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1.
渤海海域B井区勘探程度较低,在东营组沉积期受双向物源影响,其主控物源方向难以确定。将地震正演技术应用于主控物源研究:在岩石物理分析基础上,结合前积体沉积模式和区域地质特征,首先建立2种不同物源方向的前积体正演模型,将其响应特征与实际地震反射特征进行对比,探讨B井区的主控物源和砂体展布规律;然后运用波阻抗递变赋值,赋予前积砂体两端不同的波阻抗差,模拟3种不同岩性差异的前积体地震反射特征,证明B井西侧前积体为富泥前积;最后结合区域地震剖面反射能量特征、砂体厚度特征、砂体属性特征,对比正演模拟结果,认为B井区东二下段主要受来自西北方向的物源控制,该区西北部近物源区应为优质储层富集的有利区带。文中提供了一种新的预测主控物源的方法,对少井区的主控物源研究具有一定的借鉴意义。 相似文献
2.
松辽盆地扶新隆起带南部扶余油层沉积特征及沉积模式探讨 总被引：2，自引：0，他引：2
利用18口井的岩芯分析资料、1 595个重矿物分析数据和近800口井的录井、测井等资料,系统分析了扶新隆起带南部扶余油层的沉积特征和沉积模式。研究揭示扶新隆起带南部扶余油层沉积时期受西南保康物源体系和东南部长春-怀德物源体系双重控制,形成了枝状的高能河控三角洲沉积体系。该三角洲体系骨架砂体为大量、密集、窄带状、连续分布的分流河道砂体,总体呈南南西向展布,砂体连续且向水下延伸较远,直至消失变成薄的席状砂,在三角洲分流平原和三角洲前缘亚相区,形成以（水下）分流河道沉积为中心的多支“河控带状体”;前三角洲亚相与三角洲前缘亚相无明显界限,受湖浪作用控制在三角洲前缘亚相的外前缘区形成浪控席状砂,多个席状砂呈顺岸、垂源平行排列,单一席状砂具有明显条带、环状平面分布模式。 相似文献
3.
黄骅坳陷歧口凹陷古近系沙河街组是大港油田油气勘探的主要目的层,该组主要发育辫状河三角洲和扇三角洲沉积砂体,其中辫状河三角洲砂体是有利的油气储集体。在区域构造、古地貌和沉积体系等研究基础上,应用沉积模拟技术,再现了研究区孔店物源辫状河三角洲的形成过程和沉积微相特征,在实验条件下,孔店物源辫状河三角洲可划分为3个亚相、7个微相。实验研究表明,基底沉降、相对湖平面升降、流量及流量变幅、加砂量（物源供给）等是影响辫状河三角洲的形成及其演化的控制因素。通过实际砂体和实验砂体厚度展布对比分析,预测了有利储集层分布区域。综合歧口凹陷原始地质模型和实验模拟成果,建立了模拟实验条件下歧口凹陷古近系沙三2亚段辫状河三角洲沉积模式。 相似文献
4.
北塘凹陷古近系沙河街组三段物源体系分析 总被引：6，自引：0，他引：6
物源分析是盆地分析的重要内容之一.北塘凹陷古近系沙河街组三段(Es3) 湖泊范围广、沉积厚度大, 而勘探程度低, 是大港油田未来勘探的重要突破区, 精细刻画北塘凹陷沙三段物源体系对沉积体系重建、有利区带预测具有重要意义.采用构造格架及古地貌宏观区分物源区与沉积区, 根据碎屑矿物组合特征划分物源区块, 依据地震反射特征勾绘物源在盆内进积方向, 利用砂体等厚图和砂地比等值线图精细描绘物源分支, 从不同角度、不同层次对北塘凹陷沙三段古物源体系进行精细研究.结果表明, 北塘凹陷物源来自北部燕山褶皱带和西部沧县隆起, 具体分为西部的沧县物源、西北角的汉沽物源、北部的大神堂物源和东北角的涧南物源.在物源体系和构造组合特征的控制下, 沙三段主要发育扇三角洲沉积体系. 相似文献
5.
古地貌是控制古水系、沉积体系的关键因素之一.以渤海湾盆地渤中坳陷东部的辽东东地区中新世馆陶组为例,对馆陶组的沉积区和剥蚀区分别开展了基于残余地层厚度法和印模法的古地貌恢复,以增进对研究区古水系、源－汇系统的整体认识,为其物源体系、沉积环境、砂体分布的预测提供科学依据.两种方法的古地貌及古水系恢复结果对比研究表明,基于残余地层厚度法的沉积区古地貌恢复结果适用于目的层沉积区古水系的恢复;而基于印模法的沉积区－剥蚀区一体化的古地貌恢复结果实现了剥蚀区、沉积区古水系的统一解释.沉积区－剥蚀区一体化的古地貌恢复弥补了基于沉积区古地貌的古水系恢复中难以判断"源－汇体系"中源区古水系分布及从源到汇古水系派生关系的局限性. 相似文献
6.
