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1.
Farouk I. Metwalli John D. Pigott Fatma S. Ramadan Ali A. El-Khadragy Waleed A. Afify 《Environmental Earth Sciences》2018,77(4):143
An integrated petrophysical well log and core data analysis of the Alam El Bueib-3D (AEB-3D) and Alam El Bueib-3E (AEB-3E) reservoirs, Tut oil field, North Western Desert, Egypt, allows the evaluation of those parameters critical to their reservoir characterization. The determined reservoir properties investigated are lithology, depositional paleoenvironments, shale volume, porosity, fluid saturation and net pay thickness. As the analysis of reservoir pressure is essential to specify the driving mechanisms that control the behavior of fluids within reservoirs, pressure analysis identified the Alam El Bueib-3D reservoir to be partial water drive and Alam El Bueib-3E to be an active water drive. In addition, the pressure analysis identified two additional hydrocarbon-bearing reservoirs in the Alam El Bueib-3D. Stacking patterns of the Alam El Bueib-3D reservoirs are generally fining upward sequences reflecting fluvial to braided fluvial paleoenvironments. The Alam El Bueib-3E channel shows blocky patterns with sharp bases and tops diagnostic of distributary channels. Statistical analysis of core permeability and porosity values of the Alam El Bueib reservoirs indicate very good reservoir quality. Scatter diagrams of porosity values derived from core analysis for the AEB-3D and AEB-3E reservoirs reveal correlation coefficient (r) values of 0.93 and 0.64, respectively, indicating strong linear relationships. Plots of porosity values against permeability values also show strong linear relationships in all the reservoirs indicating that the AEB-3D and the AEB-3E are permeable and with strong pore communication. The permeability measurements indicate restricted reservoir heterogeneity as plots of vertical permeability values against horizontal permeability values exhibit linear trends. Altogether, the reservoir characterization of the Alam El Bueib reservoirs demonstrates their excellent potential for hydrocarbon production. 相似文献
2.
笔者通过关键井的岩性,测井相和地震相的研究,认为东营凹陷广北地区的下第三系沙四段为滨湖亚相的砂坝,砂泥混合滩,泥滩等微相以及浅湖亚相的远砂坝,席状砂,浅湖泥等微相构成的滨湖沉积体系,由老到新的垂向上沉积演化为浅湖亚相（ES^64）－滨湖亚相（ES^34,ES^44,ES^54)－浅湖亚相（ES^14,ES^24),反映出水进－水退－水进的沉积旋回,通过地震剖面的对比和地震相的解释,建立和各沉积微相与地震相对应关系,探索不同沉积微相砂体中油气的富集规律。 相似文献
3.
陆丰凹陷珠江组发育的多套砂岩储层是珠江口盆地东部重要的产油层,但对这些储层沉积特征的研究程度不足制约了下一步的勘探部署。在岩心观察的基础上,结合测井资料、岩石学特征、矿物成分、沉积构造等对珠江组砂体储层沉积相类型和物性特征进行了分析。结果表明,研究区主要发育辫状河三角洲和滨岸两大沉积体系,并可进一步细分为分流河道、河口坝、远沙坝等10种沉积微相。不同的沉积相带控制不同砂体储集物性,按储层物性好坏,划分出3类沉积相带砂体储层。滩砂、滩砂水道、沿岸坝等砂体储层物性最好,上临滨、分流河道、河口沙坝次之,下临滨砂体最差。综合研究认为,寻找优质油气储层,应优先考虑最有利的形成优质储层的沉积相带。 相似文献
4.
湘西北永顺——龙山地区早志留世三角洲沉积 总被引：2，自引：0，他引：2
湘西北早志留世龙马溪期至溶溪期为三角洲沉积，可划分出前三角洲、三角洲前缘和三角洲平原三个亚相。前三角角洲亚相以龙马溪组为代表，已鉴别出原地泥页岩、浊积岩和底流沉积三一相，其中后二者主要见于龙马溪组 ；三角洲前缘亚相以小河坝且为代表，已鉴别出试状砂粒滩、礁间泥微相；三角洲平面亚相以溶溪组为代表，已鉴别出分流河道及沼沼泽微相。该三角洲沉积的特征是入海河流流速低而流量大，泥沙含量高而粒级细小，在三角洲前 相似文献
5.
