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1.
塔西南拗陷甫沙构造带结构模型及形成机制   总被引:1,自引:0,他引:1  
塔西南拗陷甫沙构造带是西昆仑山前第一排冲断褶皱带。由于浅层覆盖第四系巨厚黄土及深层强烈冲断褶皱变形导致地震资料品质较低,构造解释具有多解性。通过综合分析区域构造背景、地面地质、钻井和地震资料,认为浅层是以上白垩统—古近系膏盐岩为滑脱层的盖层滑脱褶皱变形;深层是基底卷入的中—高角度区域性正反转断层,及在正反转断层下盘由叠瓦状分支逆冲断层组成的楔状叠瓦构造,深、浅构造层整体"分层收缩、垂向叠置"模型能合理解释现有的可靠构造信息。正反转断层在横向上分隔甫沙构造带与西昆仑褶皱造山带,膏盐岩塑性滑脱层在纵向上分隔浅层新生代与深层中生代构造变形。西昆仑山在新近纪—第四纪隆升,引发了自西昆仑山深层向塔西南拗陷斜向向上挤压,促使侏罗—白垩纪区域性先存正断层反转,并控制甫沙构造带的形成演化。  相似文献   

2.
大洼─昌图凹陷是铁岭─昌图盆地内的一个次级负向构造单元,是在海西褶皱带基底上发育起来的一个晚侏罗世至早白垩世的早断晚拗型凹陷.依其构造及沉积特征,并结合我国东部中生代的构造特点将其演化划分为四个阶段:即凹陷的孕育期、断陷期、拗陷期及萎缩消亡期.并运用板块理论对其演化的动力学机制进行探讨.最后通过构造对生储盖的控制作用,指出有利的勘探部位.  相似文献   

3.
位于扬子克拉通西部的四川盆地在前震旦纪基底形成之后经历了多旋回构造演化,长期以来对其在不同地质历史时期的构造动力学性质、盆地类型存在争议;而理清不同时期盆地类型及其叠合特征对于上扬子克拉通盖层演化及油气勘探具有重要意义。作者利用穿过盆地的北西-南东向区域地震反射大剖面,结合钻井、野外地质、区域地质资料,对四川盆地的构造-沉积演化进行剖析,识别出5个区域不整合面,划分出5个盖层构造层,认为在纵向上形成了海相克拉通裂陷盆地(Z-S)、海相克拉通拗陷盆地(P_1l-T_2l)、海陆交互相断陷盆地(T_3x~1-T_3x~3)、陆相拗陷盆地(T_3x~4-J)、前陆盆地(K-Q)等原型盆地的有序叠合。  相似文献   

4.
周口拗陷油气地质特征   总被引:1,自引:0,他引:1  
目的 周口拗陷是由多个次级凹陷、多套烃源岩层、多套目的层系组成的一个复式拗陷,认识其地质特征对油气勘探意义重大。方法 运用地震资料解释、地震地质综合研究、层序地层、圈闭评价等方法,对生、储、盖、圈、运、保等基本石油地质条件进行了分析。结果 认为该区油气资源丰富,有4个主要圈闭形成期和油气运移期,形成3种油气聚集类型;综合评价指出谭庄-沈丘凹陷、倪丘集凹陷为Ⅰ类勘探有利区,舞阳、襄城、鹿邑凹陷为Ⅱ类勘探有利区。结论 周口凹陷的油气勘探,应围绕该有利地区进行深入研究。  相似文献   

5.
唐河低凸起是南襄盆地内分隔泌阳凹陷与南阳凹陷的次级正向构造单元,其地质结构研究对该区油气勘探和分析泌阳、南阳两富油凹陷的构造—沉积充填关系均具有重要意义。以地震、钻测井及地化资料为基础,分析唐河低凸起的地层充填、构造特征、形成演化和成因机制,并探讨其油气勘探潜力。研究表明,唐河低凸起自下而上发育玉皇顶组、大仓房组、核桃园组、凤凰镇组及平原组。构造东西分块,为受桐河街断层分隔的南阳、泌阳两凹陷斜坡带组成的“类地垒”形态;南北分带,呈多个半地堑形态。构造演化分析将该区演化阶段划分为统一沉降期、差异沉降期、挤压定型期和拗陷期4个阶段,低凸起的成因机制与区域构造应力场转换下边界断层的差异活动密切相关。唐河低凸起具有多凹陷烃源岩供烃、多层系有效储层发育、长期高效输导体系及多类型圈闭垂向叠加的有利条件,具有一定的油气勘探潜力。  相似文献   

