Enrichment Patterns and New Discovery of Deep Lacustrine Shale Oil in the Upper Cretaceous Qingshankou Formation,Songliao Basin,NE China     

LIU Weibin  XU Xingyou  BAI Jing  LIU Chang  CHEN Shan  LI Yaohua 《《地质学报》英文版》2021,95(4):1426-1428

正Objective The Songliao Basin is located in northeastern China. The Upper Cretaceous Qingshankou Formation(Fm.)(K2 qn), Yaojia Fm.(K2 y), and Nenjiang Fm.(K2 n) were deposited in its depression. The sediments are mainly continental clastic rocks. The first member of the Qingshankou Fm.(K2 qn1) in the southern Songliao Basin mainly comprises semi-deep to deep lacustrine shale of large thickness, generally 30,100 m, with wide distribution; the thickness of the shale has an average thickness of 70 m.  相似文献   

Comparative Study of Acid and Alkaline Stimulants with Granite in an Enhanced Geothermal System     

XU Jianan  FENG Bo  CUI Zhenpeng  LIU Xiyao  KE Zunsong  FENG Guanhong 《《地质学报》英文版》2021,95(6):1926-1939

The Enhanced Geothermal System (EGS) is an artificial geothermal system that aims to economically extract heat from hot dry rock (HDR) through the creation of an artificial geothermal reservoir. Chemical stimulation is thought to be an effective method to create fracture networks and open existing fractures in hot dry rocks by injecting chemical agents into the reservoir to dissolve the minerals. Granite is a common type of hot dry rock. In this paper, a series of chemical stimulation experiments were implemented using acid and alkaline agents under high temperature and pressure conditions that mimic the environment of formation. Granite rock samples used in the experiments are collected from the potential EGS reservoir in the Matouying area, Hebei, China. Laboratory experimental results show that the corrosion ratio per unit area of rock is 3.2% in static acid chemical experiments and 0.51% in static alkaline chemical experiments. The permeability of the core is increased by 1.62 times in dynamic acid chemical experiments and 2.45 times in dynamic alkaline chemical experiments. A scanning electron microscope analysis of the core illustrates that secondary minerals, such as chlorite, spherical silica, and montmorillonite, were formed, due to acid-rock interaction with plagioclase being precipitated by alkaline-rock interactions. Masking agents in alkaline chemical agents can slightly reduce the degree of plagioclase formation. A chemical simulation model was built using TOUGHREACT, the mineral dissolution and associated ion concentration variation being reproduced by this reactive transport model.  相似文献   

北京平原区土壤地球化学特征及影响因素分析     

李欢  黄勇  张沁瑞  贾三满  徐国志  冶北北  韩冰 《物探与化探》2021,(2):502-516

基于北京平原区土壤地球化学调查数据,运用数理统计、因子分析、相关性分析、回归分析等方法研究了土壤元素的横向和纵向分布特征,并探讨其影响因素。结果表明:北京平原区土壤CaO、MgO、Na 2O、Hg、Cd、Sr、Ba、Sn等含量偏高,Sb、As、Th、W、Br、U、I、Mo、有机质等含量偏低。R型因子分析结果显示,F1因子为反映土壤原始背景特征的元素组合,F2、F4、F6因子为反映人类活动对土壤元素分布特征影响的元素组合,F3因子为反映成土母质基本信息的元素组合,F5因子为反映成土母岩基本特征的元素组合。利用一元非线性回归分析对部分元素的垂向分布特征进行数学建模,回归系数R 2值为0.542~0.960,拟合效果总体较好;从区域尺度上初步判断出人类活动对重金属元素Cu、Hg、Pb、Zn影响深度约150~200 cm,对养分指标N、P、S、Se、有机质影响深度约50~100 cm。一般情况下,褐土中Se、Bi、Li、有机质、Mo、W等39项元素与指标的含量高于潮土,不同土壤质地中As、Cd、Cr、Ni、N、B等29项元素含量的大小关系为:砂质壤土<砂质黏壤土<黏壤土<壤质黏土,耕地土壤中Cd、N、P、有机质含量明显高于林地,中心城区土壤中有害重金属元素、养分指标的含量普遍高于郊区。  相似文献   

Geochemistry and Tectonic History of Seamount Remnants in the Xingshuwa Subduction Accretionary Complex of the Xar Moron Area,Eastern Margin of the Central Asian Orogenic Belt     

CHENG Yang  XIAO Qinghui  LI Tingdong  LI Yan  FAN Yuxu  XU Liquan  GUO Lingju  PANG Jinli 《《地质学报》英文版》2021,95(4):1086-1098

