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

doi:10.11885/j.issn.1674-5086.2024.01.11.02

西南石油大学学报(自然科学版) ›› 2025, Vol. 47 ›› Issue (4): 23-40.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

李博硕^1,2, 单长安^1,2, 梁兴³, 顾小敏³, 何方雨³, 石海龙³

1. 西安石油大学地球科学与工程学院, 陕西西安 710065;
2. 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;
3 中国石油浙江油田公司, 浙江杭州 311100

收稿日期:2024-01-11 发布日期:2025-07-25
通讯作者: 单长安，E-mail:shanca@xsyu.edu.cn
作者简介:李博硕，1998年生，男，汉族，山东淄博人，博士研究生，主要从事地质事件沉积学相关研究。E-mail:liboshuo0533@163.com
单长安，1985年生，男，汉族，山东菏泽人，副教授，博士，主要从事非常规油气地质学相关研究。E-mail:shanca@xsyu.edu.cn
梁兴，1965年生，男，汉族，广西北流人，教授级高级工程师，主要从事页岩油气、煤层气和常规油气地质工程一体化综合评价、钻探工程技术研究、规划部署设计与勘探开发方面的研究。E-mail:liangx85@petrochina.com.cn
顾小敏，1995年，女，汉族，江苏南通人，硕士，主要从事油气勘探方面的研究工作。E-mail:guxm85@petrochina.com.cn
何方雨，1992年生，女，汉族，浙江杭州人，工程师，硕士，主要从事油气地质勘探方面工作。E-mail:hefy85@petrochina.com.cn
石海龙，1981年，男，汉族，甘肃庆阳人，工程师，主要从事油气勘探方面工作。E-mail:Shihailong85@petrochina.com.cn

Characteristics of Full-frequency Bentonite of Ordovician–Silurian Transition in Southeastern Sichuan and Its Significance Indicator of Shale Gas

LI Boshuo^1,2, SHAN Chang'an^1,2, LIANG Xing³, GU Xiaomin³, HE Fangyu³, SHI Hailong³

1. School of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
2. Shaanxi Key Laboratory of Petroleum Accumulation Geology, Xi'an Shiyou University, Xi'an, Shaanxi 710065, China;
3. Zhejiang Oilfield Company, PetroChina, Hangzhou, Zhejiang 311100, China

Received:2024-01-11 Published:2025-07-25

摘要/Abstract

摘要： 川东南地区五峰组—龙马溪组页岩中发育多套斑脱岩层，记录着诸多地质历史事件的关键信息。为明确斑脱岩发育特征及其对页岩气的指示意义，针对川东南地区多口页岩气井岩芯及邻区典型剖面开展了斑脱岩特征系统观察与统计，并进行了薄片鉴定、扫描电镜观察、全岩黏土X射线衍射分析等实验测试，得到以下成果： 1）川东南地区标准井共识别出斑脱岩59层，进一步划分为6套斑脱岩发育段； 2）火山灰沉积过程中碱性水体环境对笔石硬质蛋白质结构有化学性破坏，造成了斑脱岩上下围岩均不发育笔石的现象； 3）斑脱岩存在蚀变现象，产物多为黄铁矿； 4）斑脱岩低频率高强度发育往往指示着优质页岩，高频率高强度和高频率低强度发育指示着次优质页岩，低频率低强度发育则认为是普通有机质页岩。

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

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, highfrequency 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.

Key words: southeastern Sichuan Basin, Wufeng-Longmaxi Formation, bentonite, alteration occurs, significance for shale gas

中图分类号:

TE121.3

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.

LI Boshuo, SHAN Chang'an, LIANG Xing, GU Xiaomin, HE Fangyu, SHI Hailong. Characteristics of Full-frequency Bentonite of Ordovician–Silurian Transition in Southeastern Sichuan and Its Significance Indicator of Shale Gas[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(4): 23-40.

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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

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