准噶尔盆地西北缘三叠系层序地层与隐蔽油气藏勘探   总被引：3，自引：0，他引：3  

鲜本忠  徐怀宝  金振奎  王春生  鲁阳  黄立良 《高校地质学报》2008,14(2)

层序地层学及层序地层原理指导下的地震资料解释为地层、岩性油气藏勘探提供了理论和技术支持。为配合准噶尔盆地西北缘油气勘探从克乌断裂带上盘向下盘、从构造油气藏向地层、岩性等隐蔽油气藏的转变,利用陆相层序地层学理论和地球物理资料,将三叠系划分为1个二级层序、5个三级层序和8个体系域,进而总结出拗陷完整型和拗陷残缺型两种层序类型。结合测井约束地震反演和井间沉积对比,探讨了三叠系砂体结构和湖侵体系域地层超覆、湖退体系域及最大湖泛面附近小规模滑塌浊积体岩性透镜体等5种圈闭发育模式。油气成藏综合条件分析指出有效圈闭和油源断层的识别是制约斜坡带岩性油气藏勘探的关键。  相似文献   

Tectonics of the Simplon massif and Lepontine gneiss dome: deformation structures due to collision between the underthrusting European plate and the Adriatic indenter   总被引：1，自引：0，他引：1  

Albrecht Steck 《Swiss Journal of Geoscience》2008,101(2):515-546

This study presents a review of published geological data, combined with original observations on the tectonics of the Simplon massif and the Lepontine gneiss dome in the Western Alps. New observations concern the geometry of the Oligocene Vanzone back fold, formed under amphibolite facies conditions, and of its root between Domodossola and Locarno, which is cut at an acute angle by the Miocene, epi- to anchizonal, dextral Centovalli strike-slip fault. The structures of the Simplon massif result from collision over 50 Ma between two plate boundaries with a different geometry: the underthrusted European plate and the Adriatic indenter. Detailed mapping and analysis of a complex structural interference pattern, combined with observations on the metamorphic grade of the superimposed structures and radiometric data, allow a kinematic model to be developed for this zone of oblique continental collision. The following main Alpine tectonic phases and structures may be distinguished:

1.	NW-directed nappe emplacement, starting in the Early Eocene (~50 Ma);
2.	W, SW and S-verging transverse folds;
3.	transpressional movements on the dextral Simplon ductile shear zone since ~32 Ma;
4.	formation of the Bergell – Vanzone backfolds and of the southern steep belt during the Oligocene, emplacement of the mantle derived 31–29 Ma Bergell and Biella granodiorites and porphyritic andesites as well as intrusions of 29–25 Ma crustal aplites and pegmatites;
5.	formation of the dextral discrete Rhone-Simplon line and the Centovalli line during the Miocene, accompanied by the pull-apart development of the Lepontine gneiss dome – Dent Blanche (Valpelline) depression.

It is suggested that movements of shortening in fan shaped NW, W and SW directions accompanied the more regular NW- to WNW-directed displacement of the Adriatic indenter during continental collision.

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Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorized users. Editorial Handling: Stefan Bucher  相似文献   

大陆岩石圈对扩张机制的响应—辽蒙地质走廊中—新生代火山活动的时空分布   总被引：1，自引：0，他引：1  

邵济安  季建清  路凤香  张履桥 《地质通报》2008,27(9):1431-1440

选择辽西为中心,以近东西向延伸800km的辽蒙地质走廊为研究区,通过年代学研究,确认130Ma以来的中、新生代火山活动对称分布的时空格局,具有“中间老、两侧新”的特点,而且随着时间的推移,软流圈来源的岩浆向东西两侧侧向流动,岩浆来源不断加深。在此基础上提出“软流圈底辟体上涌和水平侧向流动”的模式。  相似文献   

演化中的裂谷带——五大连池火山岩带   总被引：7，自引：0，他引：7  

绍济安  张文兰 《地学前缘》2008,15(6):241

小古里河—科洛—五大连池—二克山新生代火山岩带是一条富钾火山岩带。文中重点论述了以下4点内容:(1)火山岩及其包体中存在典型的地幔交代作用;(2)根据火山岩K2O/Na2O比值勾画出富钾火山岩带范围;(3)地幔气体的绝热膨胀导致"冷泉和冻土现象";(4)地震活动的现状。论证了NNW走向的五大连池火山岩带是新生代初始的大陆裂谷,它们切穿了大兴安岭北北东向构造带。进一步从岩浆演化的趋势认为五大连池裂谷带将持续演化而不会夭折。  相似文献   

