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1.
博兴洼陷油气勘探已进入隐蔽油气藏为主的勘探阶段,储集砂体的分布,尤其是能够形成地层岩性油藏的有利储集砂体的分布,是油气勘探的关键.研究区主要发育有浊积扇、辫状三角洲前缘和近岸水下扇三种类型的储集砂体,其中浊积扇扇体是岩性圈闭勘探的最有利砂体.通过已发现油气藏的地层位置分析,发现MSC8、MSC7、MSC6、MSC5、MSC2旋回的上升半旋回是有利储集砂体发育的主要层段,浊积扇砂体发育,且具有有利的油气成藏条件.平面上,MSC8旋回的有利储集砂体主要发育在高青断层东南侧的狭长区域内,MSC5、MSC6、MSC7旋回的有利储集砂体发育在坡折带之下的洼陷区.综合上述分析,预测了坡折带下部洼陷区、高青断裂下降盘和高24-高27井间区域3个岩性和构造-岩性圈闭勘探有利区. 相似文献
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鄂尔多斯盆地上三叠统延长组深湖沉积与油气聚集意义 总被引：8，自引：0，他引：8
鄂尔多斯延长组湖盆为一大型的敞流湖盆.其充填演化与构造发育史、古气候演化史具有明显的一致性,可以划分为4个演化阶段,即湖盆形成及扩张期、鼎盛期、回返期、萎缩消亡期.在此过程中,湖盆经过四次明显湖进与湖退变化,但深湖中心变化不大,一直沿华池—宜君一带波动.在整个晚三叠世盆地盛衰演化过程中,深湖沉积体系主要为深水型三角洲及浊积扇体系,前者在深湖扩展早期的三角洲快速推进时期的陡岸斜坡区比较发育,并随着三角洲的推进逐渐从深水型向浅水台地型转变.后者在各个时期都有出现,按其沉积特征可分为两种浊积扇:坡移浊积扇相带发育相对齐全,垂向上多期互相叠加,可划分为:斜坡-槽道-内扇亚相、浊积水道、浊积水道间、浊积水道前缘-中扇亚相、外扇亚相和盆地平原亚相.滑塌浊积扇多呈透镜状夹于深湖亚相的深灰色泥岩中,相带分异不明显,仅可分为中心相和边缘相.两类浊积扇主要分布在盆地的近源斜坡带及远源末梢斜坡带.深湖沉积控制了烃原岩及有利生储盖组合分配.坡移浊积扇沉积厚度大,分布广,储集物性好,是深湖区岩性油藏勘探的主要目标. 相似文献
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断陷湖盆源汇体系要素特征研究,有效预测沉积体及其主控因素分析,对油气储集规模和勘探具有重要意义．以珠江口盆地海丰33洼陷为例,基于钻测井资料、高分辨三维地震资料,结合沉积数值模拟技术,对研究区上文昌段源汇体系进行研究．结果表明：（1）研究区主要发育断裂坡折带和侵蚀坡折带两种类型坡折带,发育高隆区、低隆区和洼陷-盆地区三种古地貌单元．（2）北部隆起带、海丰凸起和陆丰中低凸起为上文昌时期的主要物源区,物源多为近源供应,沿沟谷向洼陷内部沉积．（3）上文昌组沉积时期,洼陷北部陡坡带边界断层控制发育近源扇三角洲沉积,具有厚度大、推进距离近的特点;南部缓坡带形成大规模辫状河三角洲沉积,向洼陷内部延伸距离较远,结合沉积数值模拟结果分析,湖盆深洼处发育深湖-半深湖沉积,有利于发育稳定泥质沉积物,为下一步勘探研究具有指导作用． 相似文献
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鄂尔多斯盆地西南部地区天然气勘探程度较低,2004年ZT1井在山西组山1段试气荻工业气流,揭示上古生界具备良好的勘探前景.上古生界天然气成藏特征研究表明,二叠系发育西南物源石英砂岩储集体,主要含气层系是山西组山1段、石盒子组盒8段,砂体厚度相对较薄,埋深超过4000m.区内储层普遍致密,局部发育相对高渗层段,与煤系烃源岩配置良好,是形成致密砂岩气藏的有利区带.本文应用地震勘探攻关成果,建立主力砂体地震响应模式,进一步落实了山1、盒8砂体的展布,结合探井钻探效果,优选了有利钻探目标.在试气方法上引入体积压裂理念,QT1井试气获工业气流,勘探取得新突破.对研究区天然气成藏条件的分析、主力砂体地震预测模式及试气工艺等成功经验的总结,对该区天然气勘探的深入开展具有重要的指导意义. 相似文献
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东濮断陷湖盆兰聊陡坡带扇体形成机制及成藏规律研究 总被引：16，自引：1，他引：15
