Tight sandstone reservoirs characterization of Chang 7 member in Longdong area,Ordos Basin

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  • 1.Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China;
    2.Exploration and Development Institute of Changqing Oilfield Company,CNPC,Xi’an 710018,China

Received date: 2015-07-21

  Revised date: 2015-12-08

  Online published: 2019-09-20

Abstract

Tight sandstone reservoirs develop extensively in Chang 7 member in Longdong area,Ordos Basin,and tight oil is abundant.Unconventional tight sandstone reservoirs need special experimental techniques and analytical methods,which is different from the conventional reservoirs of high porosity and permeability.This paper adopted tight rock analysis,NMR,core and thin section observation,and FMI materials,in order to characterize the reservoirs precisely.The results of the experiments show that: (1)Destructive diagenesis is very strong,and effective porosity,bounded hydrocarbons (% of BV) decrease with depth;(2)According to the centrifugal experiment,this paper sets 0.1μm as the lower limit of pore throat of tight sandstone reservoirs,which is consistent with high pressure mercury data;(3)The movable fluid saturation is high and the correlation between movable fluid saturation and porosity and permeability is poor.The micro-cracks develop widely and they greatly improve the oil and gas migration and accumulation capacity.

Cite this article

Han Wen-xue, Tao Shi-zhen, Yao Jing-li, Ma Wei-jiao . Tight sandstone reservoirs characterization of Chang 7 member in Longdong area,Ordos Basin[J]. Natural Gas Geoscience, 2016 , 27(5) : 820 -826 . DOI: 10.11764/j.issn.1672-1926.2016.05.0820

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