The　Epi－continental　arc　of　Southeast　China　and　relevant　earthquakes     

徐嘉炜 《地震学报(英文版)》1996,9(4):565-571

ＴｈｅＥｐｉ┐ｃｏｎｔｉｎｅｎｔａｌａｒｃｏｆＳｏｕｔｈｅａｓｔＣｈｉｎａａｎｄｒｅｌｅｖａｎｔｅａｒｔｈｑｕａｋｅｓＪＩＡ－ＷＥＩＸＵ（徐嘉炜）ＤｅｐａｒｔｍｅｎｔｏｆＲｅｓｏｕｒｃｅａｎｄＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｃｅｓ,ＨｅｆｅｉＵ...  相似文献   

大别山榴辉岩一片麻岩杂岩的成因   总被引：2，自引：1，他引：1  

刘晓春 《地球化学》1994,(4)

大别山榴辉岩由辉长岩、大陆拉斑玄武岩和少量泥灰质经高压变质作用形成。大别地块可划分出四个形成条件不同的榴辉岩区,它们代表一种构造－岩石组合体。片麻岩杂岩中各种高压变质岩类的发现证明它们与榴辉岩一起经历了原地高压变质过程。二者变质作用Ｐ－Ｔ参数的差异归因于抬升过程中退变质反应速度的不同。不同地区榴辉岩退变质组合及Ｐ－Ｔ条件与围岩的一致性表明,大别杂岩现今所展示的“递增”变质带是由榴辉岩相退变质作用形成的。高压榴辉岩－片麻岩杂岩的产生是印支期扬子与华北两个大陆板块碰撞的结果。  相似文献   

“全新特提斯洋”概念与广义特提斯构造域     

余星  许绪成  韩喜球  丁巍伟  胡航  何虎  余娅娜 《地质学报》2022,96(12):4131-4139

特提斯最初是指欧亚大陆南缘的古海洋，后逐渐引申出从元古宙、古生代到中生代的一系列位于劳亚大陆与冈瓦纳大陆之间的古大洋，如原特提斯洋、古特提斯洋和新特提斯洋，不同大洋在时间上前后交叠。如今横亘在冈瓦纳大陆(南极洲)和欧亚大陆之间的是印度洋，是新特提斯洋的继承者，可以另称为“全新特提斯洋”。这一概念的引申直接体现了印度洋与特提斯构造域一脉相承的关系，有助于将今论古、由此及彼，更直观地了解特提斯构造域的演化过程。本文按时间序列梳理了印度洋的大地构造演化和岩浆作用过程，识别了印度洋在155 Ma、120 Ma、90~84 Ma、76 Ma、65 Ma、52 Ma、45 Ma、38 Ma等关键时期的异常海底扩张记录，这些扩张事件将为标定新特提斯构造域的演化提供参照。其中155 Ma可能指示了新特提斯洋的鼎盛期，90 Ma指示了新特提斯洋的洋中脊俯冲，76~52 Ma是非洲- 阿拉伯大陆与欧亚大陆初始碰撞- 主碰撞(即新特提斯洋西部关闭)的时期，65~45 Ma是印度次大陆与欧亚大陆初始碰撞- 主碰撞(即新特提斯洋中部关闭)的时期，38 Ma是澳大利亚北部大洋开始净俯冲(即新提斯洋东部开始消减)的时间。印度洋扩张历史的研究为理解新特提斯洋消亡提供参考标尺。站在“后方”印度洋的角度，可以更清晰地透视“前线”特提斯构造域的演化过程，为理解板块构造活动规律提供支撑。  相似文献   

High-resolution sequence stratigraphy of the Lower Triassic ‘Buntsandstein’ in the Netherlands and northwestern Germany     

