南堡凹陷东营组高精度层序地层格架及沉积体系分析   总被引：1，自引：0，他引：1  

苗顺德  李秋芬  梁建设  陈艳鹏 《吉林大学学报(地球科学版)》2011,(Z1):61-68

在高分辨率三维地震、钻井以及大量地质资料研究基础上,根据层序地层界面特征,将南堡凹陷东营组划分为1个二级层序和4个三级层序。以初始洪泛面和最大洪泛面识别特征为依据,进一步将三级层序划分出体系域。通过层序地层格架特征及其发育位置分析,认为柳南次凹层序地层格架发育的主控因素为构造、物源和湖平面变化。应用层序地层学原理及南堡凹陷沉积充填背景研究,认为柳南次凹的沉积体系类型为冲积扇、扇三角洲、水下扇、重力流及湖泊沉积体系。冲积扇及水下扇体系在低位体系域中发育,高位体系域中扇三角洲体系和重力流发育,湖扩体系域中湖泊体系非常发育。  相似文献   

黔西织纳煤田上二叠统层序地层及聚煤作用   总被引：2，自引：0，他引：2  

郭立君  洪愿进  邵龙义  易同生  张卫平  汪浩 《古地理学报》2011,13(5):493-500

贵州西部织(织金)纳(纳雍)煤田以发育海陆过渡相含煤岩系而成为研究西南地区晚二叠世沉积相及层序地层的理想地区.作者对该煤田上二叠统含煤岩系(龙潭组和长兴组)进行了高分辨率层序地层分析,并探讨了层序地层格架下煤层厚度的变化规律.以区域不整合面以及下切谷砂体底部冲刷面等为层序界面,结合石灰岩标志层向古陆方向延伸距离而显示的...  相似文献   

Depositional architecture and sequence stratigraphy of the Karoo basin floor to shelf edge succession, Laingsburg depocentre, South Africa     

S.S. Flint  D.M. HodgsonA.R. Sprague  R.L. BruntW.C. Van der Merwe  J. FigueiredoA. Prélat  D. BoxC. Di Celma  J.P. Kavanagh 《Marine and Petroleum Geology》2011,28(3):658-674

The Laingsburg depocentre of the SW Karoo Basin, South Africa preserves a well-exposed 1200 m thick succession of upper Permian strata that record the early filling of a basin during an icehouse climate. Uniformly fine-grained sandstones were derived from far-field granitic sources, possibly in Patagonia, although the coeval staging and delivery systems are not preserved. Early condensed shallow marine deposits are overlain by distal basin plain siltstone-prone turbidites and volcanic ashes. An order of magnitude increase in siliciclastic input to the basin plain is represented by up to 270 m of siltstone with thin sandstone turbidites (Vischkuil Formation). The upper Vischkuil Formation comprises three depositional sequences, each bounded by a regionally developed zone of soft sediment deformation and associated 20-45 m thick debrite that represent the initiation of a major sand delivery system. The overlying 300 m thick sandy basin-floor fan system (Unit A) is divisible into three composite sequences arranged in a progradational-aggradational-retrogradational stacking pattern, followed by up to 40 m of basin-wide hemipelagic claystone. This claystone contains Interfan A/B, a distributive lobe system that lies 10 m beneath Unit B, a sandstone-dominated succession that averages 150 m thickness and is interpreted to represent a toe of slope channelized lobe system. Unit B and the A/B interfan together comprise 4 depositional sequences in a composite sequence with an overall basinward-stepping stacking pattern, overlain by 30 m of hemipelagic claystone. The overlying 400 m thick submarine slope succession (Fort Brown Formation) is characterized by 10-120 m thick sand-prone to heterolithic packages separated by 30-70 m thick claystone units. On the largest scale the slope stratigraphy is defined by two major cycles interpreted as composite sequence sets. The lower cycle comprises lithostratigraphic Units B/C, C and D while the upper cycle includes lithostratigraphic Units D/E, E and F. In each case a sandy basal composite sequence is represented by an intraslope lobe (Units B/C and D/E respectively). The second composite sequence in each cycle (Units C and E respectively) is characterized by slope channel-levee systems with distributive lobes 20-30 km down dip. The uppermost composite sequence in each cycle (Units D and F respectively) are characterised by deeply entrenched slope valley systems. Most composite sequences comprise three sequences separated by thin (<5 m thick) claystones. Architectural style is similar at individual sequence scale for comparable positions within each composite sequence set and each composite sequence. The main control on stratigraphic development is interpreted as late icehouse glacio-eustasy but along-strike changes associated with changing shelf edge delivery systems and variable bathymetry due to differential substrate compaction complicate the resultant stratigraphy.  相似文献   

琼东南盆地陵水组层序格架及沉积体系的时空配置关系     

蔡佳  王华 《海洋地质译丛》2011,(1):16-21

利用层序地层学、沉积学原理和方法,对琼东南盆地古近系陵水组进行了层序划分和沉积体系时空配置关系的研究。建立了陵水组的层序地层格架,将其划分为Els3、ElS2和Elsl三个三级层序,其层序和体系域变化主要受控于凹陷内沉降中心的分布位置,沉积主要受控于盆地边缘的断坡带。每个三级层序低位体系域发育局限,海侵与高位体系域发育。沉积体系构成以扇三角洲、三角洲、滨海平原和浅海为主。探讨了沉积体系的演化,总结了其时空配置关系的特点。  相似文献   

Geological and geochemical prediction on deeply-seated ore-bodies in Haigou gold deposit of Jilin,China     

