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扇三角洲沉积体系广泛发育于中国多个断陷盆地中,作为一类重要的油气储层,其内部的构型表征对高含水期的剩余油分布预测具有重要的指导意义。以王官屯油田官195断块孔店组枣Ⅴ油组为例,结合岩心、测井数据和动态资料进行扇三角洲前缘储层的构型定量表征研究。官195断块扇三角洲前缘储层构型要素包括水下分流河道、河口坝、席状砂和水下分流河道间。建立了扇三角洲前缘构型级次划分方案,确立了水下分流河道、河口坝以及河口坝内部增生体间夹层的识别标志。以单砂层为研究单位,利用滦平盆地西瓜园组扇三角洲野外露头实测原型进行数据拟合,得出研究区水下分流河道和河口坝定量化表征的预测公式,计算河口坝内部夹层倾角,预测内部增生体的发育规模。单一成因砂体控制的剩余油分布于坝缘部位和河道顶部,夹层控制的剩余油分布需根据坝主体的韵律进行具体分析。 相似文献
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二连盆地扇三角洲储层沉积特征 总被引:3,自引:1,他引:3
建立二连盆地三角洲沉积相模型,确定盆地油气勘探重要领域。方法:利用大量钻井剖面,地震资料,岩性分析,测试成果,岩心观察和油气显示资料进行综合分析,研究了二连盆地30个凹陷中扇三角洲的形成背影和沉特征。 相似文献
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桑合油田都一段扇三角洲储层沉积特征 总被引:1,自引:1,他引:1
为搞清桑合油田主力层位都一段(下白垩统都红木组)的沉积特征和储层变化情况,认清油水分布规律,文中利用大量的钻井、测井和地震等资料,根据岩性分析、岩心观察和油气显示资料,对白音查干凹陷桑合油田都一段储层的沉积特征进行了研究,详细阐述了储层的岩性、沉积相类型及砂体展布特征,建立了沉积相模式,并对其含油性进行了分析。研究认为:本区主要以扇三角洲前缘沉积为主,局部存在重力流沉积。而三角洲前缘亚相水下分流河道微相的储集条件和含油性最好,是断陷湖盆油气勘探的重要区带。 相似文献
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高尚堡油田沙三段扇三角洲储层沉积学特征 总被引:5,自引:0,他引:5
高尚堡油田沙三段二、三亚段为一套粗碎屑扇三角洲沉积,沉积物主要来自NE方向,具有近物源、短距离、快速搬运、快速堆积的特点。在8类岩石相中,以正韵律砂砾岩相、正韵律厚层含砾砂岩相和块状层理砂岩相为最有利的储集岩类,6种岩石相组合形式中,发育于分流河道亚相中的类型1和类型2最有利于油气的富集。 相似文献
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北马庄油田南部扇三角洲储集体沉积特征 总被引:2,自引:0,他引:2
扇三角洲砂体的沉积特征与碎屑供应、古地貌和沉积环境密切相关。为了认识北马庄油田南部扇三角洲储集体沉积特征,利用现代沉积学、测井学和地震勘探等手段,对沉积背景、沉积体系、沉积微相及沉积体平面和剖面特征进行详细剖析。识别了一种在沉积物供应缺乏、水体能量弱、断陷区发育的“饥饿型水下扇三角洲沉积体系”,表明北马庄油田南部扇三角洲储集体具有明显的重力流沉积特征,分流河道不发育,沉积砂体平面呈“裙边状”;砂体延伸较近,快速收敛,层薄,沉积砂体属近源快速堆积型;研究区湖面多期变化,南北沉积体发育呈多期旋回特征。 相似文献
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为了更深入认识储层空间展布及剩余油的分布规律,应用岩心、录井及测井资料,通过识别不同级次的构型界面,对辽河西部凹陷A区块于楼油层的储层构型进行了精细刻画,总结了单砂体在侧向、垂向及平面上的构型模式。研究认为:单砂体侧向可分为孤立型、对接型、切叠型3种构型模式,可进一步划分为水下分流河道、河口砂坝、水下分流河道间砂、水下分流河道间泥及前缘席状砂等5种四级构型要素;单砂体垂向构型可分为削截式水下分流河道、完整式水下分流河道、孤立式河口砂坝、多期叠加式河口砂坝、水下分流河道与河口砂坝的叠置等5种模式;单砂体的平面组合可分为孤立条带状河道、交织条带状河道、连片状河道等3种模式;正韵律层为蒸汽驱的优选层段、平面上呈孤立条带状的层段,可以考虑分层注气;部署注气井和采油井时,应优选连通性较好的构型结构内部。 相似文献
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扇三角洲沉积研究动态与进展 总被引:1,自引:0,他引:1
本文综述了对扇三角洲形成和发育的古地理和古构造环境、控制其沉积特征的主要因素和物理过程、地层模式和相模式、储层非均质及含油气特点等方面的深入研究和所取得的极大进展,使得从寒武纪到更新世的许多沉积在活动构造边缘的粗碎屑楔状体被重新解释为扇三角洲,从而对寻找矿床和油气都具有重要指导意义。 相似文献
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Cormorant Block IV is one of four, large-scale fault-bounded accumulations which together comprise the Cormorant oilfield. The field lies some 150 kms NE of the Shetland Islands, in the East Shetland Basin. Oil is trapped in the Middle Jurassic (Aalenian-Bathonian) Brent Group. Block IV is a separate accumulation in a downthrown area formed by a large synsedimentary listric fault, which produced a dome-shaped structure with further internal fault-block compartmentalisation. A concerted data-gathering effort on the accumulation included the coring of 43% of the reservoir section penetrated by wells. The Brent Group in Block IV fits into the “classical” overall regressive/transgressive, wavedominated delta model widely accepted for these sediments. However, the synsedimentary boundary fault has had some influence on the shallow-marine Broom and Tarbert Formations and the coastal-plain Upper Ness sediments, in each case preserving a unique and thicker sequence on the downthrown eastern side. The lowermost Broom Formation includes a shallow-marine, Gilbert-delta type deposit that infilled a topographic feature formed by the fault, and is genetically distinct from the rest of the Group. The Rannoch and Etive delta-shoreface sediments, the main resrvoir interval, appear to have prograded through the area towards the NNE so rapidly that no fault influence was felt. Lateral variability at this level can be explained by the location of distributaries