Effect of Micro-Pore Structure Parameter on Seepage Characteristics in Ultra-Low&nbsp; Permeability Reservoir: A Case from Chang6 Reservoir of Ordos Basin

HE  Wen-Xiang, YANG  Le, MA  Chao-Ya, GUO  Wei

doi:10.11764/j.issn.1672-1926.2011.03.477

2011 , Vol. 22 >Issue 3: 477 - 481,517

DOI: https://doi.org/10.11764/j.issn.1672-1926.2011.03.477

Effect of Micro-Pore Structure Parameter on Seepage Characteristics in Ultra-Low Permeability Reservoir: A Case from Chang6 Reservoir of Ordos Basin

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1.Department of Geochemistry,Yangtze University,Jingzhou 434023,China;
2.Key Laboratory of Exploration Technologies for Oil and Gas Resources,Yangtze University,
Jingzhou 434023,China; 3.No.7 Production Plant,Changqing Oilfield Company,Wuqi 717606,China;
4.Research Institute of Exploration and Development of Changqing Oil Field,Xi′an 710018,China

Received date: 2010-11-17

Revised date: 2011-01-28

Online published: 2011-06-10

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Abstract

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.

Key words： Ordos basin; Ultra-low permeability reservoir; Micro-pore structure; Capillary pressure; Seepage

Cite this article

HE Wen-Xiang, YANG Le, MA Chao-Ya, GUO Wei . Effect of Micro-Pore Structure Parameter on Seepage Characteristics in Ultra-Low Permeability Reservoir: A Case from Chang6 Reservoir of Ordos Basin[J]. Natural Gas Geoscience, 2011 , 22(3) : 477 -481,517 . DOI: 10.11764/j.issn.1672-1926.2011.03.477

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