本文主要研究内容
作者李帅（2019）在《基于细—宏观力学的页岩脆性影响因素及表征方法研究》一文中研究指出：脆性评价是页岩储层可压性评价的关键环节,合理高效的页岩脆性评价体系可为页岩油气储层的高产和稳产提供重要保障。针对当前页岩脆性评价指标准确性、力学性质尺度效应规律和机理、脆性影响因素及矿场脆性方法认识模糊,缺乏深入研究的现状,本文采用美国GCTS公司生产的RTR-1000岩石三轴力学测试系统、600KN伺服试验机、美国Zeiss公司高分辨率三维X射线CT扫描系统和日本理学公司生产的D/Max2600型粉晶X射线衍射仪等先进仪器对部分鄂尔多盆地南部W区块长7段陆相页岩储层井下岩心和大量长7段野外页岩露头进行力学性质测试、细观缺陷扫描、矿物组分分析等实验,利用线性回归分析和灰色关联法对影响页岩脆性的影响因素进行了定性分析和定量计算,获得常见的评价页岩脆性力学指标的准确性,基于页岩岩样不同加载方式下的跨尺度力学试验,利用实验数据曲线拟合和岩石力学理论分析初步得到了页岩强度与变形的尺度效应规律和岩石强度尺度效应机理,基于有限元软件COMSOL和灰色数学模糊理论分析了构成页岩的细观矿物组分对宏观脆性的影响,分析了每种矿物在脆性评价时对脆性的贡献程度,并提出了一种新的结合页岩矿物组分和其脆性影响系数的脆性评价方法,同时为方便工程应用,提出了另一种考虑页岩储层力学环境和矿物组分含量的脆性新方法,以实现矿场快速准确的筛选高脆性段。结果表明:(一)页岩脆性评价指标及各评价指标准确性研究(1)围压、泊松比、弹性模量与页岩脆性呈正相关关系,峰值应变、峰值应力、破裂时间、残余应力、残余应变、差应力、破裂面条数与页岩脆性呈负相关关系;(2)峰值应变对页岩脆性评价准确性最高,弹性模量对页岩脆性评价准确性最低,中间依次为破裂时间、残余应变、峰值应力、差应力、残余应力、破裂面条数、围压、泊松比,其准确性比值依次为0.136:0.131:0.126:0.120:0.112:0.097:0.096:0.079:0.056:0.046;(二)页岩力学性质尺度效应研究(1)页岩单轴加载时,弹性模量、泊松比随岩样尺度增大而增大,峰值强度、峰值应变、残余应变、残余应力、破裂时间随岩样尺度增大而减小;不同尺度的岩样峰前为线弹性变形,应力-应变曲线斜率随岩样尺度增大而增大,峰后曲线迅速下降,但仍具有进一步抵抗外力载荷破坏的能力;不同尺度的岩样主要发生拉伸-剪切复合破坏,但发生剪切破坏时的剪切角均在10度附近,尺度越大的岩样,其破裂面条数越多;(2)页岩三轴加载试验中,泊松比随岩样尺度增大而增大,峰值强度、峰值应变随岩样尺度增大而减小,破裂面条数、残余应变、残余应力不随岩样尺度变化,三者平均值分别为2.2、2.93和36.17MPa;不同尺度的页岩峰前变形均存在线性段和屈服段,尺度越大的岩样,其应力-应变曲线峰后段下降速度越快,曲线越陡;小尺度岩样主要发生拉伸破坏,随着尺度增大,岩样主要发生剪切破坏,且剪切破坏时剪切角主要集中在45度附近;(3)巴西劈裂试验中,岩样最大载荷、破裂面条数随尺度的增大而增大,抗拉强度随岩样尺度增大而减小;不同尺度的岩样应力应变曲线均经历平缓段、线性段和峰后急速下降段;不同尺度的岩样破坏形式单一,均为拉伸破坏,尺度越大的岩样,其破裂面条数越多;(4)陆相页岩在三种加载条件下,单轴加载时强度与变形尺度效应现象最为明显,巴西劈裂试验次之,三轴加载时尺度最不明显;(5)岩石强度尺度效应是由岩石端部效应和非均质性共同决定,对于小尺度岩样,端部摩擦作用是岩石强度尺度效应的主要因素,对于大尺度岩样,岩石非均质性是岩石强度尺度效应的主要因素,合理的选择岩样尺度范围,对于研究岩石强度尺度效应规律和机理具有重要意义。(三)陆相页岩脆性影响因素及表征新方法(1)页岩矿物组分含量和分布特征、沉积力学环境等是影响页岩宏观脆性的重要因素,海相页岩硅质矿物、碳酸盐岩矿物等脆性矿物含量大,埋深较大,陆相页岩黏土矿物等延性矿物含量大,埋深浅,由于海相页岩和陆相页岩在矿物组分和埋深环境等方面的显著差异,海相页岩的脆性评价公式对陆相页岩难以适用;(2)W区块长7陆相页岩中白云石、菱铁矿、透辉石、伊利石、绿泥石、长石、石英对页岩脆性的影响逐渐减弱,脆性影响权重系数分别为0.136、0.117、0.138、0.173、0.145、0.136、0.157,权重系数相差最大不超过0.06,因此页岩脆性评价时各矿物对脆性的贡献均应予以考虑;(3)提出一种结合页岩矿物组分含量和其脆性影响系数的脆性评价新方法,并利用该方法对W区块L井进行脆性评价,指导该井压裂设计,实现了对页岩储层脆性的精确化表征;(4)提出了一种考虑页岩矿物组分和力学环境的脆性评价新方法,利用该方法指导W区块Y井压裂,压裂结果显示,新建立的脆性评价方法与储层压裂施工关联性较好,可以有效指导压裂。对页岩脆性影响因素和表征方法的研究不仅可以简化脆性评价的公式,还可以提高页岩储层脆性评价的准确性,为页岩储层评价和压裂施工等提供一定参考。
Abstract
