西南石油大学学报（自然科学版）2025，Vol.47Issue(4)：23-40,18.DOI:10.11885/j.issn.1674-5086.2024.01.11.02
川东南奥陶—志留纪之交全频斑脱岩特征及页岩气指示意义
Characteristics of Full-frequency Bentonite of Ordovician-Silurian Transition in Southeastern Sichuan and Its Significance Indicator of Shale Gas
李博硕 1单长安 1梁兴 2顾小敏 2何方雨 2石海龙2
作者信息
- 1. 西安石油大学地球科学与工程学院,陕西西安 710065||西安石油大学陕西省油气成藏地质学重点实验室,陕西西安 710065
- 2. 中国石油浙江油田公司,浙江 杭州 311100
- 折叠
摘要
Abstract
In the shale of the Wufeng-Longmaxi Formation in the southeastern Sichuan Basin,there are several sets of bentonite beds,which keeps records of key information about numerous geological events.In order to clarify the characteristics of bentonite development and its significance for shale gas,core observation,thin section identification,SEM observation,whole rock X-ray diffraction have been carried out for the core of several shale gas evaluation exploration wells and typical sections in neighboring areas in southeastern Sichuan,and the following results have been obtained.1)In the standard well of bentonite in southeastern Sichuan Province,59 bentonite layers are identified,and were further divided into 6 sets of bentonite development segments.2)In the process of volcanic ash deposition,the alkaline water environment chemically destroys the hard protein structure of graptolite,resulting in the phenomenon that graptolite does not develop in the surrounding rocks above and below the bentonite.3)There are alteration phenomena in the bentonite,and the products are mostly pyrite.4)Low-frequency and high-intensity development of bentonite often indicate high-quality shale,and high-frequency and high-intensity,high-frequency and low-intensity development of bentonite often indicate subprime-quality shale,while low frequency and low intensity development of bentonite is regarded as ordinary organic shale.关键词
川东南地区/五峰组—龙马溪组/斑脱岩/蚀变现象/页岩气意义Key words
southeastern Sichuan Basin/Wufeng-Longmaxi Formation/bentonite/alteration occurs/significance for shale gas分类
能源科技引用本文复制引用
李博硕,单长安,梁兴,顾小敏,何方雨,石海龙..川东南奥陶—志留纪之交全频斑脱岩特征及页岩气指示意义[J].西南石油大学学报（自然科学版）,2025,47(4):23-40,18.