in the upper shoreface, controlling the grade of sediment supply and progradation rates of the entire system. The barrier-attached coastal-plain sequence of the lower Ness is chronostratigraphically equivalent to the Etive. and thins rapidly towards the north. The upper Ness is strongly layered by repeated periods of emergent coastal-plain development separated by at least block-wide lagoonal drowning events. Erosion at the base of the shallow-marine Tarbert Formation, and the marked variability of sediment type and thickness in this horizon, suggests that it formed over a considerable time-period at the end of Brent Group deposition, as the structure of the block was still developing. 相似文献
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Submarine fans are important to the petroleum industry for their reservoir and source-rock potential. There are a variety of fan types that can be characterized by different fan models. In assessing which model, if any, is appropriate for a particular area or field it is important to evaluate the controls that operate to determine the type of fan developed. Most present-day fans that have been studied are deep-water oceanic; more work is required on modern examples of shallow-water, small-basin fans which are particularly relevant to hydrocarbon exploration.
Jurassic and Tertiary objectives are important in the North Sea and include both nearshore-sandstone and submarine fan reservoirs. The Brae oilfield is an Upper Jurassic reservoir on the western faulted margin of the North Sea Central rift system. Detailed core, electric log, dipmeter and seismic data have been examined. The Brae field comprises at least three small overlapping submarine fans that form a sediment apron along the scarp margin and that were deposited by a variety of gravity-flow processes in a shallow basin below wave base. Tectonic control on fan development has resulted in up to six fining upwards megasequences (50-150m) within the overall fining upwards basin fill (300–600 m). There has been a large intermittent supply of coarse detritus across a narrow littoral zone and down a steep slope. Short, sedimentladen rivers supplied mud and plant débris, and a complex interdigitation of coarse-and fine-grained facies has resulted.
The Brae fans are an important example of the fault-controlled, shallow, small-basin type and are most closely analogous to the Jurassic fans of East Greenland. Reservoir characteristics are dependent on diagenesis, facies and fault distribution, and vary markedly along the fault margin. A clear understanding of the controls and models is essential for continued exploration and development in this part of the North Sea. 相似文献
Jurassic and Tertiary objectives are important in the North Sea and include both nearshore-sandstone and submarine fan reservoirs. The Brae oilfield is an Upper Jurassic reservoir on the western faulted margin of the North Sea Central rift system. Detailed core, electric log, dipmeter and seismic data have been examined. The Brae field comprises at least three small overlapping submarine fans that form a sediment apron along the scarp margin and that were deposited by a variety of gravity-flow processes in a shallow basin below wave base. Tectonic control on fan development has resulted in up to six fining upwards megasequences (50-150m) within the overall fining upwards basin fill (300–600 m). There has been a large intermittent supply of coarse detritus across a narrow littoral zone and down a steep slope. Short, sedimentladen rivers supplied mud and plant débris, and a complex interdigitation of coarse-and fine-grained facies has resulted.