物源问题一度成为制约歧口凹陷歧南低斜坡沙三段油气勘探的焦点。在综合分析沉积期古地貌及沟谷展布特征、地震属性特征、碎屑颗粒组分、重矿物组合特征、砂体展布特征等资料基础上,探讨歧南低斜坡沙三段沉积时期物源体系特征及分布。结果表明:歧南低斜坡沙三段存在3大物源体系,其中,西部歧南水道物源体系延伸距离远,波及范围大,控制了歧南低斜坡沙三段沉积时期砂体的形成与分布。进一步研究表明,古物源与沉积体系具良好的空间配置关系。受歧南水道主物源体系控制,低斜坡发育辫状河三角洲前缘沉积,砂体分布具"埕宁隆起物源供砂,歧南水道沟槽输砂,物源体系-坡折带联合控砂"的内在机制。物源方向的确定对研究沉积体系展布、砂体分布及有利勘探区预测具重要意义。 相似文献
7.
准噶尔盆地车排子凸起新近系沙湾组为湖盆缓坡多物源、复杂沉积体系沉积,其沉积体系认识争议很大,时空演化难以刻画.准确刻画其沉积体系类型、演化规律和砂体分布特征,是精细刻画单砂体及内部构型等储层的基石,对后期油气开发具有重要指导意义.在岩心、测井、测试分析及地震资料,充分利用相位转换、地层切片等地震沉积学技术方法,对其沉积体系特征进行深入研究.建立研究区精细层序地层格架,将沙湾组划分为2个三级层序、4个四级层序;识别出冲积扇、辫状河、曲流河、曲流河三角洲、扇三角洲及滨浅湖6种沉积体系类型,并确定沉积体系边界及演化规律;建立了多物源冲积扇-辫状河、扇三角洲-曲流河三角洲沉积模式及砂体分布模式.辫状河道、心滩、点坝复合体及冲积扇砂体均钻遇较好油气显示,为重要储集体.此次研究丰富了地震沉积学在湖盆缓坡多物源、多沉积体系类型中的应用. 相似文献
8.
饶阳凹陷新近系馆陶组物源方向分析 总被引：2，自引：0，他引：2
张立强 《吉林大学学报(地球科学版)》2012,42(2):321-326,334
为了深入认识沉积物源的位置及古流向,通过矿物成分、岩屑特征、重矿物组合及分布、砂体展布特征等分析,对饶阳凹陷馆陶组的物源方向进行了系统研究。结果表明,饶阳凹陷新近系馆陶组沉积时期,盆地存在4个相对独立的物源及古水流体系:分别为来源于北或北东部物源自北向南或北东—南西流向的水系,来源于西部物源、西南—北东向展布的水系,源于西部物源、东西向展布的水系,源于南部或西南部物源、西南—北东向展布的水系。新近系的河流流向以南北向、沿盆地长轴方向为主,盆地内砂体具有南北向带状展布的特征;中部留路地区距离物源区相对较远、盖层较发育、储盖组合条件好,为饶阳凹陷新近系油气聚集的有利区带。 相似文献
9.
物源问题的研究对于了解和确定研究区有利沉积相带及储集砂体的分布、寻找有利油气储集层具有重要意义。胜坨地区沙四上勘探程度相对较低,前人关于目的层段的物源体系的研究成果很少。为了进一步查清研究区沙四上沉积时期砂体成因和物源方向,更好地预测砂体的分布,本文综合运用地震、测井、地球化学等资料,采用古地貌分析法、沉积砂体岩屑类型对比法、砂岩百分含量法和沉积物特征元素等方法探讨了胜坨地区沙四上亚段砂体的物源方向,并结合特征元素物源指数判别公式对沙四上亚段物源体系实现了定量评价。综合分析认为研究区沙四上亚段具有多物源体系特征,除了直接来自于胜北断层和坨94断层上升盘的物源外,还有沿着胜北断层与坨94断层转换带处的物源体系。 相似文献
10.
