鄂尔多斯块体周缘中强地震序列类型及其活动特征   总被引：4，自引：1，他引：3  

方炜  刘春  张春生 《地震研究》2004,27(3):216-218

系统分析了鄂尔多斯块体周缘1970—2002年发生的27次5级左右地震序列的震级结构,这些地震序列可分为孤立型、主震型、震群型三种。结果表明,该区27次中强地震序列中,有22％为孤立型,14．8％为震群型,其余为主震型。在已选取的地震序列中,无前震以及有1次前震的比例为18．5％,有2次或2次以上的占81．5％。同时在鄂尔多斯块体西南边缘地震以孤立型为主,在鄂尔多斯块体北东东向的主压应力轴线上发生的地露名为需群珏!f。以卜结果可作为鄂尔多斯块体地区震后趋势判断的依据。  相似文献   

澜沧江断裂带的新生代走滑运动学特点   总被引：10，自引：1，他引：9  

钟康惠刘肇昌  舒良树李凡友 施央申 《地质论评》2004,50(1):1-8

通过对澜沧江断裂带北、中、南段新生代构造形迹的运动学解析,结合前人工作,论证了澜沧江断裂在新生代早期(古新世-中始新世末)、中期(晚始新世-渐新世末)、晚期(中新世-第四纪)的走滑运动序列为：中、南段,右行→左行→右行;北段,左行→左行→右行。研究表明,澜沧江断裂带早期主要表现为中、南段的右行逆冲和北段的左行逆冲,与同期发生的昌都-思茅地体颈缩事件相对应,其地球动力学背景与太平洋板块向西推挤作用以及扬子-华南板块与印度板块发生的强烈东西向碰撞挤压有关;中期,整个断裂发生左行逆冲,其地球动力学背景与南海盆地的扩张作用及其扬子-华南板块相对于印度板块北移所致的左行扭动相适应：晚期,整个断裂右行走滑,与太平洋构造域的南海盆地扩张终止,昌都思茅地体整体向南东逃逸相适应。  相似文献   

松辽盆地双城区块扶余油层高分辨率层序格架下沉积相及砂体发育特征^*     

邓庆杰  胡明毅  刘新东  康德江 《古地理学报》2018,20(2):311-324

随着致密砂岩岩性油气藏勘探开发程度的深入,拗陷型湖盆河流—浅水三角洲储集层已经成为勘探开发重点。以松辽盆地北部双城区块扶余油层为研究对象,运用岩心、测井、录井以及地震资料,系统地开展高分辨率层序地层研究,识别出多级次基准面旋回界面,将双城区块扶余油层划分为2个长期基准面旋回和7个中期基准面旋回。在此基础之上,深入分析高分辨率层序地层格架下的河流—浅水三角洲沉积相及储集层砂体发育特征。研究表明: 受长期基准面下降—上升的变化控制,垂向上,从MSC1到MSC7沉积充填响应呈现三角洲平原沉积—曲流河沉积—三角洲平原沉积—三角洲前缘沉积的特点,其岩性、沉积构造、旋回期次以及规模也随之具有明显变化;主要储集层砂体类型依次为分流河道、曲流河道、分流河道和水下分流河道,平面上的砂体呈条带状分布,顺物源方向由西南向东北砂地比逐渐变小,MSC4-MSC5时期砂体最为发育,储集层质量最好;在构造稳定拗陷湖盆背景下,湖平面升降是储集层砂体发育特征的主要控制因素。  相似文献   

鄂尔多斯盆地东缘保德地区上古生界层序地层与沉积相特征^*     

侯中帅  陈世悦  王越  李天宝  赫庆庆  崔绮梦 《古地理学报》2018,20(2):231-243

为了揭示鄂尔多斯盆地东缘层序地层与沉积相特征,以层序地层学和沉积学理论为指导,对鄂尔多斯盆地东缘保德扒楼沟剖面及周缘上古生界的层序与体系域界面类型、层序结构、沉积相类型及沉积演化进行研究。依据区域性不整合面、下切谷冲刷面、海侵方向转换面和区域性海退面等层序界面将研究区上古生界划分为7个三级层序,分别对应于本溪组、太原组2段、太原组1段、山西组、下石盒子组、上石盒子组和石千峰组。保德扒楼沟及周缘上古生界剖面发育16种岩石类型和8种岩石组合。区内上古生界发育障壁海岸相、碳酸盐岩台地相、辫状河相和曲流河相。SQ1-SQ3中低位体系域发育风化壳和潮道亚相,海侵体系域发育潮坪亚相和潟湖亚相,高位体系域发育碳酸盐岩台地相、潟湖亚相和潮坪亚相;SQ4-SQ7中低位体系域发育辫状河河床亚相,海侵体系域主要发育曲流河泛滥平原亚相,高位体系域主要发育多期曲流河河床亚相—堤岸亚相—泛滥平原亚相的演化序列。区内上古生界经历了由障壁海岸相和碳酸盐岩台地相向河流相的演化过程,沉积演化主要受物源供给、海平面变化和构造活动的控制。  相似文献   

