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利用镜质体反射率资料及其定量恢复的合肥盆地的古地温结合伊利石结晶度测定系统研究了盆地石炭-二叠系以来的热演化史,在此基础上分析了石炭-二叠系、下侏罗系、中上侏罗系、白垩系、古近系的烃源岩有机质的热演化程度及热演化史,结果表明合肥盆地C-P系呈现为高成熟阶段,并在下侏罗统沉积之后开始进入生油门限,在上侏罗统沉积后地温曾达245℃,而在白垩纪中期(朱巷组沉积后)最大古地温度达到过305℃指示进入了过成熟阶段。下侏罗统防虎山组Ro值和伊利石结晶度也显示了较高的热演化程度,在中侏罗统沉积后开始进入生油门限,在早白垩世朱巷组沉积后达到了最高的热演化程度,最大古地温达260℃。中-上侏罗统随着下白垩统朱巷组的沉积而进入生油门限,在下白垩统沉积之后达到了最大的古地温度,分别为225℃、230℃,指示开始进入过成熟阶段,朱巷组最大埋藏温度出现在早白垩世末,达到了110～120℃,指示进入了成熟期。在上覆古近系沉积后曾达到最大古地温(110～160℃),显示进入了成熟阶段。古近系定远组未进入成熟阶段,最大古地温出现在定远组沉积之后,但小于50℃。 相似文献
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羌塘盆地羌资5井二叠系展金组烃源岩基本特征 总被引：2，自引：1，他引：1
前人对羌塘盆地的烃源岩研究资料主要来源于中生界地表露头,少见古生界的。对羌资5井二叠系展金组烃源岩的钻井岩心研究表明,其有机碳含量高,平均值达到1.15%,属于好烃源岩。干酪根显微组分主要为Ⅲ型,其次为Ⅱ2型;有机质主要来自于海相低等水生生物,热演化已达到成熟阶段。烃源岩具较好的生气能力。认为井下烃源岩样品虽显示其处于有机质演化成熟阶段,但因受后期构造抬升的影响,推测二叠系深部未知的烃源岩可能尚处于高成熟—过成熟阶段。羌塘盆地二叠系具有较好的勘探前景,油气勘探可向深部古生界开展。 相似文献
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《中国煤炭地质》2020,(6)
以四川盆地西南缘之滇东北地区地质演化特征为基础,通过综合分析研究区构造性质、活动范围、演化历史、持续强度及与之对应的物质基础、有机质热演化史等因素,选定研究区页岩气有利勘查区为木杆向斜盆地东南侧至东南部的斑竹林向斜区域。通过钻井验证测试,选区优质页岩厚度较大(厚60～80m)且连续稳定、发育及保存良好、有机质含量高(TOC 0.90%～4.43%,平均2.04%)、成熟度适中(T_(max)在400～600℃,最高571.60℃,Ro2.0%),脆性矿物含量较高且黏土矿物含量较低,孔隙度、含气性测试优良,显示研究区较好的页岩气勘探潜力。综合研究认为地质构造演化对有机质页岩气成藏具重要影响。 相似文献
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地层剥蚀量是沉积盆地埋藏史和热史重建中一个关键的参数.本文利用石油钻井的系统古温标(Ro)资料,并结合多种恢复方法,得出四川盆地主要构造运动时期的剥蚀量.研究表明:加里东期,川东南剥蚀量较大,达2000m.东吴运动时期,川西南、川东南等距二叠纪玄武岩喷发区较近地区的剥蚀量较大,分别在260～450 m和800～900m:印支早期盆地整体遭受了抬升剥蚀作用,剥蚀厚度为100～500 m.印支中、晚期龙门山地区褶皱剥蚀,H1、Y1等钻井该时期的地层剥蚀量超过2000 m.燕山期周缘山系的继续隆升造成山前大范围地区的剥蚀:喜山期盆地周缘钻井的剥蚀量较大,在2000 m左右,而早期古隆起上的钻井如GJ、J13、Z12等钻井的地层剥蚀量则较小,在1000 m左右.可见,四川盆地不同地质时期及不同构造区位的剥蚀厚度都不尽相同,这一时空差异反映了构造运动对该区的差异影响.这一研究也表明,以系统的古温标资料(R_o)为基础,针对不同地质情况选用适当的反演方法并结合多种反演方法.能有效地恢复钻井在不同时期的剥蚀量.上述四川盆地各时期剥蚀地层厚度的恢复,对研究该区的构造、沉积和油气演化提供了基础数据. 相似文献
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塔里木陆块西北缘萨热克砂岩型铜矿床构造演化、流体演化与成矿之间具有密切关系,处于一个统一系统中。矿床成岩期方解石中包裹体水的δD值为-65.3‰~-99.2‰,改造成矿期石英包裹体水的δD值为-77.7‰~-96.3‰,成岩成矿期成矿流体δ~(18)OH_2O变化范围为-3.22‰~1.84‰,改造成矿期成矿流体δ~(18)OH_2O变化范围为-4.26‰~5.14‰,指示萨热克铜矿成岩期、改造期成矿流体主要为中生代大气降水及其经水岩作用而成的盆地卤水。矿石中辉铜矿δ~(34)S值为-24.7‰~-15.4‰,指示硫主要源自硫酸盐细菌与有机质还原,部分源于有机硫。构造与成矿流体演化对砂岩铜矿成矿起关键制约作用。盆地发展早期强烈的抬升运动使盆地周缘基底与古生界剥蚀,为富铜矿源层的形成提供了丰富物源,至晚侏罗世盆地发展晚期,长期演化积聚的巨量含矿流体在库孜贡苏组砾岩胶结物及裂隙中富集,在萨热克巴依盆地内形成具有经济意义的砂岩型铜矿床。 相似文献