大邑地区须二段沉积时期物源体系较四川盆地其他地区简单,且川西南地区须家河组沉积厚度也较盆地其他地区薄。针对现有研究成果有关物源方向存在众多争议的现状,本文从区域沉积背景分析、须家河组野外露头岩性组合特征识别、钻井岩心精细描述、测井相分析、地震反射特征、岩石矿物成分变化等方面入手,认为:①大邑地区及周边区块物源主要来自于盆地西南方,物源区可能为康滇古陆及其周边的古隆起;②研究区须二段处于辫状三角洲前缘环境,有利的储集砂体类型为水下分流河道及河口坝;③受沉积物供应、构造升降运动、以及分流河道频繁迁移的影响,在构造西南翼主要发育水下分流河道,构造主体部位为水下分流河道与河口坝砂体叠置区;④纵向上,两种成因类型的砂体反复叠置,形成了须二段上部连续发育且厚度巨大的砂岩。通过对大邑地区须二段物源及沉积体系的研究,进一步深化了对气藏砂体展布的认识,对今后该区块进一步的勘探具有一定的参考作用。 相似文献
11.
东濮凹陷北部沙三中亚段广泛发育盐岩和烃源岩,这两个看似不能共存的物质却在这里互层共生。该时期研究区沉积特征为多盐韵律与多层烃源岩互层共生、连续沉积,单个盐韵律厚度从几米到十几米,烃源岩有机质丰度高、类型好。平面上,两者在湖盆沉积沉降中心共生;垂向上,高有机质丰度、好干酪根类型与高盐度地层具有较好的对应关系。因而成为恢复古气候和古环境的重要研究对象。通过岩石学、古生物学以及Sr/Ba、B/Ga、(V+Ni+Mn)、Fe/Mn、Sr/Cu、Mg/Ca、V/(V+Ni)、稀土元素含量和氯同位素等方法对凹陷北部沙三中亚段的沉积环境进行研究。结果表明,凹陷北部沙三中亚段为深水沉积的还原环境,古盐度较高,达到半咸水-咸水沉积;微量元素和孢粉化石特征表明研究区沙三中亚段为温暖潮湿的环境。 相似文献
12.
The Importance of the Precipitation and the Susceptibility of the Slopes for the Triggering of Landslides Along the Roads 总被引：3，自引：1，他引：2
Clemente Irigaray Francisco Lamas Rachid El Hamdouni Tomás Fernández José Chacón 《Natural Hazards》2000,21(1):65-81
In order to characterise the influence of the heavyrains on the observed landslides during the 1996–1997hydrological cycle, rainfall records for the last 100years are analysed from 104 stations in easternAndalusia. Regarding the amounts of rain recordedbetween October 1996 and March 1997 in the 104stations studied, 31 presented new all-time records;15 presented values that were 80–100% of thepre-1995 record; 49 stations, 80–50%; and 9stations, < 50%. A map has been devised of thesusceptibility of the materials through which thesouth-eastern Andalusian road network crosses,together with an inventory of the damage caused byinstability phenomena on banks and cuttings of theroad network during the winter of 1996–1997. Therelationships between the rainfall during the studyperiod, the damage caused to the road network and thesusceptibility of the materials affected are analysed.The results indicate that there is a clearcorrespondence between the rainfall recorded and thesusceptibility of the materials with the inventorieddamage. It is concluded that the widespread seriousdamage caused in early 1997 to the roads andsurrounding areas in the Alpujarra region and thecoast of the Province of Granada was mainly caused bythe extraordinarily heavy rains. However, considerablyless damage was observed where the susceptibility ofthe terrain is low, thus highlighting the extremeusefulness of terrain-susceptibility maps for riskprevention and territorial planning. 相似文献
13.
郯庐断裂南段研究进展与断裂性质讨论 总被引：13，自引：3，他引：13
据1：5万区域地质调查和专题研究资料，就郯庐断裂带是否南延与消失的原因，其与大别—苏鲁造山带交截形成的假位错效应，以及与中新生代沉积盆地形成演化的关系等作了新的阐述。在此基础上，讨论了郯庐断裂带是否为巨大的左行平移断层或转换断层。认为郯庐断裂带可能是在“古郯庐带”的基础上于早侏罗世重新活动、白垩纪强烈活动的地堑型枢纽断裂带。 相似文献
14.
Guboglo M. N. 《GeoJournal》1980,4(1):53-58
International unity is becoming ever stronger in this country owing to an increasing similarity in the development of the cultural environment. This comprises the provision of all the country's republics with a sufficient number of schools, theatres, and other institutions and cultural information media in accordance with the needs of the population. An important part is played by the rise in ‘the general educational level, as well as the level of professional qualifications and skills. Among all the Soviet nations and nationalities, this rise being more rapid among formerly backward peoples. Prominent among the factors of internationalization is the progressive development of the nationalities’ cultural resources, while professional culture is being increasingly brought within the reach of the masses.The implementation of the nationalities policy promotes the all-round development of all Soviet nations and nationalities, their drawing together, the upsurge of the individual capabilities of every Soviet citizen. 相似文献
15.
