地质科技通报2025，Vol.44Issue(2)：214-223,10.DOI:10.19509/j.cnki.dzkq.tb20230582
致密砂岩碎屑颗粒粒度定量表征及对产能的指示意义
Quantitative characterization of the clastic particle size of tight sandstone and its indicative significance for productivity
摘要
Abstract
[Objective]Particle size analysis is important for the evaluation of clastic petroleum reservoirs because it can identify the stratigraphic depositional environment and assess the permeability of reservoirs.[Methods]Using the dense sandstone reservoir of the Shaximiao Formation in the Tianfu Gas Field in the Sichuan Basin as the research object,we first analyzed the influence of the particle size and shape on the permeability of the clastic rock reservoir.Next,we combined the median and C values of the particle size and the sorting coefficient to perform a comprehensive characterization of the particle size indicator parameter(PI).Additionally,we carried out a principal component analysis on the natural gamma-ray logging value,photoelectric absorption cross-section index,and neutron porosity,which are more sensitive to particle size.An exponential relationship model between the PI and the principal component parameter was established.Finally,the correlation between PI and reservoir production capacity was analyzed by combining the Oil test and logging data.[Results]The statistics of 8 test gas sections from 7 wells in the Shaximiao Formation of Tianfu Gas Field were collected,and the PI values of 7 wells were calculated using the above method.The response relationship between the unimpeded flow rate and the PI was analyzed in the test sections,and the results revealed that the unimpeded flow rate and the cumulative PI values in the Shaximiao Formation exhibited an exponential relationship,with a correlation coefficient of 0.85.[Conclusion]This study reveals that,for reservoirs whose lithology is dominated by medium-to fine-grained sandstone,with large variations in grain size,and with storage space dominated by residual intergranular pores,the PI can,to some extent,serve as an indicator of the production capacity of this type of reservoir.关键词
粒度指示参数PI/粒度分析/测井表征/产能/沙溪庙组/四川盆地天府气田/致密砂岩/碎屑颗粒Key words
particle size parameter/particle size analysis/well log/productivity/Shaximiao Formation/Tianfu gas field in the Sichuan Basin/tight sandstone/clastic particle分类
地质学引用本文复制引用
姚梦麟,陶云贺,贺洪举,侯克均,刘海军,熊宇,张冲..致密砂岩碎屑颗粒粒度定量表征及对产能的指示意义[J].地质科技通报,2025,44(2):214-223,10.基金项目
国家自然科学基金项目(41404084) （41404084）