为了揭示鄂尔多斯盆地马家山—小涧子油田砂岩成岩作用对储层的控制作用,综合采用了薄片鉴定、铸体薄片、压汞、扫描电镜、X-射线衍射和包裹体分析等多种方法。研究认为:该区延长组长61、长4 5段砂岩成岩作用进入了中成岩阶段的A期;成岩相的平面分布具有明显的规律性,由水下分流河道砂体及河口砂坝中心向边缘,直至水下分流间湾,依次发育溶蚀孔隙相、绿泥石胶结相、碳酸盐胶结相及压实杂基相4种成岩相类型;储层物性依次变差;有利的储集相带为水下分流河道砂体和河口砂坝中心的溶蚀孔隙相和绿泥石胶结相。 相似文献
6.
本文根据野外露头、测井及钻井岩心等资料,研究了鄂尔多斯盆地东北部石盒子组的层序充填样式和演化规律.于陆内坳陷盆地发展阶段的高潮期以充填辫状河三角洲为特征,相对稳定期以充填曲流河三角洲为特征;陆内坳陷盆地的成熟阶段以充填网结河三角洲为特征.各时期的三角洲具有"大平原、小前缘"的特点,这为河道的形成演化和砂体富集提供了空间.提出研究区内最有利储集相带为辫状河三角洲的分流河道(A1型)、水下分流河道(A2型);曲流河三角洲的分流河道(A2型)、水下分流河道(A2型)和网结河三角洲分流河道的结点(C1型)亦是较有利储集体.总之,基准面的旋回控制的古地理面貌和层序充填规律对鄂尔多斯盆地岩性油气藏的形成具有重要意义. 相似文献
7.
鄂尔多斯盆地史家湾地区长6油层组层序-岩相古地理 总被引：1，自引：0，他引：1
通过岩心描述、岩石薄片鏊定和古生物、物源区和测井曲线等资料的综合分析,对鄂尔多斯盆地史家湾地区上三叠统长6油层组沉积相和层序地层学特征进行了详细研究,确定长6油层组属于河控型三角洲沉积体系.可划分为1个长期、3个中期和10个短期旋回层序.以古盐度的定量计算和盐度分区为依据,进一步确定了史家湾地区长6油层组沉积期的古湖岸线位置.在此基础上,以物源区和沉积相、层序分析成果为基础,选取中期旋回层序的上升和下降相域为等时地层单元编制史家湾地区长6油层组各时期层序-岩相古地理图,结果表明各时期古地理面貌和砂体展布格局主要受湖平面升、降和物源区方向控制.最有利储层发育的水上一水下分流河道主要出现在各中期旋回的湖侵相域,砂体的延伸方向与东北部的主物源方向相平行,此研究成果对史家湾地区长6油藏的后续勘探有重要的指导意义. 相似文献
8.
为了更精准地研究鄂尔多斯盆地西南部华庆地区上三叠统延长组长6_2-6_3油层组储层特征,运用岩心照片、测井数据、粒度分析、录井数据等资料,对延长组长6_2-6_3油层组的岩性、碎屑颗粒、构造、测井响应、生物标志以及接触关系进行了分析研究。分析了长6油层组沉积微相特征,识别出该沉积时期半深湖-深湖亚相和三角洲前缘亚相两类沉积亚相,半深湖泥、浊积岩、砂质碎屑流砂体、水下分流河道、分流间湾和席状砂6类沉积微相,并分析华庆地区延长组长6_2-6_3期沉积相发育演化过程。沉积微相精细化描述揭示了华庆地区延长组6段油层组沉积环境,为精细化勘探开发提供地质依据。 相似文献
9.
通过岩心观察、沉积构造、矿物学特征、测井数据对松辽盆地南部永平地区泉四段进行沉积微相的判别,划分为湖泊相和曲流河三角洲相,包含2种亚相和3种微相。借助JF229井区密井网条件进行精细小层对比和砂体拆分,将永平地区泉四段划分为12个小层,按时间关系划分为9期河道,以此为依据研究该区沉积演化过程并总结沉积模式。泉四段早期,全区主要发育较稳定的三角洲前缘沉积。10小层时期伴随有一次短暂的湖侵-湖退,而后迅速恢复三角洲前缘沉积;泉四段末期从4小层开始发生广泛湖侵。结合连井剖面,进一步研究河道性质及演化特征,为追索有利砂体提供依据。 相似文献
10.
