松辽盆地深部基底地应力状态:来自松科2井地应力实测数据的证据  

In situ stress state of deep basement in the Songliao Basin:Evidence from in situ stress measurement in SK-2 borehole

作　　者：王斌[1,2] 孙东生[2] 李阿伟[2] 杨跃辉[2] 陈群策 WANG Bin;SUN Dongsheng;LI Awei;YANG Yuehui;CHEN Qunce(Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan 430010,China;Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [2]中国地质科学院地质力学研究所,北京100081

出　　处：《地学前缘》2024年第2期377-390,共14页Earth Science Frontiers

基　　金：国家自然科学基金面上项目(42174122);云南省重大科技专项计划项目(202002AF080003,202102AF080001);中央级公益性科研院所基本科研业务费项目(DZLXJK202201,CKSF2021462/YT,CKSF2023308/YT,CKSF2023316/YT)。

摘　　要：松辽盆地基底内的地应力状态是地震等地质灾害研究、盆地动力学分析和油气资源开发利用等领域的重要基础数据。岩心非弹性应变恢复法是近年来发展起来的基于钻孔岩心的近原位三维地应力测量方法。本文将岩心非弹性应变恢复法应用于松辽盆地大陆科学钻探松科2井(SK-2)深部地应力测量,获得了松辽盆地基底内近6~7 km的三维地应力状态,结果表明盆地基底内(6646~6846 m)为走滑断层应力环境(σ_(H)>σ_(V)>σ_(h)),最大水平主应力方向为近E-W方向。盆地基底内的应力状态与盆地内及周边邻近区域的震源机制解(震源深度7~15 km)所反演的应力环境相吻合。盆地基底处于以E-W向近水平挤压为主导的构造应力场,这种应力状态的形成,可能为西太平洋板块NW向挤压运动背景下,受控于NE-NEE走向的依兰—伊通断裂和敦化—密山断裂右行走滑产生的次级应力场。研究结果对于认识区域构造应力场背景及松辽盆地的形成与演化过程具有重要参考价值。The magnitude and orientation information of in situ stresses in the basement of the Songliao Basin are important data in geodynamics research,seismology,and deep resources exploitation and utilization.The anelastic strain recovery(ASR)method is a three-dimensional in situ stress measurement method based on drill cores.In this report,three-dimensional in situ stresses at 67 km depth in basement of SK-2 borehole in the Songliao Basin,Northeast China,is determined using ASR method.The stress state of basement(66466846 m)is consistent with thrust and strike-slip faulting regime(σ_(H)>σ_(V)>σ_(h))and the orientation of maximum horizontal principal stress is near E-W.The stress state determined by stress measurement is in agreement with results from focal mechanisms of shallow earthquakes(715 km)within the Songliao Basin and adjacent regions.The research findings should provide an important reference for the understanding of regional tectonic stress field and the formation and evolution of the Songliao Basin.

关 键 词：松辽盆地 松科二井 地应力 非弹性应变恢复法 震源机制解 

分 类 号：P631.815[天文地球—地质矿产勘探] P553[天文地球—地质学]