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断层圈闭是斜坡区重要的构造圈闭类型,为了识别斜坡区断层圈闭发育部位及其形成时期,基于断层生长机制,分析斜坡区顺向断层圈闭和反向断层圈闭形成演化过程。结果表明：顺向断层圈闭形成于断层"硬连接"阶段,发育在断层下降盘分段生长部位;反向断层圈闭形成于断层开始活动时期,发育在断层上升盘位移最大部位。在此基础上,充分利用详细三维地震资料,结合断距-距离曲线、相干体切片、断层分段生长时期定量表征以及断距回剥等技术,建立了斜坡区断层圈闭发育部位及形成时期的识别方法,并将该方法应用于冀中坳陷文安斜坡典型断层圈闭发育部位及形成时期的识别,研究结果与实际油气分布吻合关系较好。 相似文献
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松东凹陷位于琼东南盆地东北部,是受琼东南盆地6号断裂控制、总体呈南断北超的新生代凹陷。松东凹陷断裂复杂,理清断裂的发育特征有助于加深对琼东南盆地区域构造演化的认识,具有重要油气地质意义。基于近几年新采集的地震资料,结合区域地质背景,从剖面上和平面上多方位对松东凹陷的各种类型断层进行了系统解释和厘定,分析了断裂的组合样式、活动期次、发育规律及展布特征。结果表明:松东凹陷单条断层剖面上多呈犁式、平直式,多条断层组合常呈复合"Y"字形、羽状、帚状和网状;平面上单条断层多为弧形、直线形,多条断层组合常呈帚状、斜交式和平行式;松东凹陷断层按期次可划分为始新世NE向、渐新世近EW向和中新世NWW向三组,NE向断层控制松东凹陷的边界及其内部次级构造,渐新世近EW向断层和中新世NWW向断层组合形成六组断裂带成排分布,并伴有多条近SN向走滑断层发育;松东凹陷不同期次断裂的发育是区域应力场伸展方向随时间发生顺时针旋转的结果。结合松东凹陷的断裂发育特征和成因机制分析,最终认为该区断裂对油气成藏起到控烃源、控运移和控圈闭的作用,SN向走滑断层周缘以及构造变换带是油气成藏有利位置。 相似文献
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孤南洼陷是一个复合的半地堑盆地 ,洼陷斜坡发育由断层和断块构成的断阶构造样式 ,其中一种为反断阶。反断阶的发育使得盆地斜坡的沉积地形复杂化 ,因此发育其上的砂质沉积体具有特殊的分布型式 ,包括展布方向、几何形态和水流特征。孤南凸起东南斜坡的反向断阶是由一正断层和倾向相反的斜坡构成。斜坡总体向盆内倾斜 ,但在断层处形成一个次级隆起。沙河街组二段的砂体是在这样的复合地形上沉积并赋存下来。在平面上该砂体一方面沿沉积斜坡方向延伸至断层 ,一方面沿断层走向延伸或越过断层 ,呈不规则的丁字形。砂体在越过孤南洼陷与孤岛凸起的分界断层后在远端发散 ,形成扇体。 相似文献
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鄂尔多斯盆地东南缘大宁-吉县地区煤层气资源丰富,对该区成煤后中新生代构造及其演化的认识,有利于煤层气勘探与开发的有效开展.基于区域构造演化特征,运用构造地质学的研究方法,对该区勘查资料和野外节理测量数据进行分析处理,阐释研究区构造特征及其演化.结果表明:大宁-吉县地区整体表现为向NWW缓倾的单斜,中部及东南边缘被走向NE和NNE为主体的宽缓褶皱和断层复杂化,依据构造差异将研究区划分为盆缘断褶、斜坡凹隆和西部缓坡三个构造带,盆缘及中部凹隆构造复杂,节理发育密集,构造变形弱的西部缓坡和中部斜坡带为节理发育低密度区;大宁-吉县地区晚古生代煤系受燕山运动改造最为显著,该期构造应力场以NW-SE向挤压为显著特征,是形成区内主体构造格局的关键期,喜马拉雅期构造应力场转变为NE-SW向挤压,对研究区构造变形的影响主要表现在叠加改造先期NE和NEE向断层和节理构造,印支期影响不明显. 相似文献
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简单斜坡油气富集规律——以松辽盆地西部斜坡北段为例 总被引：16，自引：0，他引：16
斜坡是断陷和凹陷型盆地的重要构造单元,按其断裂发育程度和沉积厚度分为复杂斜坡和简单斜坡。松辽盆地西部斜坡为断裂不发育、平缓的简单斜坡,简单斜坡油气成藏有特殊性,表现在三个方面：一是简单斜坡的原油主要来自临近的凹陷,油气沿砂体以优势路径方式侧向运移,油气呈“线状”分布;二是简单斜坡大规模构造圈闭不发育,圈闭类型以地层、岩性和构造-岩性圈闭为主,其分布受构造带控制,超覆带发育岩性上倾尖灭圈闭,受规模较大的断层控制形成的鼻状构造带上发育断层遮挡和构造-岩性圈闭,不受断层控制的鼻状构造带主要发育构造-岩性圈闭。三是简单斜坡普遍受大气水的淋滤作用,由于游离氧的进入使原油遭受氧化降解作用而稠化,造成简单斜坡稠油分布普遍。这种成藏的特殊性决定了油气富集规律：只有位于油气运移路径上的圈闭才有成藏的可能。简单斜坡油气勘探方向是,在油气运移路径上寻找低幅度构造背景下的岩性油气藏（小规模）、规模较大断层附近寻找断层遮挡油气藏（中等规模）和地层超覆带上寻找岩性上倾尖灭油气藏（大规模）。 相似文献
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本文通过对苏丹—南苏丹Muglad盆地盆地结构、构造演化、构造特征、主要圈闭类型、不同类型反向断块圈闭形成机制等研究,深入探讨了Muglad盆地构造对油气成藏的控制作用。研究表明,反向断块圈闭是Muglad盆地最主要的圈闭类型,而主力产油区块1、2、4区主要发育两种类型的反向断块圈闭。一种是古隆起及斜坡区应力调节作用下的反向断块圈闭,该类型反向断块圈闭构造背景相对稳定,加之斜坡或古隆起区有利于油气聚集,是研究区最有利的成藏构造。另一种为凯康槽两侧同沉积断裂带内因中非剪切带走滑扭动作用形成的局部反向断块圈闭,该类型反向断块圈闭受凯康槽边界断裂多期强烈活动影响具有保存难、不易成藏的特点。另外,凯康槽两侧盆地结构及构造演化差异进一步决定了油气平面富集差异。凯康槽东侧Shelungo、Bamboo和Unity隆起带的发育及相对稳定的构造背景为油气富集创造了良好的圈闭和保存条件;而凯康槽西侧不发育类似的隆起带,由西部斜坡和西部断阶带组成。西部斜坡反向断层不发育,西部断阶带多期强烈活动使得凯康槽西侧油气发育程度整体不如东侧。受西部断阶带的多期改造,西部斜坡区具有多层系成藏的特点。 相似文献
