基于统计学页岩脆性矿物定量界定及评价——以四川盆地及其周缘五峰—龙马溪组页岩为例  

Quantitative Definition and Evaluation of Brittle Minerals in Shale Based on Statistics:Taking Shale of Wufeng-Longmaxi Formation in Sichuan Basin and Its Peripheral Area as an Example

作　　者：何翔 李群[1,2,3] HE Xiang;LI Qun(School of Geosciences and Info-Physics,Central South University,Changsha,Hunan 410083,China;Key Laboratory of MOE for Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring,Central South University,Changsha,Hunan 410083,China;Key Laboratory of Hunan Province for Exploration of Nonferrous Resources and Geological Hazards,Central South University,Changsha,Hunan 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院,湖南长沙410083 [2]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083 [3]中南大学有色资源与地质灾害探查湖南省重点实验室,湖南长沙410083

出　　处：《西安石油大学学报（自然科学版）》2020年第2期42-49,共8页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中国石化股份公司科研项目"焦石坝上部气层开发评价技术"(ZKK0217002)。

摘　　要：根据四川盆地10口钻井的矿物组分数据,采用系统聚类分析方法,提出页岩脆性评价公式,定量界定页岩中有效脆性矿物组分和非有效脆性矿物组分,并探究了其结果同目前常用矿物组分法评价结果的关系。系统聚类分析的方法能定量界定页岩矿物组分中的有效脆性矿物和非有效脆性矿物,用本文页岩脆性指数计算公式对页岩脆性进行评价,其结果同常用的矿物组分法计算结果能较稳定地对照,对不同的有效脆性矿物组合的评价,前者比后者大0~17%。页岩脆性随深度增大而增强,且页岩采样层段的均质性越好、石英和黏土矿物含量的变化趋势越稳定,页岩脆性指数变化趋势就越稳定。A evaluation formula of shale brittleness is put forward by using the systematic cluster analysis method based on the mineral component data of 10 wells in Sichuan Basin.The effective and non effective brittle mineral components in shale are defined quantitatively,and the evaluation results of the method are compared with those of common mineral component method.It is shown that the method of systematic cluster analysis can quantitatively define the effective brittle minerals and non effective brittle minerals in shale.The shale brittleness index calculated by the formula in this paper is basically the same as that calculated by the commonly used mineral composition formula.For the shale with different effective brittle mineral combinations,the brittleness index calculated by the new formula is 0~17%larger than that calculated by the commonly used formula.The brittleness of shale increases with the increase of depth,and the better the homogeneity of shale sampling segment and the more stable the content of quartz and clay mineral,the more stable the shale brittleness index.

关 键 词：页岩脆性 矿物组分 四川盆地 

分 类 号：TE121[石油与天然气工程—油气勘探]