cui xing ping jia shi xie yan chu ceng ke ya xing ping jia de guan jian huan jie ,ge li gao xiao de xie yan cui xing ping jia ti ji ke wei xie yan you qi chu ceng de gao chan he wen chan di gong chong yao bao zhang 。zhen dui dang qian xie yan cui xing ping jia zhi biao zhun que xing 、li xue xing zhi che du xiao ying gui lv he ji li 、cui xing ying xiang yin su ji kuang chang cui xing fang fa ren shi mo hu ,que fa shen ru yan jiu de xian zhuang ,ben wen cai yong mei guo GCTSgong si sheng chan de RTR-1000yan dan san zhou li xue ce shi ji tong 、600KNci fu shi yan ji 、mei guo Zeissgong si gao fen bian lv san wei Xshe xian CTsao miao ji tong he ri ben li xue gong si sheng chan de D/Max2600xing fen jing Xshe xian yan she yi deng xian jin yi qi dui bu fen e er duo pen de na bu Wou kuai chang 7duan liu xiang xie yan chu ceng jing xia yan xin he da liang chang 7duan ye wai xie yan lou tou jin hang li xue xing zhi ce shi 、xi guan que xian sao miao 、kuang wu zu fen fen xi deng shi yan ,li yong xian xing hui gui fen xi he hui se guan lian fa dui ying xiang xie yan cui xing de ying xiang yin su jin hang le ding xing fen xi he ding liang ji suan ,huo de chang jian de ping jia xie yan cui xing li xue zhi biao de zhun que xing ,ji yu xie yan yan yang bu tong jia zai fang shi xia de kua che du li xue shi yan ,li yong shi yan shu ju qu xian ni ge he yan dan li xue li lun fen xi chu bu de dao le xie yan jiang du yu bian xing de che du xiao ying gui lv he yan dan jiang du che du xiao ying ji li ,ji yu you xian yuan ruan jian COMSOLhe hui se shu xue mo hu li lun fen xi le gou cheng xie yan de xi guan kuang wu zu fen dui hong guan cui xing de ying xiang ,fen xi le mei chong kuang wu zai cui xing ping jia shi dui cui xing de gong suo cheng du ,bing di chu le yi chong xin de jie ge xie yan kuang wu zu fen he ji cui xing ying xiang ji shu de cui xing ping jia fang fa ,tong shi wei fang bian gong cheng ying yong ,di chu le ling yi chong kao lv xie yan chu ceng li xue huan jing he kuang wu zu fen han liang de cui xing xin fang fa ,yi shi xian kuang chang kuai su zhun que de shai shua gao cui xing duan 。jie guo biao ming :(yi )xie yan cui xing ping jia zhi biao ji ge ping jia zhi biao zhun que xing yan jiu (1)wei ya 、bo song bi 、dan xing mo liang yu xie yan cui xing cheng zheng xiang guan guan ji ,feng zhi ying bian 、feng zhi ying li 、po lie shi jian 、can yu ying li 、can yu ying bian 、cha ying li 、po lie mian tiao shu yu xie yan cui xing cheng fu xiang guan guan ji ;(2)feng zhi ying bian dui xie yan cui xing ping jia zhun que xing zui gao ,dan xing mo liang dui xie yan cui xing ping jia zhun que xing zui di ,zhong jian yi ci wei po lie shi jian 、can yu ying bian 、feng zhi ying li 、cha ying li 、can yu ying li 、po lie mian tiao shu 、wei ya 、bo song bi ,ji zhun que xing bi zhi yi