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基于高精度三维地震解释和相干属性分析,发现琼东南盆地北礁凹陷三维区中新统三亚组、梅山组、黄流组发育大量多边形断层。梅山组顶面发育呈近EW向展布的长条形丘和丘间底流水道,其上方分别发育近EW向(多边形)断层密集带和近SN向横截水道(多边形)断层。北部泥岩区,丘规模越大,断层密集带越宽,断层密集带主要分布在黄流组下部和梅山组上段地层中,横截底流水道断层向上延伸较短,向下延伸至梅山组或三亚组,而梅山组至三亚组多边形断层逐渐呈现多边形形态。西南部砂岩区,黄流组底部断层密集带和横截水道断层比北部规模小,延伸短,梅山组下段发育近NE向横截浊积水道砂岩断层和近NW向平行浊积水道边界断层,其规模更小。重力扩展可以很好地解释黄流组断层密集带和横截底流水道断层的形成,梅山组和三亚组的多边形断层是超压水力破裂的结果,同时大颗粒砂岩抑制多边形断层的形成。在我国首次发现断层密集带和横截水道断层,该类断层对油气运移、识别强振幅地质体和丘形反射成因具有重要的意义。 相似文献
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大梁子富锗铅锌矿床位于扬子板块西南缘,是四川-云南-贵州(川滇黔)铅锌矿集区大型矿床之一,其矿石储量4.5 Mt,Pb+Zn平均品位10%~12%,矿体主要以筒状、脉状赋存于严格受断裂构造控制的富有机质破碎带“黑色破碎带”中,赋矿围岩为震旦系灯影组的白云岩。矿区断裂十分发育,主要发育NWW向断裂、NW向断裂和NE向断裂。通过详细分析各组断裂的几何学和运动学特征,厘清了成矿前、成矿期和成矿后断裂活动特征及构造动力学特征。成矿前,该矿区受近N-S向挤压应力作用,形成NWW向逆断层;成矿期,受古特提斯洋的俯冲消减和碰撞造山作用,研究区构造应力场转变为NW-SE向挤压应力,形成矿区的NWW向张扭性断层、NW向扭张性断层和NE向逆断层;成矿后,区域构造应力场转变为近EW向,形成NWW向、NW向和NE向的破矿断裂。NWW向断裂是矿区的主控断裂,是流体运移的通道;NW向断裂是NWW向断层的主要配套断裂,是流体混合和矿体就位的空间,NWW向断裂和NW向断裂组成的负花状构造是大梁子富锗铅锌矿床最具特色的控矿构造样式。来自深部的富金属离子的流体与来自寒武系富有机质地层的还原型流体在NWW向断裂和NW向断裂控制的张裂空间的混合,是该床的主要成矿机制。矿区南部和西部类似的构造样式区是下一步找矿的方向。 相似文献
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Emily Keeble David I. Whiteside Michael J. Benton 《Proceedings of the Geologists' Association. Geologists' Association》2018,129(2):99-119
Pant-y-ffynnon Quarry in South Wales yielded a rich cache of fossils in the early 1950s, including articulated specimens of new species (the small sauropodomorph dinosaur Pantydraco caducus and the crocodylomorph Terrestrisuchus gracilis), but no substantial study of the wider fauna of the Pant-y-ffynnon fissure systems has been published. Here, our overview of existing specimens, a few described but mostly undescribed, as well as freshly processed material, provides a comprehensive picture of the Pant-y-ffynnon palaeo-island of the Late Triassic. This was an island with a relatively impoverished fauna dominated by small clevosaurs (rhynchocephalians), including a new species, Clevosaurus cambrica, described here from a partially articulated specimen and isolated bones. The new species has a dental morphology that is intermediate between the Late Triassic Clevosaurus hudsoni, from Cromhall Quarry to the east, and the younger C. convallis from Pant Quarry to the west, suggesting adaptive radiation of clevosaurs in the palaeo-archipelago. The larger reptiles on the palaeo-island do not exceed 1.5?m in length, including a small carnivorous crocodylomorph, Terrestrisuchus, and a possible example of insular dwarfism in the basal dinosaur Pantydraco. 相似文献
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Gilles Serge Odin 《Comptes Rendus Geoscience》2002,334(6):409-414