南黄海中部隆起海相中-古生界科学钻探CSDP-2井选址     

吴志强  郭兴伟  赵维娜  张训华  祁江豪  张晓华  蔡来星 《吉林大学学报(地球科学版)》2019,49(1):13-25

2014年,大陆架科学钻探项目（CSDP）确定采用自主研发的轻便型海洋钻井平台"探海1号"在南黄海盆地中部隆起上实施首口科学钻探井（CSDP-2井）,其科学目标是探查中部隆起的中-古生界地质结构和油气地质条件,解决南黄海中部隆起海相残留盆地长期悬而未决的地层属性问题,同时为区域地质、海陆演化与海相油气资源前景研究和评价提供基础资料。据此确定钻孔的选址原则为：钻探海域水深不超过30 m,在预定2 800 m的钻探深度范围内钻遇多套完整的中-古生界海相地层。根据钻探目标和选址原则,针对中部隆起没有钻探资料的状况,以区域地质特征和周边钻井对比为参考,以地震资料多属性解释为手段,标定了地震反射层位,解释并编制了反射层构造图,拟定了钻探井位,预测了钻探层位;采用地震储层预测技术预测了有利储层。上述工作形成了无井勘探区的钻探井位部署技术流程和方法,经钻探厘定了三叠纪-奥陶纪海相沉积层,并发现了多个油气显示层,达到了预定钻探目标。  相似文献   

Generation and analysis of expressed sequence tags from the salt-tolerant eelgrass species, Zostera marina     

KONG Fann  ZHOU Yang  SUN Peipei  LIU Limin  MAO Yunxiang 《海洋学报(英文版)》2013,32(8):68-78

Zosteramarina, a monocotyledonous angiosperm, is one of themost important seagrass species. To investigate the salt-tolerancemechanismand discover salt-tolerant genes in Z. marina, a cDNA library was constructed. Single-pass sequencing of the 5' ends of 4 081 clones yielded 4 002 high quality expressed sequence tags (ESTs), which were assembled into 241 contigs and 1 673 singletons, representing 1 914 unigenes. The average length of the ESTs was 582 bp, with sizes ranging from100-1 500 bp. Basic Local Alignment Search Tool (BLASTX) analysis revealed that 1 664 unigenes had significant homology to known genes in the National Center for Biotechnology Information (NCBI) non-redundant (nr) database (E-value≤5-10). Among them, the twomost abundant genes encoded metallothionein (157 ESTs) and chlorophyll a/b-binding protein (38 ESTs), accounting for 7.1% and 1.7% of the total ESTs, respectively. Using Kyoto Encyclopedia of Genes and Genomes (KEGG), 1 462 unigeneswere assigned to 1 161 pathways (E-value≤5-10). A total of 938 unigenes were assigned Gene Ontology (GO) terms based on the GO hierarchy analysis, and InterProScan searches recognized 1 003 InterPro families. Three genes formetallothionein in Z. marina that belonged to Class II was identified. Results of this study will improve understanding of the molecular mechanisms of saline tolerance in Z.marina.  相似文献   

声学探测技术在近岸水域地震地层探测中的应用   总被引：10，自引：1，他引：9  

王揆洋  郑彦鹏  王述功 《海洋地质与第四纪地质》1999,19(4):97-101

对山东省海阳冷家庄东南近岸海域浅、中深层地层声学探测剖面进行了分析对比,对研究区内的地震地层层序和基岩的构造特征地判有研究区存在着３个地震反射波且,分别代表了３套没形成时代、不同 地层,综合海底浅层柱状取样结果及陆上地层露头情况,推测这３个地震反射波层组分别与第四纪浅海相泥砂质沉积,白垩纪莱阳群中上部的中、薄层粉砂岩和莱阳群的厚层石英砂岩相对应。并且,发育于基岩内的断层构造在第二、三反射波层组内具  相似文献   

High-resolution sequence stratigraphy of clastic shelves VI: Mixed siliciclastic-carbonate systems     

