，进汞曲线和退汞曲线夹角较小；门槛压力和中值压力高，分选性一般；孔喉半径对渗透率的贡献由单一区域向多区域均有分布；门槛压力、中值压力等与渗透率具有良好的相关关系，但退汞效率和退汞饱和度与渗透率相关性较差。单相渗流实验表明，部分样品在低压力梯度时具有非达西渗流特征，并过渡为达西渗流；两相渗流实验结果表明，储层具有高束缚水饱和度、高残余油饱和度，两相共渗区较窄的特征。
何文祥, 杨乐, 马超亚, 郭玮 . 特低渗透储层微观孔隙结构参数对渗流行为的影响——以鄂尔多斯盆地长6储层为例[J]. 天然气地球科学, 2011 , 22(3) : 477 -481,517 . DOI: 10.11764/j.issn.1672-1926.2011.03.477
Based on mercury pressure and seepage experiments for the Chang6 reservoir rock with the ultra-low permeability in the Ordos basin,we discuss the pore\|throat structure and seepage. Results of the mercury pressure experiments indicate that the capillary pressure curve is composed of B and C types. They are distributed in the up-right direction of typical patterns,with a higher pitch of parallel reach and a low angle between mercury-injection curve and mercury-ejection curve. Mercury pressure vaulues for threshold pressure and middle pressure are high,suggesting moderate grain sorting. The contribution of pore-throat structure to permeability exists both single and several areas. There is a good correlations among permeability,threshold pressure value,and middle pressure value,but a weak correlation among permeability,mercury-ejection efficiency,and mercury\|ejection saturation occurs.The single phase experiment indicates that non-darcy seepage for few samples exist when pressure gradient is low and change into darcy flow at high pressure. Two-phase experiment suggests that the reservoirs would have the high saturation of absorbing water and residual oil,associated with the small seepage areas both water and oil phase.
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