Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (6): 76-83.doi: 10.3969/j.issn.1673-8926.2017.06.010

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Logging evaluation for permeability of tight sandstone gas reservoirs based on flow unit classification:a case from Xujiahe Formation in Guang' an area,central Sichuan Basin

CHEN Zhiqiang1, WU Siyuan1, BAI Rong2, LEI Gang3   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China;
    3. Test Company, PetroChina Qinghai Oilfield Company, Dunhuang 736202, Gansu, China
  • Received:2017-05-13 Revised:2017-08-17 Online:2017-11-21 Published:2017-11-21

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Abstract: Strong heterogeneity exists in the tight sandstone gas reservoirs of Xujiahe Formation in Guang' an area, central Sichuan Basin, which leads to poor correlation between porosity and permeability. It is difficult to calculate the permeability directly by using a single regression model. Therefore,physical property data from 859 standard plunger cores,the reservoir was divided into five types of flow unit according to Flow Unit Index(FZI)from small to large,the corresponding regression models were established,and there was a good correlation between porosity and permeability in each type of Flow Unit. In order to make the established models for every type of flow unit available in estimating permeability in the whole intervals in field application,the consecutive FZI should be first obtained to classify formation. Therefore,20 typical samples were selected to carry out Nuclear Magnetic Resonance(NMR)and mercury injection experiment. On the basis of experiment data, conversion models between T2 geometric mean(T2 lm)and Swanson parameter, Swanson parameter and reservoir quality index (RQI),RQI and FZI were established. Models of calculating the key factor of RQI in expression of FZI estimation formula were established,and then a credible technique of extracting FZI consecutively from NMR logs was proposed, which ensures the credibility of formation classification by using the predicted FZI. Finally, continuous division of flow unit and logging evaluation for permeability of tight sandstone gas reservoirs in the study area were succeeded. Application results show that the FZI calculated by NMR log calculation is consistent with core analysis FZI, and NMR log can effectively solve the problem of continuously quantitative evaluation of FZI. Compared with single regression model and NMR Coates model,permeability value calculated by the classification of flow unit is more consistent with core analysis,this method can effectively improve the accuracy of permeability logging evaluation. This method can be used in tight gas reservoir evaluation and deliverability prediction directly.

Key words: reservoir, sequence stratigraphy, dolomitization, Feixianguan Formation, Lower Triassic, Dachuan-Wanxian area

CLC Number: 

  • P631.8
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