中伊朗盆地Garmsar区块Qom组沉积微相及储层特征研究 总被引：1，自引：1，他引：0
伊朗Garmsar区块Qom组形成于碳酸盐岩台地沉积环境,岩性以生物屑灰岩、含砂生物屑灰岩、泥晶灰岩为主,是典型的裂缝~孔隙型储层。利用区内野外实测剖面资料和露头岩样测试资料,对Qom组沉积相进行标识及类型划分,并对Qom组沉积微相及其平面展布特征进行分析,指出了该区域开阔台地相~高能红藻滩微相和局限台地相~泻湖夹台内滩微相是研究区储层发育的有利部位。F段中部的粒内溶孔较为发育,而溶缝主要出现在C1、C3亚段,整个Qom组构造微裂缝不甚发育。但储层孔渗条件比较差,属于中~低孔、低渗~特低渗储层,且存在严重的不均一性。为此,从沉积相与储层特征角度研究认为,中伊朗盆地Garmsar区块Qom组油气勘探存在一定的风险。 相似文献
11.
Deep channel sedimentation in the Lower Cretaceous McMurray Formation, Athabasca Oil Sands, Alberta 总被引：2，自引：0，他引：2
ABSTRACT In the region of the Athabasca Oil Sands, Alberta, the Lower Cretaceous McMurray Formation comprises 50-80 m of uncemented quartz sand and associated shale, saturated throughout by bitumen. The sediments are dominantly of continental origin, except in the uppermost parts of the formation where sedimentation was influenced by the encroaching boreal sea.
In most outcrop and mine face exposures of the McMurray Formation, a sequence of three facies is recognized. In ascending order these are: (1) an erosionally based thick-bedded sand facies, 2-20 m thick, dominated by large-scale trough cross-beds; (2) an epsilon cross-stratified facies with solitary sets up to 25 m in thickness, consisting of decimetre to metre thick couplets of sand/mud, with depositional slopes of 8-12° and palaeocurrent indications parallel to the strike of the epsilon cross-set; and (3) a horizontally bedded argillaceous sand facies up to a few metres thick. The three-fold sequence is interpreted as a single upward-fining cycle of channel sedimentation, the trough cross-bedded sands resulting from channel bottom deposition, the epsilon cross-strata accumulating by lateral accretion of channel point bars, and the upper argillaceous sand representing floodplain sedimentation. Where the McMurray Formation is relatively thin (less than 50 m), virtually the entire formation is commonly composed of a single upward-fining channel deposit.
Details of the size and physiographic setting of the channels are somewhat uncertain, but the present evidence suggests that the epsilon-dominated McMurray Formation sequence in the Athabasca Deposit region represents the coastal plain culmination of a very large fluvial drainage system. 相似文献
In most outcrop and mine face exposures of the McMurray Formation, a sequence of three facies is recognized. In ascending order these are: (1) an erosionally based thick-bedded sand facies, 2-20 m thick, dominated by large-scale trough cross-beds; (2) an epsilon cross-stratified facies with solitary sets up to 25 m in thickness, consisting of decimetre to metre thick couplets of sand/mud, with depositional slopes of 8-12° and palaeocurrent indications parallel to the strike of the epsilon cross-set; and (3) a horizontally bedded argillaceous sand facies up to a few metres thick. The three-fold sequence is interpreted as a single upward-fining cycle of channel sedimentation, the trough cross-bedded sands resulting from channel bottom deposition, the epsilon cross-strata accumulating by lateral accretion of channel point bars, and the upper argillaceous sand representing floodplain sedimentation. Where the McMurray Formation is relatively thin (less than 50 m), virtually the entire formation is commonly composed of a single upward-fining channel deposit.
Details of the size and physiographic setting of the channels are somewhat uncertain, but the present evidence suggests that the epsilon-dominated McMurray Formation sequence in the Athabasca Deposit region represents the coastal plain culmination of a very large fluvial drainage system. 相似文献
12.
Ardiansyah Koeshidayatullah Khalid Al‐Ramadan Geraint Wyn Hughes 《Geological Journal》2016,51(5):704-721
The Al‐Jawf area of northern Saudi Arabia provides spectacular outcrops of Early Devonian carbonate bioherms in the Wadi Murayr and Dumat Al‐Jandal areas. These carbonate bioherms belong to the Qasr Member of the Late Pragian–Early Emsian Jauf Formation (~405 Ma) and are surrounded by a bioclastic carbonate succession. The Qasr Member is the first major carbonate unit of the Palaeozoic succession in Saudi Arabia that mainly consists of microbialite carbonates and metazoan reefs exhibiting distinct mound features. These bioherm complexes and their associated carbonate facies are pervasively dolomitized. Stratigraphic, petrographic and geochemical analyses were conducted to determine the facies distribution and interpret their depositional and diagenetic processes. A total of 11 facies are identified from a range of depositional environments within a carbonate platform system, ranging from tidal flats, lagoon, shoal, patch reefs to reef front. The main diagenetic processes are carbonate cementation and dolomitization. Dolomitization occurred as both fabric preserved (mostly in grain‐dominated facies) and fabric destructive (mud‐dominated facies). The microbialites and coralline sponges facies show poor reservoir with visual porosity less than 5%, but this succession may have a potential to serve as a good source for the underlying and overlying facies. Ooid and peloidal grainstone facies show fair to good visual porosity that locally exceeds 10% with intergranular porosity as the dominant type. However, in the most studied samples, vuggy and intraparticle porosities are observed as the dominant type. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
13.