This study focuses on the geology, geochemistry, zircon U-Pb geochronology and tectonic settings of the three types of seamount basalts from the Xingshuwa subduction accretionary complex in the Xar Moron area, eastern margin of the Central Asian Orogenic Belt(CAOB). The seamount remnants are composed of carbonate 'cap' sediments, large volumes of pillow and massive basalts, carbonate breccia slope facies and radiolarian cherts. Group 1 basalts are characterized by high contents of P2 O5 and TiO2 with alkaline affinity and LREE enrichment, indicating that they are derived from intraplate magma. Group 2 basalts display N-MORB LREE depletion patterns, indicating that they were formed at a mid-ocean ridge. Group 3 basalts have shown distinct Nb depletion and high Th/Yb ratios, indicating that they were generated in an island arc tectonic setting. The zircon U-Pb age of Group 1 basalt sample XWT18-131 is 576.4 ± 9.4 Ma, suggesting that the oceanic island seamount was the product of intraplate magmatism related to a mantle plume or 'hot spot' in the late Neoproterozoic. The zircon U-Pb age of Group 2 basalt sample XWT18-132 is 483 ± 22 Ma, indicating that the Paleo-Asian Ocean(PAO) was continuously expanding in the Early Ordovician. The zircon U-Pb age of Group 3 basalt sample XWT18-101 is 240.5 ± 8.2 Ma, suggesting that this area underwent the evolutionary path of ocean-continent transition, developing towards continentalization during the Middle Triassic. Thus, we believe that there was both mantle plume-related intraplate magmatism and intraoceanic subduction during the evolution of the PAO, the CAOB possibly being an evolutionary model of an intraoceanic subduction and mantle plume magmatism complex.  相似文献   

渤海湾盆地石臼坨东428潜山构造成因解析:华北克拉通破坏的深度揭示     

王宇  徐春强  郭玲莉  刘永江  王光增  刘博  李三忠  关庆彬  蒋立伟  陈昭旭  李法坤  周琦杰  袁菁莲 《大地构造与成矿学》2021,45(1):219-228

渤海湾盆地是在中生代华北克拉通破坏基础上,经由新生代深埋形成的叠合盆地,遭受了多期不同性质构造叠加改造。渤海海域油气资源的勘探逐步走向深层,深部潜山油气藏成为重要的勘探目标。本文以石臼坨东428潜山构造(以下简称428构造)为例,探索渤海湾盆地潜山的形成和构造演化。基于前人对渤海湾盆地内构造和储层特征的研究成果,通过对地震剖面的精确解析,结合相干切片和其他地质资料,系统研究428构造各个阶段的变形特征,特别是对428构造的断裂特征进行了平面和剖面上的解析与断裂组合分析。结果发现:428构造东、西侧现今差异主要是由一条斜跨该构造的NEE向断裂导致的,对比邻区野外应变测量分析,识别出五期构造应力场,分别对应于印支期、燕山期和喜山期的各阶段应力场变化,并结合428构造及其周缘残留地层等方面的证据,进而认为428构造经历了中生代印支期-燕山早期逆冲、燕山中-晚期伸展、燕山末期挤压及新生代右行右阶的走滑-拉分构造叠加的多期复合构造模式。  相似文献   

苏门答腊中部Panti早始新世S型花岗岩地球化学特征及其新特提斯构造意义     

余小清  钱鑫  张玉芝  徐畅  王岳军 《大地构造与成矿学》2021,45(3):570-585

苏门答腊地处特提斯构造域与印度洋岛弧系统之内,区内广泛发育中-新生代火成岩.这些火成岩对特提斯构造带的延伸及界定具有重要意义,但目前对于苏门答腊岛的研究程度较低.本文选取苏门答腊岛中部Panti地区的花岗岩进行了岩相学、锆石年代学、锆石原位Hf同位素和全岩地球化学研究.年代学研究表明,Panti花岗岩锆石U-Pb年龄为55.5±0.3 Ma.该套花岗岩具有高SiO2(76.61％～78.37％)和高碱(Na2O+K2O=7.47％～8.21％)的特征,其分异指数(DI)为95～96,A/CNK为1.08～1.12,为高分异S型花岗岩.稀土配分模式图及微量元素蛛网图显示其具有强烈的Eu负异常(Eu/Eu*=0.04～0.05),并亏损Nb、Ta、Sr、P和Ti的特征.且该套花岗岩还具有高Rb/Sr和低CaO/Na2O值,同时显示富集的锆石Hf同位素组成(εHf(t)=-9.1～-2.6)和较老的Hf二阶模式年龄(tDM2=1.29～1.70 Ga),这些特征均指示该套花岗岩来源于古老的变泥质岩的部分熔融.对比缅甸-滇西-藏南一带同时期的岩浆事件,我们认为Panti早始新世高分异S型花岗岩可与滇西腾梁和东盈江同时期花岗岩进行对比,指示了新特提斯构造岩浆带南延至苏门答腊中部.  相似文献   

