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唐山地区3 ~ 4 km深部地应力测量及其意义
投稿时间:2020-05-09  修订日期:2020-07-10  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020266
摘要点击次数: 107
全文下载次数: 155
作者单位地址
上官拴通 河北省煤田地质局第二地质队 河北省邢台市高新区北康庄村河北煤田二队工业园
孙东生 中国地质科学院地质力学研究所 民族大学南路11号
张国斌 河北省煤田地质局第二地质队 
杨跃辉 中国地质大学(北京) 
齐晓飞 河北省煤田地质局第二地质队 
陈东方 中国地质大学北京 
乔永超 河北省煤田地质局第二地质队 
李阿伟 中国地质科学院地质力学研究所 
陈群策 中国地质科学院地质力学研究所 
基金项目:河北省重点研发计划项目(19274102D)
中文摘要:地应力大小和方向是干热岩开发中注采井网部署、水力压裂设计和诱发地震评估等方面的重要基础数据。本文利用非弹性恢复(ASR)地应力测试方法,实测获取了唐山市乐亭县马头营干热岩勘探区3 ~ 4 km深度范围的地应力状态。研究结果表明:(1)地应力量值随深度增加而加大,3139 ~ 3934 m深度范围内水平最小主应力介于59.0 ~ 90.7 MPa,水平最大主应力介于103.7 ~ 123.6 MPa。水平最大主应力方向介于N83 ~ 114°E之间。(2)三向主应力总体表现为σH>σv>σh,表明研究区3 ~ 4 km深度构造应力占主导地位,该应力状态有利于走滑断层活动。(3)利用摩尔-库伦准则对邻区断层的稳定性进行分析,结果表明研究区3 ~ 4 km深度范围内的断层总体处于稳定的应力环境;(4)干热岩注水开发与断层稳定性分析表明,在统一的区域地应力场作用下,研究区3900~4000 m干热岩注水开发过程中,当地面持续注入压力达到或超过约28 MPa时,可能引起场区内断层的滑动失稳,导致中小地震的发生,在干热岩开发利用中需注意防范。研究结果对于唐山地区地球动力学研究及干热岩的开发利用具有一定参考价值。
中文关键词:唐山地区  地应力  非弹性应变恢复法  断层活动性
 
In-situ stress measurement and its significance within the depth of 3 ~ 4 km in Tangshan area.SHANGGUAN Shuantong1, SUNDongsheng2,ZHANG Guobin1,CHEN Dongfang2,3, QIXiaofei1, YANG Yuehui2,3, QIAOYongchao1 ,LI A-wei2
Author NameAffiliationAddress
SHANGGUAN Shuantong Hebei Coalfield GeologyBureau Second Geological Team 河北省邢台市高新区北康庄村河北煤田二队工业园
Sun Dongsheng Institute of Geomechanics, CAGS 民族大学南路11号
Zhang Guobin Hebei Coalfield GeologyBureau Second Geological Team 
YANG Yuehui China University of Geosciences 
QIXiaofei Hebei Coalfield GeologyBureau Second Geological Team 
Chen Dongfang China University of Geosciences 
Qiao Yongchao Hebei Coalfield GeologyBureau Second Geological Team 
LI Awei Institute of Geomechanics, Chinese Academy of Geological Sciences 
Chen Qunce Institute of Geomechanics, Chinese Academy of Geological Sciences 
Abstract:The magnitude and direction of in-situ stress are important parameters in the deployment of injection production well pattern, the design of hydraulic fracturing simulation and the evaluation of induced earthquakes. In this paper, the Anelastic Strain Recovery (ASR in short) in-situ stress measurement method was employed to obtain the in-situ stress state of 3 ~ 4 km depth of of dry hot rock in Matouying area, Laoting County, Tangshan City. The results show that: (1) the magnitude of in-situ stress increases with depth. within the range of 3 139 ~ 3 934 m depth, the minimum horizontal principal stress is 59.0 ~ 90.7 MPa, the maximum horizontal principal stress is 103.7 ~ 123.6 MPa, and the maximum horizontal principal stress direction is N83 ~ 114°E. (2) the relationship of three principal stresses is σH > σv > σh, which indicates that the tectonic stress field gives priority to the horizontal stress, and the stress state is favorable for activity of strike-slip faults. (3) The stability of the fault was studied according to Mohr-Coulomb criterion, the result shows that the ratios of shear to effective normal stress are lower than those Byerlee’s law, indicating that the faults are in the relatively stable stress environment near the well M1 in matouying area within 3~4 km depth. (4) The analysis of the relationship between the water injection development and fault stability shows that the faults may become instability near the injecting well, when the continuous injection pressure on the ground reaches or exceeds about 28 MPa during the water injection development of 3900-4000 m depth in the study area, leading to the occurrence of medium and small earthquakes, which should be prevented in the development and utilization of the dry hot rock. This study have certain reference value for the analysis of geodynamics and the development and utilization of dry and hot rocks in Tangshan area.
keywords:Tangshan area  in-situ stress  anelastic strain recovery method  fault activity
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