鄂尔多斯盆地富县地区上三叠统延长组砂质碎屑流沉积特征及其油气勘探意义 总被引：5，自引：1，他引：4
通过岩芯观测、地震解释和测井分析,结合薄片观察、粒度分析以及各种资料的综合分析,对鄂尔多斯盆地南部富县地区上三叠统延长组沉积相类型及特征进行深入研究,提出长9-长6油层组存在砂质碎屑流沉积。结合盆地沉积背景及其演化规律,探讨了砂质碎屑流沉积的成因机制, 详细论述了砂质碎屑流沉积的沉积特征,建立了砂质碎屑流的沉积模式。研究表明砂质碎屑流砂体主要由块状粉细砂岩和含泥砾粉细砂岩两种成因相构成,其成因是三角洲前缘砂体在外界触发力作用下,滑动崩塌而形成。分析了砂质碎屑流沉积与油气的分布关系,实践表明砂质碎屑流沉积体是下生上储或下储上生的油藏类型,属于典型的岩性油气藏,构成了该区深水区域的良好岩性圈闭储集体。 相似文献
14.
综合应用测井曲线、岩心、野外露头剖面等资料,分析鄂尔多斯盆地陇东地区延长组的层序地层特征及沉积相,在延长组识别出4个三级层序界面,将延长组分为4个三级层序10个体系域,识别出4种主要的沉积体系:扇三角洲、辫状河三角洲、曲流河三角洲及湖泊沉积体系。分析了各体系域沉积体系的平面展布特征,探讨了体系域沉积模式及层序与油气的关系。指出低位体系域中发育的三角洲平原河道及前缘水下分流河道砂体是最主要的储层,水进及高位体系域中发育的浊积岩砂体分布面积大,是潜在的储层、水进和高位体系域中发育的湖相泥、页岩是良好的生油层和盖层,使得陇东地区存在有利的生储盖组合,处于有利的含油气系统之中,具较好的油气勘探前景。 相似文献
15.
运用地震、岩心、钻测井和古生物等资料,对苏北盆地白驹凹陷泰州组进行了层序地层和沉积相分析,在泰州组地层中可识别出3个层序界面,划分出2个三级层序(SQ1、SQ2)和4个体系域。根据沉积相标志,在泰州组沉积体中识别出了辫状河三角洲、(曲流河)三角洲及湖泊3种沉积相类型,并进一步划分为8种亚相和17种微相。其中,SQ1沉积于盆地初始断陷期,以发育辫状河三角洲为特征;SQ2低位体系域沉积时期,盆地的拉张作用增加,湖盆范围扩大,(曲流河)三角洲沉积最为发育;SQ2湖侵体系域和高位体系域沉积时期,盆地发育由断陷湖盆转为坳陷湖盆,湖侵体系域湖泊沉积范围最广,主要为半深湖—深湖亚相沉积环境,高位体系域湖平面略有下降,以滨浅湖沉积环境为主。指出白驹凹陷生油层主要发育于SQ2湖侵体系域,其本身又是良好的盖层;而储集层则主要发育在SQ1-SQ2低位体系域以及SQ2高位体系域,之间相互组合形成了2套生储盖组合,生储盖的良好配置使白驹凹陷发育的辫状河三角洲前缘水下分流河道、三角洲前缘水下分流河道、席状砂以及滨浅湖砂滩、砂坝砂体成为有利的油气勘探区。 相似文献
16.
成都市洛带地区沙溪庙组沉积相及储集条件分析 总被引：3，自引：0，他引：3
洛带地区沙溪庙组为河流-三角洲相沉积，“上沙”(J2s)储集砂体发育，经井间对比，划分出11套砂体，砂体呈条带状，沿NE—SW向构造展布，反映物源主要来自NE方向。储层主要为中一细粒岩屑长石砂岩，储层物性条件与新场“上沙”储层相似，但地层电阻率较低。目前已在遂宁组(J3sn)和“上沙”储层中发现了孔隙性储层，孔隙类型主要是次生孔隙，这对在洛带气田深层寻找孔隙性的气藏提供了重要依据。 相似文献
17.