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莺－琼盆地具有高温、超压以及强烈的流体活动等独特的流体动力学特征。综合利用研究区的地质、地球化学、钻井及地层测试等资料，对莺－琼盆地的温度场、压力场进行了研究；分析表明，活动热流体有利于促进有机质的热演化和烃类的生成；超压对有机质的成熟起抑制作用，从而可减缓超压层段内有机质的成熟速率，拓宽生烃窗的范围；在此基础上总结出莺－琼盆地在独特的流体动力学背景下的成烃模式。 相似文献
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歧口凹陷沙河街组成岩史分析和成岩阶段预测 总被引：20，自引：7，他引：13
渤海湾盆地歧口凹陷超压对有机质热演化、有机酸生成和水岩反应具有明显的抑制作用。在化学动力学模型中加入超压因子增加反应活化能,即可用于超压条件下有机质热演化和成岩作用的模拟。歧口凹陷深层(>3500m)主要为沙河街组(始新—渐新世)。在沙河街组沉积末期沙河街组三段(沙三段)就进入晚成岩阶段A1期,烃源岩开始生烃,生、储、盖层发育史与圈闭发育史匹配良好,油气藏开始形成。在东营组沉积时期(渐新世)—新近纪,沙河街组大部分地层处于晚成岩阶段A1—A2期,是其主要成藏期。现今沙河街组一段、二段和三段的上部仍处于晚成岩阶段A1—A2期,有利于油气藏的形成。然而,沙三段的下部在歧口凹陷的北部地区已进入晚成岩阶段BC期,镜质组反射率Ro≥1.3%,烃源岩处于高过成熟阶段,储层物性较差,不利于成藏,但在南部地区的沙三段下部还处于晚成岩阶段A1-A2期,生、储、盖层发育,是油气聚集的有利地区。 相似文献
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对合肥盆地中部肥西县打子塘地区圆筒山组砂岩（J2y）的磷灰石裂变径迹（AFT）分析表明,其FT年龄为（32.5±2.4）Ma（22个颗粒的平均）,明显小于其地层的年龄（176～168 Ma）;围限径迹长度为（12.43±0.18）μm（126个径迹长度的平均值）,为单峰式分布。模拟热史主要为5段：距今176～152 Ma,冷却速率为-21.4℃/Ma;距今152～85 Ma,冷却速率为-0.1℃/Ma;距今85～32 Ma,冷却速率为1.4℃/Ma;距今32～10 Ma,冷却速率为1.6℃/Ma;10 Ma至今,冷却速率为5.0℃/Ma,这5个阶段分别对应了沉积物快速沉降加热、盆地趋于构造热稳定、盆地较快速抬升冷却和快速抬升冷却等演化阶段。沉积物快速加热阶段（176～152 Ma）反映了大别造山晚期山根拆沉阶段与盆地挤压、快速沉降和加热作用,构造热稳定阶段（152～85 Ma）反映了大别造山带热隆伸展和岩浆作用,冷却阶段（85～25 Ma）代表了郯庐断裂的走滑拉张作用与区域性断陷伸展（K2—E）取代热隆伸展体制与早白垩世的岩浆活动。最后一阶段（25 Ma以来）则为合肥盆地的挤压抬升、快速剥露阶段。 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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Muriel Rocher Stéphane Baize Stéphane Jaillet Edward Marc Cushing Yannick Lozac&#x;h Francis Lemeille 《Comptes Rendus Geoscience》2003,335(8):701-708
Calcite samples were extracted both from the rock matrix and the superficial coating of a karstified fault plane of an underground quarry, located in the eastern border of the Paris basin. The karstification is dated as Quaternary. Analysis of mechanical calcite twinning reveals that only the calcite matrix has also undergone a compression trending WNW that can be attributed to the Mio-Pliocene alpine collision. Both coating and matrix have undergone a strike-slip regime with σ1 roughly trending north–south, that could correspond to the regional present-day state of stress, a strike-slip compression rather trending NNW, modified by local phenomena. To cite this article: M. Rocher et al., C. R. Geoscience 335 (2003). 相似文献
