川东二叠系龙潭组不同沉积环境下的页岩弹性波速度特征  

Elastic wave velocity characteristics of shale in different sedimentary environments of Permian Longtan Formation in Eastern Sichuan Basin

作　　者：王艳[1] 张兵[1] 姚永君 林晓杨 曹高权 肖威 WANG Yan;ZHANG Bing;YAO Yongjun;LIN Xiaoyang;CAO Gaoquan;XIAO Wei(Earth Exploration and Information Technology Key Laboratory of Ministry of Education,Chengdu University of Technology,Chengdu 610059,China;Chongqing Gas Mine,PetroChina Southwest Oil and Gas Field Branch,Chongqing 400000,China)

机构地区：[1]成都理工大学“地球勘探与信息技术”教育部重点实验室,成都610059 [2]中国石油西南油气田分公司重庆气矿,重庆400000

出　　处：《物探化探计算技术》2024年第2期180-189,共10页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：国家自然科学基金(42272184)。

摘　　要：笔者选取川东地区FT1井龙潭组页岩进行实验测试,在岩相划分的背景下,通过主微量元素研究川东龙潭组不同岩相的沉积环境,结合沉积环境对石英成因、TOC的影响,探讨不同沉积环境下的弹性波速度变化特征。研究结果表明:①混合质页岩和黏土质页岩处于低古生产力、富氧、陆源碎屑输入较高的沉积环境,其石英以陆源碎屑石英为主,TOC含量偏低;硅质页岩处于高古生产力、缺氧、陆源碎屑输入较低的沉积环境,其石英以生物成因石英为主,TOC含量较高。②混合质页岩和黏土质页岩以黏土颗粒作为岩石骨架,弹性波速度较低,且弹性波速度随石英含量呈上升趋势;硅质页岩以石英颗粒作为岩石骨架,弹性波速度较高,且弹性波速度随石英含量呈下降趋势。研究结果可为龙潭组页岩优势岩相勘探提供依据。This paper selects the shale of Longtan Formation in Well FT1 in eastern Sichuan Basin for experimental test.Under the background of lithofacies division,the sedimentary environment of different lithofacies in the Longtan Formation in the eastern Sichuan Basin is analyzed using data from primary and trace elements.Combined with the influence of sedimentary environment on quartz genesis and TOC,the variation characteristics of elastic wave velocity in different sedimentary environments are discussed.The results show that:①The mixed shale and clay shale are in a sedimentary environment with low paleoproductivity,rich oxygen,and high input of terrigenous debris.Siliceous shale is in a sedimentary environment with high paleoproductivity,poor oxygen,and low terrigenous debris input.Its quartz is mainly biogenic quartz with high TOC content.②Mixed shale and argillaceous shale use clay particles as rock skeleton;the elastic wave velocity is low,and the elastic wave velocity increases with quartz content.The siliceous shale takes quartz particles as the rock skeleton,and the elastic wave velocity is high,and the elastic wave velocity decreases with the quartz content.The research results can provide a basis for exploring dominant lithofacies in Longtan Formation shale.

关 键 词：龙潭组 沉积环境 石英成因 TOC 弹性波速度 

分 类 号：P618.13[天文地球—矿床学]