陆相断陷湖盆陡坡带由于具有特殊的构造背景,在下降盘易发育各种类型的砂砾岩扇体,且具有很好的含油气前景,近几年各大油田也都将其作为增储上产的重要勘探领域．但由于这些扇体一般都具有较大的隐蔽性,而且控制影响因素复杂,尤其是对于为数较多的受高角度大断层控制的断陷湖盆,在陡坡带进行砂砾岩扇体的勘探具有更大的风险性．本文运用层序地层学、地震精细描述等勘探新理论、新技术和新方法,结合生产实际,对东濮凹陷高角度兰聊陡坡带砂砾岩扇体形成机制及成藏规律进行了多学科综合研究,查明了扇体的成因机制、控制因素、分布规律,并进一步探讨了扇体成藏机理和成藏规律,为下一步勘探指明了有利方向和钻探目标,期望为国内外同类盆地陡坡带油气资源的勘探也提供了一定的借鉴． 相似文献
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浊积岩分序级描述技术是在前人研究与勘探实践基础上,以层序地层学理论为指导,结合较为前沿的地震沉积学理论,分析层序内部结构,明确了浊积岩发育序级的划分原则、对比和划分方法;以地震资料为基础,充分发挥了井震结合的优势,形成了浊积岩的地震识别模式的建立方法.本次研究建立了东营凹陷沙三段和沙四上不同类型浊积岩的地震响应模式,形成了浊积岩分序级描述技术;该技术可以用来预测新的浊积岩发育区.东营凹陷油气勘探实践证明,在浊积岩分序级描述的基础上进行勘探优化部署,可以有效的提高浊积岩油藏的勘探成功率. 相似文献
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渤海湾盆地东营、沾化凹陷早第三纪同沉积断裂作用对沉积充填的控制 总被引：55，自引：1，他引：55
渤海湾盆地东营和沾化凹陷是胜利油田的主要勘探和开发区. 早第三纪沉积充填的综合研究表明, 同沉积断裂及其组合样式对盆内沉积体系域的发育分布起到重要的控制作用. 盆地的充填序列和演化反映了幕式断陷作用的总体控制. 长期活动的同沉积断裂形成古地貌上突变的断裂坡折带或断坡带, 构成古构造单元和沉积相域的分界并控制着沉积相带的总体展布. 凹陷中部的洼陷边缘断裂坡折带常常控制着粗碎屑沉积体系的沉积中心, 特别是低位域三角洲或湖底扇的发育和分布, 是盆内寻找砂岩油气藏的最有利区带. 同沉积断裂具有多种组合样式, 包括平行或雁行状断裂系、梳状断裂系、帚状断裂系以及断裂调节带等, 形成特定的构造古地貌, 制约着沉积物的分散过程和砂体堆积. 揭示同沉积断裂(坡折)带的活动和分布, 再造各沉积期的构造古地貌, 是进行沉积体系和砂体分布预测的关键. 相似文献
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白云凹陷位于南海北部陆缘深水地带,是我国深水油气资源勘探的重要地区。开展重-震成像研究,是分析该区烃源岩分布特征、大型构造圈闭、成藏层系与储层条件的重要方法。本文通过重力异常、地震Vs波速结构模型及地震勘探剖面分析,获得研究区自由空间重力异常、布格重力异常、水平和垂向梯度、密度反演图像、Vs波速度结构图像以及高分辨率地震勘探剖面图像。重力图像揭示:白云凹陷中心的强负值异常图像与较厚沉积和基底起伏有关;凹陷东侧相对高正值局部重力圈闭与中生代残余地层有关;凹陷北侧条带状正异常则与陆坡向洋盆过渡时基底下凹有关。白云凹陷的主凹陷和南凹陷存在明显的层状负剩余密度或相对低密度区,是有利的含油气层位。地震图像揭示:白云凹陷由北向南存在明显的细颈化带、外缘隆起带、洋陆过渡带等结构。在陆缘地壳强烈伸展薄化期间,白云凹陷形成大型三角洲-湖相烃源岩沉积环境的凹陷结构,沉积物源主体来自北侧。随着地壳强烈减薄的细颈化,凹陷出现明显的台阶式沉陷,导致陆架坡折带由南向北迁移,形成陆架边缘三角洲、深水重力流水道和深水扇等有利的储层。高分辨率地震资料获取的地震勘探剖面图像上,可以识别出许多浅层气运移通道,表明白云凹陷丰富的中、浅层气大多来源于深部地层。 相似文献
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本文从长岭凹陷隐蔽油气藏勘探实际出发,以分析该区的油气地质条件、控砂主导因素及油气成藏规律为主线,利用钻井、地震等资料通过地震属性分析、测井约束反演等方法对该区进行了储层预测,寻找有利的储层分布范围,研究砂体在空间展布特征,掌握砂体与断层的配置关系、砂体的尖灭情况,进而识别不同类型隐蔽型圈闭.指出该区隐蔽油气藏主要有三种成藏类型,即构造-岩性复合型、砂岩上倾尖灭型、砂岩透镜体型.远物源缓坡河流-三角洲沉积体系控制该区砂体分布,使得油气富集成藏规律主要表现为多层位含油,各个砂组交互发育;单个油藏面积小,在平面上具有多套砂体形成迭合连片的特征.主要目的层,如青一、二段砂体,以三角洲前缘分支河道发育为主,河道走向北东向.研究区内的断层走向近南东—北西向,与砂体走向垂直.这种断层与砂体配置关系,易形成构造-岩性复合圈闭. 相似文献
11.
