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

作　　者：姚梦麟 陶云贺 贺洪举 侯克均 刘海军 熊宇 张冲[4] YAO Menglin;TAO Yunhe;HE Hongju;HOU Kejun;LIU Haijun;XIONG Yu;ZHANG Chong(CCDC External Cooperation&Department,Chengdu 610051,China;Southwest Branch,China National Logging Corporation,Chongqing 400021,China;PetroChina Southwest Oil&Gasfield Company,Chengdu 610051,China;Geophysics and Oil Resource Institute,Yangtze University,Wuhan 430100,China)

机构地区：[1]川庆钻探工程有限公司对外合作和市场开发处,成都610051 [2]中国石油集团测井有限公司西南分公司,重庆400021 [3]中石油西南油气田开发事业部,成都610051 [4]长江大学地球物理与石油资源学院,武汉430100

出　　处：《地质科技通报》2025年第2期214-223,共10页Bulletin of Geological Science and Technology

基　　金：国家自然科学基金项目(41404084)。

摘　　要：粒度分析可以判别地层沉积环境和评价储层渗透性,对碎屑岩油气储层评价十分重要。以四川盆地天府气田沙溪庙组致密砂岩储层为研究对象,分析了碎屑岩颗粒大小和形状对储层渗透性的影响,结合粒度中值M、粒度C值、分选系数等参数,提出了一个综合表征粒度的指示参数PI,对颗粒粒度比较敏感的测井参数自然伽马、光电吸收截面指数和中子进行主成分分析,降维成一个主成分参数,建立了粒度指示参数PI与主成分参数的指数关系模型,结合测试及测井资料,分析了粒度指示参数PI与储层产能的相关关系。统计了天府气田沙溪庙组7口井8个测试气层段,并通过上述方法计算了7口井的粒度指示参数PI值,分析了测试段无阻流量与粒度指示参数PI的响应关系。结果显示:天府气田沙溪庙组测试段无阻流量与粒度指示参数PI的累加值X呈指数关系,其相关系数R^(2)达到0.85。研究说明:对于岩性以中-细粒砂岩为主,粒级变化大,且储集空间以残余粒间孔为主的储层,粒度指示参数PI在一定程度上可以指示该种类型储层的产能大小。[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 

分 类 号：P618.13[天文地球—矿床学]