LI Xujun  FAN Zhenhua  FAN Wenliang  REN Shanfeng . College of Earth Sciences  Jilin University  Changchun  China  . Haigou Gold Mining Company Ltd.  Antu  Jilin 《东北亚地学研究》2011,(2)

Lode 28 is the largest gold-bearing quartz vein in Haigou gold deposit,and the lode itself contains more than 30t of gold. Geochemical study shows that 12 trace elements related gold mineralization can be divided into 5 metallogenic factors(element assemblages) .The high values of F1,F2 and F4 together indicate overlapped of multiple stages of gold mineralization,revealing high potential of gold mineralization at depth;the single high value of F4 represents the root of an existing ore body while high values...  相似文献   

L波段探空雷达维护维修技巧          下载免费PDF全文

赵育俊 《中低纬山地气象》2020,44(6):92-95

通过对武都气象观测站L波段探空雷达维护维修记录整理、归纳、分析,从中提炼出L波段探空雷达故障排查顺序和维护维修技巧,缩短维修时间,提高维修效率,供雷达机务工作者参考。  相似文献   

尼日尔三角洲盆地深水沉积的二元结构特征及层序划分     

王振奇 《地质学报》2013,87(8):1149-1157

本文根据测井曲线及地震相特征,建立了深水层序界面划分的5种判别标准,将尼日尔三角洲盆地深水区中中新统一上中新统地层划分了6个三级层序,2个二级层序.根据深水沉积自身沉积旋回所具有的二元结构特征及三角洲与陆架区相对海平面变化之间的关系,将经典的三分体系域划分为二分体系域:异地沉积体系域和原地沉积体系域.其中,异地沉积体系域从基准面下降开始海侵早期,主要发育重力流沉积(块状搬运沉积、浊积扇);原地沉积体系域从海侵中、晚期—基准面上升最大位置结束,主要以原地沉降的泥质披覆沉积为主.本文分析了层序发育的影响因素,综合研究认为:气候条件、海平面变化、构造抬升、沉积物供给、大陆架宽窄等共同制约了研究区深水沉积层序的发育.  相似文献   

水下分流河道砂体的叠置样式及其储层非均质性变化特征     

赵小庆  鲍志东  刘宗飞  柴秋会 《地质论评》2013,59(4):789-795

在研究区目的层进行高分辨率层序地层研究的基础上,对分流河道微相的储层质量非均质性进行分析,应用不同级次基准面旋回成因的沉积学分析和表征储层质量非均质性的各项岩芯化验、统计学数据定量分析,指出基准面旋回因素对不同级次水下分流河道主体储层质量非均质性影响存在差异:单一水下分流河道和单期复合水下分流河道的储层质量非均质性呈正韵律变化,多期复合水下分流河道储层质量非均质性分布呈不规则趋势,多级次的基准面旋回及其伴随的可容纳空间变化所引起的沉积环境的变化影响水下分流河道储层非均质性.  相似文献   

四川夏塞银铅锌多金属矿床1号矿体原生晕地球化学特征     

代力 《地质与勘探》2013,49(2):236-249

四川夏塞银铅锌多金属矿床位于西南"三江"义敦岛弧构造带中段,是与绒伊措岩体密切相关的浅成中低温热液型银铅锌矿床。对夏塞矿区1号矿体9个中段采样分析,通过数理统计分析、分带序列研究、地球化学参数计算、建立剥蚀模型等方法,系统详细地研究了矿体原生晕地球化学特征。研究表明:(1)1号矿体原生晕找矿的主要指示元素:Ag、Pb、Zn、Cu、Sb、Hg、Cd、Sn,次要指示元素:Bi、W、B、As、Au、Mn;(2)原生晕轴向分带序列为:Hg-Pb-Bi-Sn-Cd-Zn-Cu-As-Ag-W-Au-Sb-Ba-V-Mo-Mn,出现"反分带"现象;(3)成矿过程存在多次叠加,轴向地球化学参数变化曲折,出现多次转折,反应成矿过程复杂。综合各项特征,推测1号矿体深部可能有盲矿存在。  相似文献   

Sequences and biofacies packages in the mid‐Cenozoic Gambier Limestone,South Australia: Reappraisal of foraminiferal evidence     

Q. Li  B. McGowran  M. R. White 《Australian Journal of Earth Sciences》2013,60(6):955-970

The mid to outer neritic carbonates of the Gambier Limestone (Upper Eocene to lower Middle Miocene) can be divided into seven units by using criteria of sequence stratigraphy and foraminiferal biofacies. The boundaries fall mainly on erosional surfaces, even though the temporal duration of these surfaces appears to be largely beyond the resolution of foraminiferal biostratigraphy. The Eocene/Oligocene contact is distinctively unconformable in several sections, with at least part of the Upper Eocene sediments missing. Chert nodules, common to abundant in most sections, are associated with deep‐ or cool‐water benthic assemblages (> 100–200 m and <15°C), indicating cool, nutrient‐rich bottom conditions probably influenced by the Antarctic Circumpolar Current beginning during the Early Oligocene. The mid‐Oligocene fall in sea‐level was probably coupled with a major local uplift that removed at least part of the Lower Oligocene, an event widely recorded in the Australian‐New Zealand region. In areas weakly affected, this glacioeustatic lowstand is represented by chert‐free limestone and grey to pink dolomites in some sections, with a poorly preserved assemblage comprising few planktonic and deep‐water benthic species. Local unconformities separate regional unconformity‐bounded or allostratigraphic packages of strata to represent third‐order sequences. Although variations in local subsidence might have influenced accumulation space and sediment thickness, glacioeustatic influence on the packaging of the sequences and units of the Gambier Limestone was easily the more effective and concordant with the global patterns.  相似文献