付博烨^1,2,4,,
符力耘^3,,,
曹呈浩^1,2,
韩同城³
1. 中国科学院油气资源研究重点实验室, 中国科学院地质与地球物理研究所, 北京 100029
2. 中国科学院地球科学研究院, 北京 100029
3. 中国石油大学(华东)深层油气重点实验室, 青岛 266580
4. 中国科学院大学, 北京 100049

基金项目: 国家科技重大专项课题"页岩气勘探地球物理技术研究"（2017ZX05036-005）和中国科学院战略性先导科技专项（B类）（XDB10010401）联合资助


详细信息

作者简介: 付博烨, 男, 1991年生, 博士研究生, 2014年获中国地质大学(北京)地质学(地质地球物理复合)专业学士学位, 现于中国科学院地质与地球物理研究所攻读固体地球物理学专业博士学位, 主要从事岩石物理、声弹性理论方面的研究.E-mail:fuboye@mail.iggcas.ac.cn

通讯作者: 符力耘, 男, 1964年生, 教授, 博士生导师, 主要从事岩石物理、地震成像等相关领域研究工作和教学.E-mail:lfu@mail.iggcas.ac.cn

中图分类号: P631

收稿日期:2019-04-06
修回日期:2020-05-11
上线日期:2020-07-25

The analysis of the influence of organic content on the elastic properties of shale based on solid substitution model

FU BoYe^1,2,4,,
FU LiYun^3,,,
CAO ChengHao^1,2,
HAN TongCheng³
1. Key Laboratory of Petroleum Resource Research, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
2. Institutions of Earth Science, Chinese Academy of Sciences, Beijing 100029, China
3. Key Laboratory of Deep Oil and Gas(China University of Petroleum(East China)), Qingdao 266580, China
4. University of Chinese Academy of Sciences, Beijing 100049, China


More Information

Corresponding author: FU LiYun,E-mail:lfu@mail.iggcas.ac.cn

MSC: P631

--> Received Date: 06 April 2019
Revised Date: 11 May 2020
Available Online: 25 July 2020


摘要
摘要:页岩中的TOC（Total Organic Carbon，总有机碳）含量，对页岩的有效弹性模量以及与之相关的弹性波速度（P波和S波）有重要影响，建立弹性模量与TOC含量关系是页岩气甜点预测的重要手段之一.C&S和S&M两种固体置换理论主要针对孔隙度较大的砂岩，能否适用于孔隙度低、孔隙形态复杂和非均质性强的页岩目前尚未深入研究.鉴于目前已知的富有机质页岩的TOC赋存形态与裂缝以及孔隙形态类似，有关TOC含量对岩石弹性模量的影响可视为孔隙物质充填问题来研究.本文利用数字岩心技术，构造同一数字岩心不同TOC含量的样本群，基于C&S和S&M两种固体替换理论模型，通过有限元（FEM）数值模拟交叉验证，详细研究了两种固体替换方程对页岩的适用性和TOC含量对页岩弹性性质的影响.研究表明，由于实际岩心孔隙及TOC分布的非均质性，C&S替换方程弹性模量预测值与FEM模拟结果存在差异，而S&M替换方程预测值与FEM模拟结果基本一致，两种方程的预测差异揭示页岩非均质强度，利用S&M替换方程中的参数α₁，α₂，β₁和β₂可详细分析实际岩心孔隙及TOC分布的非均质特征.
关键词: 龙马溪组页岩/
固体替换/
页岩非均质性分析/
页岩数字岩心

Abstract:The elastic moduli and the elastic wave velocities related to the elastic moduli are influenced by the fraction of TOC in shales. Therefore, the relation between the elastic moduli and the fraction of TOC in rocks, in turn, can be served as a method to explore the shale gas sweet spot. C&S and S&M substitution equations are mainly focused on the solid substitution problem for sandstones with large porosity. Whether the C&S and S&M substitution equation can be used to solve the solid substitution problem for shale with low porosity, complex pore structure and high heterogeneity is not researched deeply until now. Because the TOC shape in organic-rich shale is similar to shale pore and crack structure, the influence of the TOC content on the elastic moduli of shale can be regarded as a kind of solid substitution problem. In this research, we constructed a group of digital rock cores with different TOC content, and based on C&S and S&M solid substitution equations and FEM simulation researched the application of the two substitution equations, and the influence of TOC contents on the elastic properties of shale. It is shown that because of the heterogeneity of the distribution of pore and TOC in shales, there is error between the result of C&S equation and FEM simulation. However, the result of S&M equation is consistent with the result of FEM simulation. The difference between the results of C&S and S&M equations indicate the heterogeneity of the shales. The parameters α₁ , α₂, β₁ and β₂ in S&M equation can be served as the parameters representing the heterogeneity of the distribution of pore and TOC in shales.
Key words:Longmaxi Formation shale/
Solid substitution/
Heterogeneity analysis of shale/
Digital shale cores



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