Offshore gasmining is an example of a human intervention with a morphological impact. On land, it is usually attended with a dish-like bed depression. We show that, if located at sea, such a bed depression can become morphodynamically active by triggering mechanisms related to tidal sand bank formation. To that end, a simple morphological model is considered which describes an erodible bed subject to a tidal wave in a shallow sea. The continuous subsidence is modelled by a sink term in the sediment balance. Then, a linear approximation is carried out to describe the bed evolution after the onset of subsidence. The results, presented in physical space, show that the subsidence triggers the formation of a sand bank pattern that gradually spreads around the centre of subsidence, at a rate that may go up to 160 m year−1, depending on the tidal transport rate and the tidal eccentricity. The dimension of the depression does not affect the spreading rate nor the orientation of the sand banks, but it does influence their spacing. The main conclusion is that the horizontal extent of the area influenced by the bed depression by far exceeds that of the direct subsidence, thus showing that bed depressions on land and at sea indeed behave in fundamentally different ways. The results suggest that nonlinear effects are worthwhile to be investigated in order to describe finite amplitude development of sand banks as well as the interaction between subsidence and bed forms. 相似文献
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叙述井分析了山西地震带地质构造特点和近期的中强地震及震群活动基本特征，在此基础上，与大同一阳高地震进行了分析对比，认为大同－阳高地震是山西地震带近期地震活动的继续，而山西地震带今后强震活动阶段的开始，其标志应是ＮＶＥ向新生代断陷内的中强地震活动，因此在分析和预估山西地震带今后地震发展趋势时，应密切注视这一地带的地震活动。 相似文献
13.
Michel Chouteau Stefka Krivochieva Ramiro Rodriguez Castillo Tomas Gonzalez Moran Virginie Jouanne 《Journal of Applied Geophysics》1994,31(1-4)
A tensor magnetotelluric test survey was carried out in the region of Santa Catarina, located in the Chalco sub-basin of the Mexico Basin. The objective was to define the stratification at depth with an emphasis on the geometry of the main aquifer of that region which is partially known from DC resistivity soundings and drilling. High-quality magnetotelluric soundings could be recorded in the immediate vicinity of large urban zones because the sub-surface is very conductive. Interpretation shows that the solid bedrock is located at a depth of at least 800 m to the south and 1300 m to the north; it could, however, be much deeper. Using complementary DC resistivity sounding and well-logging data, three main layers have been defined overlying the bedrock. These layers are, from surface to bottom, an unsaturated zone of sand, volcanic ash and clay about 10 m thick, followed by a very conductive (1.5 ohm·m) 200 m thick layer of sand and ash with intercalated clay, saturated with highly mineralized water, and finally a zone with resistivity increasing gradually to 60 ohm·m. The investigated deep aquifer constitutes most of this third layer. It consists of a sequence of sand, gravel, pyroclastites and mainly fractured basalts. MT resistivity soundings and magnetic transfer functions also indicate that a shallow resistive structure is dipping, from the northwest, into the lacustrine deposits of the basin. This geologic feature is likely to be highly permeable fractured basaltic flows, which provide a channel by which water contaminated by the Santa Catarina landfill may leak into the basin. 相似文献
14.
Distribution and species composition of macroinvertebrates in the hyporheic zone of bed sediment 总被引：1，自引：1，他引：0
The hyporheic zone is a layer of substrate on a river bed where benthic animals normally live,grow,feed,reproduce,and exist for any portion of their life cycle.The hyporheic zone was studied by samplin... 相似文献
15.