The Brae fans are an important example of the fault-controlled, shallow, small-basin type and are most closely analogous to the Jurassic fans of East Greenland. Reservoir characteristics are dependent on diagenesis, facies and fault distribution, and vary markedly along the fault margin. A clear understanding of the controls and models is essential for continued exploration and development in this part of the North Sea. 相似文献
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杏北油田断层十分发育,同生断层对砂体控制作用明显,认清断层与砂体分布的关系十分重要.以大庆杏北油田葡萄花油层为例,分析同生断层的生长特点,找出同生断层对砂体的控制作用,为最大限度地挖潜老油田剩余油提供有利证据.研究发现葡萄花油层部分断层为同生断层,同生断层活动时期主要为青山口组沉积时期、姚家组一嫩一二段沉积时期及嫩三四段沉积以后,断层强活动时期位于葡Ⅰ3单元沉积时期.同生断层在纵向上表现为断裂活动多期,横向上表现为断裂活动多段(分段生长)的特点.最终将断层特征与砂体分布相结合,阐明了同生断层对砂体分布的控制作用,总结出同生断层下降盘控砂和分段生长点控砂2种控砂模式. 相似文献
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克拉玛依油田530区P 总被引:3,自引:0,他引:3
向瑜章 《石油与天然气地质》2002,23(3):279-284
根据克拉玛依油田530区P2w1砾岩油藏的特点,采用二步建模法,即运用地震相、测井相、试井相及岩芯分析等资料建立储层沉积模式的序贯指示模拟法和既考虑沉积历史也考虑沉积机制,以得到储层有关属性参数空间分布的半马尔可夫模拟法,分别模拟了研究区沉积相和储层物性特征参数。从采用序贯指示模拟法建立的油藏沉积相静态模型可以看出,古水流自左上方进入沉积区,在断裂下降盘沉积了扇中、扇缘亚相,缺失扇顶亚相,XW3 沉积不连续,XW2 沉积变缓且更均匀。从采用半马尔可夫模拟技术建立的储层特征参数静态模型上可以看出,XW3 沉积厚度大、变化频繁,XW2 沉积厚度小,规律性更分明,XW3 孔隙度、渗透率值变化均大于XW2,而含油饱和度恰好相反。模拟预测认为,靠近克乌断裂带西段附近物性参数好于其他部位,是油气有利储集区,应为首选区。由于静态模型准确表达了油藏空间分布规律,因此减少布井 16口,节约进尺427×104m。 相似文献
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特低渗透断块油藏井网优化 总被引:2,自引:6,他引:2
通过海拉尔盆地贝中次凹南一段Ⅰ油组的地质、试采、开发特征的综合分析研究,主力开发层系Ⅰ油组属于特低渗透断块油藏,裂缝不发育,并建立南一段地质模型.对研究工区内探井、评价井各种资料数据统计分析,在考虑启动压力梯度条件下进行相关油藏工程计算,同时参考国内低渗透油田井网部署资料,综合油藏数值模拟方法得到南一段Ⅰ油组井网优化部署研究结果:矩形反九点,排距井距150 m ×250 m.综合南一段Ⅰ油组地质、开发现状特征,部署56口开发井,应用地质模型合理粗化数据体进行油藏数值模拟,实现15年开发指标预测,为油藏的合理开发投产起到一定借鉴和指导意义. 相似文献
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LIU Gang 《大庆石油地质与开发》2012,31(4)
古龙油田是松辽盆地最典型的向斜油藏,利用岩心、录井和测井等基础资料,从宏观和微观2方面研究了古龙北向斜葡萄花油层的油气富集规律.研究结果表明,断裂、沉积微相和地层压力因素为其宏观控制因素,而沉积韵律、砂体连通性和储层物性等微观因素对油水层的分布也起到一定的控制作用.结合储层厚度、物性、试油产量等资料,将全区分为3类有利区块并优选,合理安排动用次序,为古龙北油田向斜区葡萄花油层下一步的勘探与开发提供了依据. 相似文献
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临盘油田断裂系统非常复杂,断块油藏占90%以上.盘河构造西翼砂体十分发育,砂地比达70%,但封堵性仍然很好.早期的断层封堵理论——“砂砂见面不堵,砂泥见面封堵”和“泥岩涂抹”不能很好地解释盘河构造西翼沙四段断层封堵现象.为了弄清研究区断层封堵样式,对钻井、测井等地质资料进行分析,发现断层附近砂岩发生碳酸盐胶结充填是一种普遍现象,并对胶结充填带的成因和胶结变化带对油气的封堵作用进行分析,提出断层胶结充填封堵油气的观点.研究结果表明:研究区断层发育,断层附近砂岩物性急剧变差,自然电位几乎没有幅度,声波时差变小,而电阻率明显升高;油层多、累计厚度大,油柱高度却不大,一般20 ~ 40 m. 相似文献