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正20141520 Bo Ying(Key Laboratory of Metallogeny and Mineral Assessment,MLR,Beijing 100037,China);Liu Chenglin Saline Spring Hydrochemical Characteristics and Indicators for Potassium Exploration in Southwestern and Northern Tarim Basin,Xinjiang(Acta Geoscientica Sinica,ISSN1006-3021,CN11-3474/P,34(5),2013,p.594-602,5 illus.,3 tables,28 refs.) 相似文献
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正20141243Chen Ge(Hangzhou Research Institute of Petroleum Geology,PetroChina,Hangzhou 310023,China);Si Chunsong Study on Sedimentary Numerical Simulation Method of Fan Delta Sand Body(Journal of Geology, 相似文献
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正20142599Chen Sanming(Guangxi Key Laboratory of Concealed Deposits Exploration,Guilin University of Technology,Guilin541004,China);He Yuzhou Block Model and Reserves Estimation of Panzhihua Iron Deposit Based on 3D Geological Modeling(Journal of Guilin University of Technology,ISSN1674-9057,CN45-1375/N,33(4),2013,p.610-615,9illus.,1table,15refs.) 相似文献
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正20140594 Bai Daoyuan(Hunan Institute of Geology Survey,Changsha 410016,China);Zhong Xiang Faults in the Jingzhou Basin and Their Tectonic Settings(Geotectonica et Metallogenia,ISSN1001-1552,CN44-1595/P,37(2),2013,p.173-183,6illus.,59refs.)Key words:basin evolution,tectonic setting,South China In the Upper Paleozoic and Jurassic se- 相似文献
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正20141912Cao Hui(State Key Laboratory for Continental Tectonics and Dynamics,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China)Gravitational Collapse and Folding during Orogenesis:A Comparative Study of FIA Trends and Fold Axial Plane Traces(Geology in China,ISSN1000-3657,CN11-1167/P,40(6),2013,p.1818-1828,9illus.,35refs.,with 相似文献