Sedimentary Micro-facies and Macro Heterogeneity of Reservoir Beds in the Third Member of the Qingshankou Formation,Qian'an Area,Songliao Basin 
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下载免费PDF全文 Reinhard F.SACHSENHOFER 《《地质学报》英文版》2007,(6)
An analysis of drill cores and well logs shows that the main micro-facies of the third member sand bodies of the Qingshankou Formation in Qian'an are subaqueous distributary channel facies, sheet sand facies and subaqueous fan facies(olistostrome).Maps showing the distribution of these micro-facies together with inter-channel bay and prodelta mocro-facies are presented for different time-slices(lower,middle and upper parts of the Qingshankou Formation).These maps reveal the instability and change of sediment transport in the Baokang sedimentary system during the depositional period.Sediment transport was from the west in the early stage,from the south in the middle stage and from the northwest in the late stage.Values of thickness,porosity and permeability of the sand bodies in the third member of the Qingshankou Formation show that they have low to medium porosity and low permeability,and are characterized by serious reservoir heterogeneity.The joints between micro-facies and subaqueous fan micro-facies are characterized by the highest heterogeneity, the sheet sand and distal sand bar subfacies come next,and the heterogeneity of the subaqueous distributary channel sand bodies is relatively weak. 相似文献
18.
Multi-layer sandstone reservoirs occur globally and are currently in international production. The 3D characteristics of these reservoirs are too complicated to be accurately delineated by general structural-facies-reservoir modelling. In view of the special geological features, such as the vertical architecture of sandstone and mudstone interbeds, the lateral stable sedimentation and the strong heterogeneity of reservoir poroperm and fluid distribution, we developed a new three-stage and six-phase procedure for 3D characterization of multi-layer sandstone reservoirs. The procedure comprises two-phase structural modelling, two-phase facies modelling and modelling of two types of reservoir properties. Using this procedure, we established models of the formation structure, sand body structure and microfacies, reservoir facies and properties including porosity, permeability and gas saturation and provided a 3D fine-scale, systematic characterization of the Sebei multi-layer sandstone gas field, China. This new procedure, validated by the Sebei gas field, can be applied to characterize similar multi-layer sandstone reservoirs. 相似文献
19.
《Quaternary Science Reviews》2007,26(22-24):2883-2896
In the El Minia district of northern Upper Egypt, the Pleistocene deposits of the Nile Valley include (?)Early Pleistocene conglomerates of the Armant Formation and (?)Middle Pleistocene sands of the Qena Formation. These sediments are exposed along both sides of the valley in terraces at different heights, unconformably overlying Eocene limestones. Field observations suggest that the conglomerate facies of the Armant Formation was deposited in proximal and mid-alluvial fans. The sands of the Qena Formation are differentiated into two facies: a cross-bedded sandstone, representative of alluvial fan—braided stream environments, and a facies of sand interbedded with mud that may have been deposited by a meandering river. The heavy minerals of the Armant Formation are markedly different from those of the Qena Formation, suggesting derivation from different sources. Surface textures of quartz grains from the Qena sands, observed by SEM, exhibit chemical features, attributed to a fluviatile origin. Sand from the Armant Formation is characterized by mechanical and chemical surface textural features that suggest original aeolian derivation followed by later fluvial sedimentation. 相似文献
20.
松南海坨子—大布苏地区泉四段— 姚家组层序地层研究 总被引：2，自引：1，他引：1
根据工区内现有的钻井、测井和地震资料,应用以多级次基准面旋回为参照面的高分辨层序地层学理论与研究方法,对松辽盆地南部海坨子—大布苏地区的泉四段—姚家组地层进行了详细的层序地层研究,共识别出5个长期基准面旋回（相当于三级层序）,9个中期基准面旋回（相当于四级层序）,建立了研究区的层序划分方案,在连井剖面的层序地层对比基础上,建立了该区的地层格架,并对层序构成特征进行了分析,研究了储集层在层序格架内的分布规律,揭示出浊积砂体和三角洲前缘相的分流河道形成于基准面上升期,三角洲前缘相的河口坝、远砂坝和席状砂沉积形成于基准面下降期,指出浊积砂体和三角洲前缘相的远砂坝、席状砂沉积是研究区形成岩性油气藏的有利储集体。 相似文献