6.
系统分析了贝尔凹陷断裂构造特征,研究了断裂的形成演化对油气成藏条件的控制作用。贝尔凹陷自下而上划分为断陷构造层、断-坳转化构造层和凹陷构造层。根据断裂与构造层关系及断裂运动学特征,将贝尔凹陷发育的断层划分为上部断层系、下部断层系和长期发育的断层系断裂3种类型。各个历史演化时期控制着不同成因的断裂发育,贝尔凹陷早期铜钵庙组~大磨拐河组时期的伸展变形控制断陷盆地的发生、发展、消亡的演化过程,伊敏组时期的走滑变形主要形成一系列断裂密集带,同时形成大量次级盖层断层,青元岗组时期的反转构造变形形成了断层型构造反转和局部的背斜型构造反转。断裂的形成和演化影响主力烃源岩的分布和热演化程度,形成多种类型的圈闭,为油气运移提供良好的运移通道。发育长期活动断层的斜坡带和由长期继承性活动断裂与上部断层系构成的密集带是油气运聚成藏的有利指向区,控制着贝尔凹陷油气富集。  相似文献   

7.
目的 探讨鄂尔多斯盆地西缘的东西向构造带的属性,为找矿提供理论依据.方法 从横向构造带的概念和特征入手,通过西缘中部在地质、地球物理和遥感等资料与相邻地区的差异分析为主要方法.结果 鄂尔多斯盆地西缘中部确实存在一个东西向的横向构造带,且具有形成时间早,多期活动的特点.晚侏罗世是主要的活动时期,造成了西缘南北部构造的明显差异.其形成演化是不同时期不同性质的动力学环境相互作用的结果.结论 鄂尔多斯盆地中部的横向构造带具有显著的分区特征,为油气、煤和铀矿共存成藏(矿)的有利地区.  相似文献   

8.
黄骅拗陷新生代构造样式及其演化   总被引:1,自引:0,他引:1  
为了揭示黄骅拗陷新生代盆地原型、恢复盆地构造演化历史,运用油区构造解析理论,对黄骅拗陷新生代盆地构造样式及其演化进行综合分析,认为盆区存在伸展式和走滑式两种基本构造样式。在盆地尺度内,按断层几何学和运动学特点,伸展构造样式可进一步分为伸展拗陷、伸展拗断、地堑断陷、多米诺半地堑断陷、滚动半地堑断陷、复式半地堑断陷、跷跷板断陷、伸展断拗8种次级构造样式,并基本遵循伸展拗陷—伸展拗断—伸展断陷—伸展断拗演化序列,这种演化序列与岩石圈的流变学特征和递进伸展变形过程有关。走滑构造样式受深断裂走滑作用控制,可分为雁列式走滑构造和帚状断层组。  相似文献   

9.
西藏高原东部江达构造带陆内裂谷演化与成矿作用   总被引:1,自引:0,他引:1  
运用地体-板块构造理论分析了江达构造带陆内裂谷期的演化过程.研究表明,作为昌都-思茅构造带的一个主要组成部分,江达构造带陆内裂谷发生于陆缘岩浆弧基础之上,发育典型的裂谷地貌、沉积建造和双峰式岩浆活动,其演化经历了火山地堑阶段(T3-J1)、陆内拗陷阶段(J2-K2)和走滑堑-垒构造系阶段(E1-E2).成矿作用主要发生在火山地堑阶段和陆内拗陷阶段,火山地堑阶段以喷流沉积型矿床为主,陆内拗陷阶段形成夕卡岩型多金属矿床.  相似文献   

10.
《河南科学》2016,(12):2030-2037
在地震解释及地质研究分析的基础上,结合前人对变换带的研究,讨论了高邮凹陷环深凹带戴南组变换带类型、特征,并总结其在沉积体系及油气成藏中的控制作用.研究表明,研究区变换构造主要形成在侧列伸展断层叠覆、分段连接部位或次级凹陷之间,主要发育同向接力式和横向消减式构造变换带,变换构造包括走向斜坡、横向断鼻凸起和调节断层.构造变换带控制着富烃洼陷的形成,并引导古水系流入湖盆,在对应的断层下降盘形成三角洲前缘、扇三角洲前缘及浊积扇砂体,有利于发育富砂储集层;研究区变换带发育复杂的调节断层和多种样式的圈闭,有利于油气的运移与成藏,并对变换带控制的隐蔽油气藏进行预测.  相似文献   

11.
Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.  相似文献   

12.
何延凌 《科技信息》2008,(4):258-258
Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women's language from these perspectives: pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women's language, more attention should be paid to language use in social context. What's more, the linguistic phenomena in a speaking community can be understood more thoroughly.  相似文献   

13.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

14.
王慧 《科技信息》2008,(10):240-240
Wuthering Heights, Emily Bronte's only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.  相似文献   

15.
The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.  相似文献   

16.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

17.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

18.
理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。  相似文献   

19.
As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.  相似文献   

20.
1 Rise of studies on climate change's effects on biodiversity
Until the 1980s, climate change and biodiversity were studied as two independent disciplines for more than a century. In 1992, the Ecological Society of America's annual report named climate change, biodiversity, and the sustainable ecological system as the three major global environmental issues of the twenty-first century [1].  相似文献   

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