Lithostratigraphy, physicochemical stratigraphy, biostratigraphy, and geochronology of the 77–70 Ma old series bracketing the Campanian–Maastrichtian boundary have been investigated by 70 experts. For the first time, direct relationships between macro- and microfossils have been established, as well as direct and indirect relationships between chemo-physical and biostratigraphical tools. A combination of criteria for selecting the boundary level, duration estimates, uncertainties on durations and on the location of biohorizons have been considered; new chronostratigraphic units are proposed. The geological site at Tercis is accepted by the Commission on Stratigraphy as the international reference for the stratigraphy of the studied interval. To cite this article: G.S. Odin, C. R. Geoscience 334 (2002) 409–414. 相似文献
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The effect of water on accessory phase solubility in subaluminous and peralkaline granitic melts 总被引：4，自引：0，他引：4
The solubilities of columbite, tantalite, wolframite, rutile, zircon and hafnon were determined as a function of the water contents in peralkaline and subaluminous granite melts. All experiments were conducted at 1035 °C and 2 kbar and the water contents of the melts ranged from nominally dry to approximately 6 wt.% H2O. Accessory phase solubilities are not affected by the water content of the peralkaline melt. By contrast, solubilities are affected by the water content of the subaluminous melt, where the solubilities of all the accessory phases examined increase with the water content of the melt, up to 2 wt.% H2O. At higher water contents, solubilities are nearly constant. It can be concluded that water is not an important control of accessory phase solubility, although the water content will affect diffusivities of components in the melt, thus whether or not accessory phases will be present as restite material. The solubility behaviour in the subaluminous and peralkaline melts supports previous spectroscopic studies, which have observed differences in the coordination of high field strength elements in dry vs. wet subaluminous granitic glasses, but not for peralkaline granitic glasses. Lastly, the fact that wolframite solubility increases with increasing water content in the subaluminous melt suggests that tungsten dissolved as a hexavalent species. 相似文献
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Emmanuel Skourtsos Daniel Vachard Alexandra Zambetakis-Lekkas Rossana Martini Louisette Zaninetti 《Comptes Rendus Geoscience》2002,334(12):925-931