Geluk  M.C.  Röhling  H.-G. 《Geologie en Mijnbouw》1997,76(3):227-246

Detailed log correlations of the largely fluvio-lacustrine Lower Triassic Buntsandstein (Late Permian-Early Anisian), carried out on 80 wells in the Dutch onshore and offshore areas, can be linked to northwest-German high-resolution sequence stratigraphy. The correlations show that cyclic sedimentation occurred in large parts of the basin. Seven 1st-order sequences are recognised, namely the Main Claystone, Rogenstein, Volpriehausen, Detfurth, Hardegsen, Solling and Lower Röt Sequences. They are overlain by the lower part of the Upper Röt–Lower Muschelkalk Sequence. Distinct sequence boundaries have been identified at the bases of four sequences: Volpriehausen, Detfurth, Solling and Upper Röt. The higher-order sequences consist of fining-upwards cycles with a thickness of up to tens of metres. The sequences are laterally persistent and have a characteristic expression on gamma-ray and sonic logs. In the Lower Buntsandstein, they display a uniform character throughout most of the area, with only minor differences in thickness or lithology. NNE-oriented lows and swells were formed during deposition of the Volpriehausen, Detfurth and Hardegsen Sequences. Uplift prior to the deposition of the Solling Sequence caused deep erosion on the swells in the basin and minor erosion in the lows. The high-resolution sequences probably represent alternating, relatively wet and dry climatic periods, with a periodicity of about 100 000 years. An analysis of the sequences suggests that their reduced thickness on the swells is mainly the effect of erosion. This is supported by analyses of the accumulation patterns and rates.  相似文献   

Sedimentary Features of Shallow Ancient River Channels on the Northern Shelf of the South China Sea   总被引：1，自引：0，他引：1  

Kou Yangqi  Du Deli nd Marine Geological Investigation Party  MGMR  Guangzhou  Guangdong Jiang M inxi 《《地质学报》英文版》1995,69(1)

Quaternary buried ancient river channels are widespread in the shallow-level sediments of the northern shelf of the South China Sea. The sedimentary sequence mainly of fluvial deposits comprise an important component part of the low-stand system tract and transgressive system tract in the study region. The plannar variation and spatial association of the sedimentary features such as incised valley fillings, deltaic foreset wedges and block slides of shelf-marginal fans reflect the palaeogeographic environment during the fall of the regional sea level in the northern part of the South China Sea. Based on the high-resolution seismic reflection data and gelogical data from boreholes, the present paper makes an integrated interpretation of the Quaternary ancient river channels in the shallow sediments of the study area, studies the sedimentary features of the ancient channels such as their spatial distribution, seismic facies reflection indicators, sedimentary facies and sand -body types, and discusses thei  相似文献   

3-D seismic structure of the source area of the 1993 Latur, India, earthquake and its implications for rupture nucleations   总被引：1，自引：0，他引：1  

S. Mukhopadhyay  O.P. Mishra  D. Zhao  J.R. Kayal 《Tectonophysics》2006,415(1-4):1-16

The Latur earthquake (M_w 6.1) of 29 September 1993 is a rare stable continental region (SCR) earthquake that occurred on a previously unknown blind fault. In this study, we determined detailed three-dimensional (3-D) P- and S-wave velocity (V_p, V_s) and Poisson's ratio (σ) structures by inverting the first P- and S-wave high-quality arrival time data from 142 aftershocks that were recorded by a network of temporary seismic stations. The source zone of the Latur earthquake shows strong lateral heterogeneities in V_p, V_s and σ structures, extending in a volume of about 90 × 90 × 15 km³. The mainshock occurred within, but near the boundary, of a low-V_p, high-V_s and low-σ zone. This suggests that the structural asperities at the mainshock hypocenter are associated with a partially fluid-saturated fractured rock in a previously unknown source zone with intersecting fault surfaces. This might have triggered the 1993 Latur mainshock and its aftershock sequence. Our results are in good agreement with other geophysical studies that suggest high conductivity and high concentration of radiogenic helium gas beneath the source zone of the Latur earthquake. Our study provides an additional evidence for the presence of fluid related anomaly at the hidden source zone of the Latur earthquake in the SCR and helps us understand the genesis of damaging earthquakes in the SCR of the world.  相似文献