ci wei 0.136:0.131:0.126:0.120:0.112:0.097:0.096:0.079:0.056:0.046;(er )xie yan li xue xing zhi che du xiao ying yan jiu (1)xie yan chan zhou jia zai shi ,dan xing mo liang 、bo song bi sui yan yang che du zeng da er zeng da ,feng zhi jiang du 、feng zhi ying bian 、can yu ying bian 、can yu ying li 、po lie shi jian sui yan yang che du zeng da er jian xiao ;bu tong che du de yan yang feng qian wei xian dan xing bian xing ,ying li -ying bian qu xian xie lv sui yan yang che du zeng da er zeng da ,feng hou qu xian xun su xia jiang ,dan reng ju you jin yi bu di kang wai li zai he po huai de neng li ;bu tong che du de yan yang zhu yao fa sheng la shen -jian qie fu ge po huai ,dan fa sheng jian qie po huai shi de jian qie jiao jun zai 10du fu jin ,che du yue da de yan yang ,ji po lie mian tiao shu yue duo ;(2)xie yan san zhou jia zai shi yan zhong ,bo song bi sui yan yang che du zeng da er zeng da ,feng zhi jiang du 、feng zhi ying bian sui yan yang che du zeng da er jian xiao ,po lie mian tiao shu 、can yu ying bian 、can yu ying li bu sui yan yang che du bian hua ,san zhe ping jun zhi fen bie wei 2.2、2.93he 36.17MPa;bu tong che du de xie yan feng qian bian xing jun cun zai xian xing duan he qu fu duan ,che du yue da de yan yang ,ji ying li -ying bian qu xian feng hou duan xia jiang su du yue kuai ,qu xian yue dou ;xiao che du yan yang zhu yao fa sheng la shen po huai ,sui zhao che du zeng da ,yan yang zhu yao fa sheng jian qie po huai ,ju jian qie po huai shi jian qie jiao zhu yao ji zhong zai 45du fu jin ;(3)ba xi pi lie shi yan zhong ,yan yang zui da zai he 、po lie mian tiao shu sui che du de zeng da er zeng da ,kang la jiang du sui yan yang che du zeng da er jian xiao ;bu tong che du de yan yang ying li ying bian qu xian jun jing li ping huan duan 、xian xing duan he feng hou ji su xia jiang duan ;bu tong che du de yan yang po huai xing shi chan yi ,jun wei la shen po huai ,che du yue da de yan yang ,ji po lie mian tiao shu yue duo ;(4)liu xiang xie yan zai san chong jia zai tiao jian xia ,chan zhou jia zai shi jiang du yu bian xing che du xiao ying xian xiang zui wei ming xian ,ba xi pi lie shi yan ci zhi ,san zhou jia zai shi che du zui bu ming xian ;(5)yan dan jiang du che du xiao ying shi you yan dan duan bu xiao ying he fei jun zhi xing gong tong jue ding ,dui yu xiao che du yan yang ,duan bu ma ca zuo yong shi yan dan jiang du che du xiao ying de zhu yao yin su ,dui yu da che du yan yang ,yan dan fei jun zhi xing shi yan dan jiang du che du xiao ying de zhu yao yin su ,ge li de shua ze yan yang che du fan wei ,dui yu yan jiu yan dan jiang du che du xiao ying gui lv he ji li ju you chong yao yi yi 。