Some olistolites reworked in a Tertiary flysch of Mount Parnon (Peloponnesus, Greece) exhibit a Late Permian assemblage, dominated by Paradunbarula (Shindella) shindensis, Hemigordiopsis cf. luquensis and Colaniella aff. minima. This association corresponds to the Late Wuchiapingian (=Late Dzhulfian), a substage whose algae and foraminifera are generally little known. Contemporaneous limestones crop out in the middle part of the Episkopi Formation in Hydra, but they are rather commonly reworked in Mesozoic and Cainozoic sequences. The palaeobiogeographical affinities shared by the foraminiferal markers of Greece, southeastern Pamir, and southern China, are very strong (up to the specific level), and are congruent with the Pangea B reconstructions. To cite this article: E. Skourtsos et al., C. R. Geoscience 334 (2002) 925–931. 相似文献
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正20141596 Liu Yunhuan(School of Earth Sciences and Resources,Chang’an University,Xi’an 710054,China);Shao Tiequan Early Cambrian Quadrapyrgites Fossils of Xixiang Boita in Southern Shaanxi Province(Journal of Earth Sciences and Environment,ISSN1672-6561,CN61-1423/P,35(3),2013,p.39-43,3 illus.,20 refs.) 相似文献
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正20141719 Chen Zhijun(State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China);Chen Jianguo Automated Batch Mapping Solution for Serial Maps:A Case Study of Exploration Geochemistry Maps(Journal of Geology,ISSN1674-3636,CN32-1796/P,37(3),2013,p.456-464,2 illus.,2 tables,10 refs.) 相似文献
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正20140962 Chen Fenning(Xi’an Institute of Geology and Mineral Resources,Xi’an710054,China);Chen Ruiming Late Miocene-Early Pleistocene Ostracoda Fauna of Gyirong Basin,Southern Tibet(Acta Geologica Sinica,ISSN0001-5717,CN11-1951/P,87(6),2013,p.872-886,6illus.,56refs.) 相似文献
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正1.IGNEOUS PETROLOGY20142008Cai Jinhui(Wuhan Center,China Geological Survey,Wuhan 430205,China);Liu Wei Zircon U-Pb Geochronology and Mineralization Significance of Granodiorites from Fuzichong Pb-Zn Deposit,Guangxi,South China(Geology and Mineral Resources of South China,ISSN1007-3701,CN42-1417/P,29(4),2013,p.271-281,7illus., 相似文献
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正20141205Cheng Weiming(State Key Laboratory of Resources and Environmental Information System,Institute of Geographic Sciences and Natural Resources Research,CAS,Beijing 100101,China);Xia Yao Regional Hazard Assessment of Disaster Environment for Debris Flows:Taking Jundu Mountain,Beijing as an 相似文献
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正20141266Fan Chaoyan(Guangdong Provincial Key Laboratory of Mineral Resources and Geological Processes,Guangzhou 510275,China);Wang Zhenghai On Error Analysis and Correction Method of Measured Strata Section with Wire Projection Method(Journal of 相似文献