西准噶尔达尔布特蛇绿岩带萨尔托海岩体深部结构、构造特征:地质与地球物理证据     

李海  李永军  徐学义  万阈  赵强  杨高学  王祚鹏 《大地构造与成矿学》2021,45(4):634-650

西准噶尔地区分布多条蛇绿混杂岩带,地表地质已有大量研究成果,但蛇绿岩深部结构构造研究相对薄弱,一定程度上制约了该地区地质构造演化的深入认识.为此,本文选取达尔布特蛇绿混杂岩带萨尔托海段开展了大比例尺地质填图配套地面重力、磁法和可控源音频大地电磁测深(CSAMT)等综合测量,获得了该蛇绿岩体地表分布、接触关系以及深部的磁性、密度结构和电性特征,精细刻画了蛇绿岩的深部结构与构造,并进一步分析了其侵位机制和动力学过程.萨尔托海蛇绿岩具有低重力、高磁性和变化范围较宽的电阻率值,岩体整体以构造岩块状产出,表现出挤压逆冲、走滑剪切、破碎蚀变等变形变质.本文及前人研究成果表明,萨尔托海岩体是在近东西向挤压兼走滑应力作用下以斜向楔冲形式构造就位,并进一步受到后期左行走滑和岩浆作用的叠加改造.结合区域构造演化,西准噶尔蛇绿岩的构造侵位与晚石炭世板块汇聚背景下残余洋盆的收缩有关,持续的挤压兼走滑应力使残余洋盆下伏基底蛇绿岩沿断裂构造侵位于上覆沉积地层.  相似文献   

珠江口盆地中中新世SQ14.8层序-沉积演化及其地质意义     

陈维涛  孙珍  何敏  张琴  王文勇  王绪诚  徐少华 《大地构造与成矿学》2021,45(5):875-891

中中新世,位于南海北部陆缘的珠江口盆地发生了构造、沉积和古气候格局的骤然变迁,而对古珠江沉积体系层序、沉积的研究为重塑该变革提供了良好契机.本文利用珠江口盆地三维地震和钻井资料,选取中中新世SQ14.8三级层序开展了系统的层序地层和沉积解剖,通过厘定关键层序、体系域界面,建立了高精度区域四分体系域格架,并在此基础上重建陆架-陆坡区主要沉积体系的宏观展布特征和演化过程.研究发现,SQ14.8三级层序记录了珠江口盆地新近纪以来最大规模的一次相对海平面下降,引发沉积滨线跨越陆架长距离迁移到陆架坡折,发育了从低位到强制海退完整的体系域单元.古珠江三角洲作为陆架区主要的沉积体系,在相对海平面升降旋回的驱动下,其发育位置从内陆架到陆架边缘的迁移过程中,发育主控因素也由河流作用为主逐渐变为河流和海洋水动力共同控制.强制海退体系域的识别及沉积展布研究为预测深水储层提供了依据,该时期发育的陆架边缘三角洲下方陆坡区是寻找富砂重力流储集体的有利地区,而陆架边缘三角洲侧翼砂质沉积较少,下方的扇体以泥质扇为主.综合分析认为中中新世变冷事件是造成13.8 Ma相对海平面强烈下降的主要原因,在珠江口盆地促成SQ14.8层序典型强制海退体系域及陆架边缘三角洲的发育,进一步证明该事件是一次全球性的气候事件,其响应不仅可以在大洋钻孔获取的O同位素中找到证据,在边缘海盆的沉积记录中也有明显反映.  相似文献   

复杂环境条件下地铁降水回灌系统设计与研究     

许亮  欧志亮  郭高轩  沈媛媛  戚琦  南英华  芮小平 《城市地质》2021,16(3):332-338

针对北京市地铁丰益桥南站和丰益桥南站—终点区间施工降水回灌场地周边复杂环境,基于抽水试验、场地回灌试验、周边回灌试验等,从回灌池的深度、回灌井的深度、单井回灌水量、回灌井布置等方面设计了回灌系统.分别采用解析法和数值法检验了回灌系统方案的合理性,最终确定了以84眼小口径井和1眼大口井进行补充的回灌方案能满足施工降水排水需求.经实际运行显示,系统回灌总量7261×104 m3,实现了地铁降水排水100％资源性回灌.  相似文献   

青海省那陵郭勒河中游晚三叠世侵入岩地球化学特征及地质意义     

吉明甲  魏丽琼  徐博  刘博  白洪溪  陈晓琳  李兄 《西北地质》2021,(1)

那陵郭勒河中游位于东昆仑西段祁漫塔格地区,分布着大量的花岗岩。对该地区晚三叠世侵入岩的研究有助于认识东昆仑造山带印支期构造-岩浆演化历史。对研究区内花岗岩进行了岩石学、年代学及岩石地球化学分析。分析结果表明,研究区花岗闪长岩和二长花岗斑岩锆石LA-ICP-MS U-Pb年龄分别为(225.7±1)Ma、(213.74±1)Ma,为晚三叠世岩浆活动产物。岩石地球化学分析结果显示,该地区晚三叠世侵入岩属高钾钙碱性系列,饱和铝指数显示为偏铝质到过铝质,富集Rb、Th、K等大离子亲石元素和轻稀土元素,明显亏损Nb、P、Ti等高场强元素。花岗岩具有I型花岗岩特征,具有板块俯冲阶段的特征。通过分析认为岩浆岩形成于板块碰撞前的火山弧环境中。  相似文献