中国含煤盆地浅—中深部现今地应力特点和分布规律  

Characteristics and distribution of current in-situ stress at shallow—medium depth in coal-bearing basins in China

作　　者：文卓 康永尚[1,2] 邓泽[3] 孙良忠[1] 李贵中[3] 王红岩[3] WEN Zhuo;KANG Yongshang;DENG Ze;SUN Liangzhong;LI Guizhong;WANG Hongyan(College of Geosciences,China University of Petroleum(Beijing,Beijing,102249;State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing, Beijing, 102249;PetroChina Exploration and Development Research Institute, Beijing,100083)

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249 [2]油气资源与探测国家重点实验室,北京102249 [3]中石油勘探开发研究院,北京100083

出　　处：《地质论评》2019年第3期729-742,共14页Geological Review

基　　金：国家重大专项(编号:2016ZX05041-001)的成果~~

摘　　要：在煤炭开采和煤层气勘探开发过程以及其他地质工程活动中,现今地应力是一个不可忽略的地质因素。本文收集和估算了中国六个不同含煤盆地1300 m以浅的现今地应力数据,对中国含煤盆地的浅—中深部的地应力特点和地应力分布规律展开研究。研究表明:①东部地区走滑应力场(σ_H>σ_V>σ_h)占比高,向西北地区逐渐降低;中—高应力场占比在中国各含煤盆地差异比较小;②地应力场类型和地应力量级与埋深有关,随着中国含煤盆地开采深度的增加,正常应力场(σ_V>σ_H>σ_h)逐渐占据主导作用,地应力量级也逐渐加大;③通过侧压系数对比,将现今中国含煤盆地浅—中深部地应力强度分为:东北地区高应力区、两淮地区中—高应力区、滇东黔西和沁水盆地中应力区以及鄂尔多斯盆地(东缘)和准噶尔盆地(南部)低应力区;④板块俯冲形成了中国含煤盆地地应力强度东强西弱的分布格局,南北走向的吕梁山是中国北部东西应力强度的分界线;⑤地应力强度向着远离应力源的方向减弱,这种变化规律在中国大陆以及在某个应力分区内(如在沁水盆地和滇东黔西地区)皆有表现。Objectives: In the process of coal mining and coalbed methane exploration and development,Current in-situ stress is a non-negligible geological factor. This paper mainly studies the current in-situ stress characteristics and distribution of coal reservoirs above depth of 1,300 meters in the shallow part of China’s coal-bearing basins.Methods: Based on the current in-situ stress data of 26 coal mines or coalbed methane blocks,the in-situ stress and lateral pressure coefficients of different regions were compared and analyzed. The current in-situ stress characteristics and distribution of different coal-bearing basins were summarized.Results: The study shows that the proportion of strike-slip stress field(σ_H>σ_V>σ_h) in the eastern region is high,and gradually decreases to the northwest regions;The difference of proportion of medium-high stress field in China’s coal-bearing basins is relatively small. The current in-situ stress field and the magnitude of the current insitu stress are related to the buried depth. With the increase of the mining depth of coal-bearing basins in China,the normal stress field(σ_V>σ_H>σ_h) gradually takes the leading role,and the magnitude of the in-situ stress also gradually increases. The current in-situ stress intensity of China’s coal-bearing basins is divided by the comparison of lateral pressure coefficient: the northeast region is a high stress area;the Lianghuai is a medium-high stress area;the Eastern Yunnan-Western Guizhou and the Qinshui basin are medium-stress areas;Ordos Basin( East edge) and Junggar Basin( South) are low stress areas. The subduction of the plate formed the distribution pattern of the current in-situ stress intensity in the coal-bearing basins in China,which is strong in the east and weak in the west. The Luliang Mountain in the north-south direction is the boundary between the east and west stress intensity in northern China. The in-situ stress intensity weakens toward the direction away from the source of force. This change law is significant

关 键 词：含煤盆地 地应力特点 地应力强度 分布规律 

分 类 号：P618.13[天文地球—矿床学]