(san )liu xiang xie yan cui xing ying xiang yin su ji biao zheng xin fang fa (1)xie yan kuang wu zu fen han liang he fen bu te zheng 、chen ji li xue huan jing deng shi ying xiang xie yan hong guan cui xing de chong yao yin su ,hai xiang xie yan gui zhi kuang wu 、tan suan yan yan kuang wu deng cui xing kuang wu han liang da ,mai shen jiao da ,liu xiang xie yan nian tu kuang wu deng yan xing kuang wu han liang da ,mai shen jian ,you yu hai xiang xie yan he liu xiang xie yan zai kuang wu zu fen he mai shen huan jing deng fang mian de xian zhe cha yi ,hai xiang xie yan de cui xing ping jia gong shi dui liu xiang xie yan nan yi kuo yong ;(2)Wou kuai chang 7liu xiang xie yan zhong bai yun dan 、ling tie kuang 、tou hui dan 、yi li dan 、lu ni dan 、chang dan 、dan ying dui xie yan cui xing de ying xiang zhu jian jian ruo ,cui xing ying xiang quan chong ji shu fen bie wei 0.136、0.117、0.138、0.173、0.145、0.136、0.157,quan chong ji shu xiang cha zui da bu chao guo 0.06,yin ci xie yan cui xing ping jia shi ge kuang wu dui cui xing de gong suo jun ying yu yi kao lv ;(3)di chu yi chong jie ge xie yan kuang wu zu fen han liang he ji cui xing ying xiang ji shu de cui xing ping jia xin fang fa ,bing li yong gai fang fa dui Wou kuai Ljing jin hang cui xing ping jia ,zhi dao gai jing ya lie she ji ,shi xian le dui xie yan chu ceng cui xing de jing que hua biao zheng ;(4)di chu le yi chong kao lv xie yan kuang wu zu fen he li xue huan jing de cui xing ping jia xin fang fa ,li yong gai fang fa zhi dao Wou kuai Yjing ya lie ,ya lie jie guo xian shi ,xin jian li de cui xing ping jia fang fa yu chu ceng ya lie shi gong guan lian xing jiao hao ,ke yi you xiao zhi dao ya lie 。dui xie yan cui xing ying xiang yin su he biao zheng fang fa de yan jiu bu jin ke yi jian hua cui xing ping jia de gong shi ,hai ke yi di gao xie yan chu ceng cui xing ping jia de zhun que xing ,wei xie yan chu ceng ping jia he ya lie shi gong deng di gong yi ding can kao 。
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论文详细介绍
论文作者分别是来自西安石油大学的李帅，发表于刊物西安石油大学2019-07-04论文，是一篇关于页岩论文,细宏观力学论文,脆性评价论文,影响因素论文,跨尺度表征方法论文,西安石油大学2019-07-04论文的文章。本文可供学术参考使用，各位学者可以免费参考阅读下载，文章观点不代表本站观点，资料来自西安石油大学2019-07-04论文网站，若本站收录的文献无意侵犯了您的著作版权，请联系我们删除。
标签：页岩论文; 细宏观力学论文; 脆性评价论文; 影响因素论文; 跨尺度表征方法论文; 西安石油大学2019-07-04论文;