某高速公路下伏煤矿采空区稳定性分析 总被引：10，自引：0，他引：10
在论述某高速公路下伏砦脖煤矿采空区地质、采矿和工程地质特征的基础上, 进行了稳定性数值模拟分析, 定性与定量地分析与评价了该煤矿采空区的地表变形特征及稳定性。研究结果表明: 该煤矿采空区的变形尚未完成, 对拟建的高速公路将产生很大的危害, 必须采取相应的工程治理措施。 相似文献
16.
17.
Jiayu Rong Michael Melchin S. Henry Williams Tatyana N. Koren Jacques Verniers 《《幕》》2008,31(3):315-318
The Global Stratotype Section and Point （GSSP） for the base of the Silurian System was defined in 1985. Since that time, a number of researchers have suggested that this section has serious deficiencies for use as a GSSP. As a result, in 2000, the Subcommission on Silurian Stratigraphy （SSS） proposed undertaking a formal restu@ of this GSSP, which was subsequently approved by the International Commission of Stratigraphy （ICS）. The result of this restudy was the formal proposal that the current GSSP, at 1.6 m above the base of the Birkhill Shale, at Dob＇s Linn, Scotland, should be maintained as the same locality and stratigraphic level, but the bios- tratigraphical definition of the boundary should be revised. The previously defined, basal Silurian grapto- lite zone, the Parakidograptus acuminatus Zone, should be subdivided into a lower Akidograptus ascensus Zone and a higher E acuminatus Zone. The base of the A. ascensus Zone, marked by the first appearance of A. ascensus, should be regarded as the biostratigraphic mark for the base of the Silurian. This proposal has now been formally approved by the SSS and ICS, and ratified by International Union of Geological Sciences. This is the first GSSP to undergo formal restudy and redefini- tion, and the proposal also included a recommended procedure for restudy of GSSPs. 相似文献
18.
Dean S. Oliver 《Mathematical Geology》1998,30(7):911-933
In reservoir characterization, the covariance is often used to describe the spatial correlation and variation in rock properties or the uncertainty in rock properties. The inverse of the covariance, on the other hand, is seldom discussed in geostatistics. In this paper, I show that the inverse is required for simulation and estimation of Gaussian random fields, and that it can be identified with the differential operator in regularized inverse theory. Unfortunately, because the covariance matrix for parameters in reservoir models can be extremely large, calculation of the inverse can be a problem. In this paper, I discuss four methods of calculating the inverse of the covariance, two of which are analytical, and two of which are purely numerical. By taking advantage of the assumed stationarity of the covariance, none of the methods require inversion of the full covariance matrix. 相似文献
19.
Deviation of the major axis of the inertia ellipsoid of the Moon from the direction toward the Earth
B. P. Kondratyev 《Astronomy Reports》2017,61(8):709-714
It is known from observations that the center of mass of the Moon does not coincide with the geometric center of its figure, and the line connecting these two centers is not aligned with the direction toward the center of the Earth, instead deviating toward the Southeast. This stationary deviation of the axis of the inertia ellipsoid of the Moon to the South of the direction toward the Earth is analyzed. A system of five linear differential equations describing the physical libration of the Moon in latitude is considered, and these equations are derived using a new vector method taking into account perturbations from the Earth and partly from the Sun. The characteristic equation of this system is obtained, and all five oscillation frequencies are found. Special attention is paid to the fifth (zero) frequency, for which the solution of the latitude libration equations are stationary and represents a previously unknown additional motion of the rotational axis of theMoon in a cone with a small opening angle. In contrast to the astronomical precession of the Earth, the rotation of the angular-velocity vector is in the positive direction (counter-clockwise), with the period T 3 = 27.32 days. On this basis, this phenomenon has been named “quasi-precession.” This quasi-precession leads to a stationary inclination of the major axis of the inertia ellipsoid of theMoon to the South (for an observer on Earth), making it possible to explain one component of the observed deviation of the center of mass of the Moon from the direction toward the Earth. The opening angle of the quasiprecession cone is approximately 0.834″. 相似文献
20.
正Artemia cysts are an extremely important component of aquaculture diets.It is well established that the cultivation of fish and shellfish derive substantial health and growth advantages when Artemia are included in the diets of the 相似文献