《Marine and Petroleum Geology》2017

High-frequency sequences composed of mixed siliciclastic-carbonate deposits may exhibit either vertical or horizontal changes between siliciclastics and carbonates. Vertical facies shifts occur between systems tracts and define a ‘reciprocal sedimentation’ pattern, typically consisting of transgressive/highstand carbonates and forced regressive/lowstand siliciclastics, although variations from this rule are common. Mixed systems with lateral facies change, usually typifying transgressive and/or highstand systems tracts, may exhibit proximal siliciclastics and distal carbonates or vice-versa, although variations may also occur along depositional strike. The marked variability of mixed siliciclastic-carbonate sequences makes the definition of a universal sequence stratigraphic model impossible, as the composition and geometries of systems tracts may change considerably, and sequence stratigraphic surfaces and facies contacts may vary in terms of occurrence and physical expression. However, some resemblance exists between siliciclastic sequences and mixed sequences showing lateral facies changes between siliciclastics and carbonates. In particular, these mixed sequences display 1) a stratal architecture of the clastic part of the systems tracts that is comparable to that of siliciclastic deposits, 2) a dominant role of the inherited physiography and of erosional processes, rather than carbonate production, in shaping the shelf profile, and 3) a local lateral juxtaposition of siliciclastic sandstones and carbonate bioconstructions due to hydrodynamic processes. These observations are helpful in predicting the location of porous and potential sealing bodies and baffles to fluid flow at the intra-high-frequency sequence scale, and ultimately they are useful for both petroleum exploration and production.  相似文献   

Sedimentology and seismic geomorphology of a lacustrine depositional system from the deep zone of the Gaoyou Sag,Subei Basin,eastern China     

D. Wu  D. Zhao  Y. Li  Y. Ma  Y. Dong 《Australian Journal of Earth Sciences》2017,64(2):265-282

Sandstones of the Dainan Formation in the Gaoyou Sag of the Subei Basin are important hydrocarbon reservoirs. This paper studies the sedimentary facies and sandstone dispersal patterns in the Gaoyou Sag, based on the analysis of sedimentology and seismic geomorphology. The data used in this study include lithological data, wire-line-log data and three-dimensional (3D) seismic data. The target strata are the Eocene Daiyi Member (E₂d₁³, E₂d₁² and E₂d₁¹) and the lower Dai'er Member (E₂d₂⁵), which belong to three third-order sequences. Five types of depositional systems were identified in the Dainan Formation based on core observation and log-facies analysis. They are, respectively, delta, fan delta, sub-lacustrine fan, nearshore subaqueous fan and lacustrine system. Stratal slices from 3D seismic volumes have been used to map the sandstone dispersal patterns and to document the evolution of the depositional systems within these third-order sequences and associated systems tracts. In the low-stand systems tract and the high-stand systems tract, sandstones of delta, fan delta and nearshore subaqueous fan were well developed and can be delineated by stratal slices showing distinct progradation towards the deep lake centre. In the transgressive systems tract, sandstones are less common. Stratal slices indicate that the depositional environments of individual third-order sequences evolved from gravel-rich or sand-rich fans to lacustrine mudstones, and finally to mixed sandstone–mudstone fans. Sandstone dispersal patterns appear to be primarily controlled by syn-sedimentary faults, and generally sandstone thickness decreases with distance from the syn-sedimentary faults. Deltas and fan deltas have different characteristics in sand-body thickness because they have different sedimentary subfacies. The proposed geomorphology and sedimentary evolution of the lacustrine depositional system may aid in the prediction of potential reservoir distribution in the Gaoyou Sag.  相似文献   

中国盆地动力学研究现状及展望   总被引：3，自引：1，他引：2  

解习农  林畅松  李忠  任建业  姜涛  姜在兴  雷超 《沉积学报》2017,35(5):877-887

沉积盆地既是人类最重要的资源宝库,又包含了丰富的全球气候变化、流体流动和地球动力学等相关信息。人类社会对矿产资源和水资源的大量需求推动盆地分析领域的快速发展,地球科学家对沉积盆地开展了多年的系统性探索,在盆地形成和演化机制、沉积充填、盆地流体及相关资源的聚集过程等诸多方面的研究取得了一系列重要的进展和突破,形成了一门新兴的学科—盆地动力学。近年来,我国学者在大型叠合盆地和大陆边缘盆地的动力学过程、陆相盆地层序地层、深水沉积、源—汇系统等方向取得了显著成绩和突出进展。相关成果不仅有效地服务于能源、矿产、水资源等各类资源勘探,而且为地球动力学、重大构造事件、全球环境变迁及气候演变研究提供了丰富资料和详实证据。  相似文献