分段研究了山西地震带的地震破裂特征,表明:各个断陷盆地地震破裂随时间的非平稳过程特征与盆地的构造运动性质有关;在一个断陷盆地内,在地震破裂系统中强震的破裂起主导作用.这些认识,对研究确定各个断陷盆地内今后的地震危险地段是有意义的. 相似文献
16.
珠江三角洲新构造运动与地壳稳定性分析 总被引：4，自引：1，他引：4
对珠江三角洲的活动断裂，断块构造，第四纪地质及地震活动特征进行了分析，认为该区的地壳稳定性主要中等，其中东江断块，番禺断隆，五桂山断隆，珠海断隆和新会断陷的地壳稳定性较好，灯笼沙断陷和万顷断裂是地壳稳定性较差的地区。 相似文献
17.
An experimental investigation on the initiation and development of bed forms on a bed of fine silica sand was conducted under alluvial flow conditions in a laboratory flume with a diverging channel. The main aims of the study were to assess： i） the steepness of bed forms in the transition stage of development; and ii） the threshold height of wavelets （ηt） that triggered the start of ripple development. Detailed bed profile measurements were carried out using an acoustic Doppler probe, traversed longitudinally over the sediment bed at various experimentation times. The bed form dimensions were extracted from such bed profile records and analysed for the wavelet, transition and equilibrium stages. It was found that the steepness of ripples in the transition and equilibrium stages were similar, confirming predictions of previous mathematical model simulations. A lognormal distribution fitted the wavelet length data. The wavelet threshold height was estimated as ηt ≈ 7 mm, or ηt≈ 80 in wall units. Such a height magnitude suggested that ripple development could be triggered by the wavelets reaching the outer flow zone of a turbulent boundary layer. The ηt value obtained corresponded generally to the intersection point between two predictive equations for bed form dimensions. A formulation was developed to predict ηt as a function of the sediment grain size, which was confirmed for the fine sand used in this study. 相似文献
18.
ZhenQi Wang DongMing Zhi ChangMin Zhang XinKe Xue ShangFeng Zhang TianMing Li Fei Yang LouJun Liu Liang Cheng Dong Lu FengJuan Zhou YuanYong Chen 《中国科学D辑(英文版)》2009,52(1):106-114
Well che89, located in the Chepaizi area in the northwest margin of Junggar basin, acquires high production industrial oil flow, which is an important breakthrough in the exploration of the south foreland slope area of Junggar basin. The Chepaizi area is near two hydrocarbon generation depressions of Sikeshu and Shawan, which have sets of hydrocarbon source rock of Carboniferous to Jurassic as well as Upper Tertiary. Geological and geochemical parameters are proper for the accumulation of mixed source crude oil. Carbon isotope, group composition and biomarkers of crude oil in Upper Tertiary of well Che89 show that the features of crude oil in Upper Tertiary Shawan Formation are between that of Permian and Jurassic, some of them are similar to these two, and some are of difference, they should be the mixed source of Permian and Jurassic. Geochemical analysis and geological study show that sand extract of Lower Tertiary Wulunguhe Formation has the same source as the crude oil and sand extract of Upper Tertiary Shawan Formation, but they are not charged in the same period. Oil/gas of Wulunguhe Formation is charged before Upper Tertiary sedimentation, and suffered serious biodegradation and oxidation and rinsing, which provide a proof in another aspect that the crude oil of Upper Tertiary Shawan Formation of well Che89 is not from hydrocarbon source rock of Lower Tertiary. 相似文献
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在整理和分析了703口钻井测温资料的基础上，编制了济阳坳陷现今地温梯度分布图、4～6km深度的地温分布图和下第三系沙四段顶界面地温分布图. 研究表明：济阳坳陷的现今地温梯度平均为35.5℃/km，其中沾化、东营、车镇和惠民等4个主要凹陷地温梯度平均值分别为36.1℃/km、35.5℃/km、35.4℃/km和34.6℃/km，外围的潍北凹陷为35.0℃/km. 地温和地温梯度分布主要受凸凹相间的构造格局控制，与基底埋深有关，表现为凸起区高、凹陷区低的特征. 另外，济阳坳陷一些地温梯度相对较高的地区与新生代的火山岩分布基本吻合. 盆地基底埋深，即盆内凸起凹陷的分布，受盆地形成过程中岩石圈伸展控制，火山岩的分布也与岩石圈伸展作用有关，所以，济阳坳陷的地温场分布特征是由构造演化决定的. 研究结果还表明，济阳坳陷大部分地区沙四段目前还处在油气液态窗内. 相似文献