黔西盘关向斜两翼现今地应力差异及影响因素分析
Analysis of Present-day In-situ Stress Difference and Its Influencing Factors Between Two Limbs of Panguan Syncline in Western Guizhou Region
赵习龙 1鞠玮 1杨兆彪 1王胜宇2
作者信息
- 1. 煤层气资源与成藏过程教育部重点实验室,江苏徐州 221008;中国矿业大学资源与地球科学学院,江苏徐州 221116
- 2. 中国矿业大学资源与地球科学学院,江苏徐州 221116
- 折叠
摘要
现今地应力发育特征与分布规律对煤层气高效勘探和开发具有重要指导意义,而断层、褶皱等构造对地应力分布具有显著控制作用,即便在同一褶皱内,不同部位的现今地应力也可能存在差异.以黔西盘关向斜为例,首先基于注入/压降试井数据,计算获取实测点地应力大小;然后利用测井资料,结合修正Anderson模型,计算获取盘关向斜两翼地层现今地应力大小及分布,查明盘关向斜不同部位地应力的差异性,并重点分析了地质构造与岩石力学参数对盘关向斜两翼现今地应力的控制作用.结果表明,区域地应力大小与地层弹性模量具有正相关性,与断层数量及规模呈现负相关关系.在相同深度下,储层现今地应力越大,渗透率越低,正断型应力机制影响下的煤层渗透性较逆断型的好.研究成果可以为盘关向斜煤层气勘探和开发提供基础地质参数.
Abstract
The development characteristics and distribution pattern of present-day in-situ stress indicate important guiding significance for efficient coalbed methane development.Faults,folds and other structures can significantly influence and control the distribution of in-situ stress.The present-day in-situ stress field may also vary within different parts of a single fold.In this study,the Panguan syncline in western Guizhou was taken as an example.Firstly,based on the injection/falloff well test data,the present-day in-situ stresses at different measured points were calculated.Then,based on logging data and the modified Anderson model,the magnitudes of present-day in-situ stress in two wings of Panguan syncline are calculated to release in-situ stress difference in different parts of Panguan syncline.In addition,the effects of geological structure and rock mechanics parameters on the in-situ stress difference between the two wings of Panguan syncline are comprehensively analyzed.It is found that the regional in-situ stress is positively correlated with rock Young's moduli,and negatively correlated with the number and scale of faults within the study area.At the same burial depth,the larger in the in-situ stress magnitude,the lower the permeability.The in-situ stress mechanism affects the permeability as well.The normal faulting stress mechanism is much more favorable to permeability improvement than the reverse faulting stress mechanism.The research results can provide basic geological parameters for the exploration and development of coalbed methane in the Panguan syncline.
关键词
现今地应力/影响因素/盘关向斜/渗透率/黔西地区Key words
present-day in-situ stress/influencing factors/Panguan syncline/coal permeability/western Guizhou region引用本文复制引用
基金项目
国家自然科学基金面上项目(42372185)
国家自然科学基金重点项目(42130802)
出版年
2024
NETL
NSTL
万方数据