首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 31 毫秒
1.
The mainpurpose of this article is to demonstrate the utility of stratal slice images for exploring the sequence stratigraphy and sedimentology of complex depositional systems. A seismic sedimentological study was performed to map sediment dispersal characteristics of the Neogene Shawan Formation in the Chepaizi Uplift of the Junggar Basin, China. The Chepaizi Uplift is developed on the Carboniferous igneous rock basement that lies at the western boundary of the Junggar Basin. The data sources primarily include lithology, well-logging and seismic data. In the main target strata, the Neogene Shawan Formation can be divided into three fourth-order sequences (SQN1s1, SQN1s2, and SQN1s3), and the sequence SQN1s1 is subdivided into three fifth-order sequences (SQN1s11, SQN1s12, and SQN1s13). Based on the established fine-sequence stratigraphic framework, the sedimentary facies types have been identified, they are shallow braided-river deltas, fan deltas, littoral and sublittoral lakes, braided rivers, and terminal fans. Then, stratal slices have been used to clearly depict the boundaries of sedimentary facies. Accurate results have been obtained that characterize braided river channels, terminal fans, littoral and sublittoral lake beaches, and subaqueous distributary channels in the braided-river delta front. Additionally, this seismic sedimentology study reflects variations in source area and evolution history.  相似文献   

2.
An important hydrocarbon reservoir is hosted by the third member of the Shahejie Formation (Es3) in the Zhanhua Sag, Bohai Bay Basin. Seismic stratal slices reveal different characteristics of channels and fan-delta lobes between the south (slope break belt) and southwest (gentle slope) areas combined with lithology, wire-line logs and three-dimensional (3-D) seismic data in the southern slope of Zhanhua Sag. And an excellent analogue has been provided for understanding various key depositional evolution of fan-deltas in the slope system (from base to top: Es3L, Es3M and Es3U). The Sedsim, a three-dimensional stratigraphic forward modelling programme, is applied to simulate the evolution of fan-deltas in the southern slope break systems and southwestern gentle slope systems of the Zhanhua Sag by considering a number of key processes and parameters affecting the fan-deltaic deposition from 43 Ma to 38.2 Ma. Modelling results indicate that depositional types and scales evolved from the thickest medium-scale gravel- or sand-rich fan deltas (43 Ma ∼41.4 Ma, Es3L) to the thinnest small-scale mud-rich fan deltas and lacustrine mud (41.4 Ma ∼39.8 Ma, Es3M), and lastly to less thicker larger-scale mixed sand-mud fan deltas (39.8 Ma ∼38.2 Ma, Es3U). The types of slope system, sediment supply and lake-level change are three controlling factors for determining the source-to-sink architecture of the gravel-to mud-rich fan-deltas and sediment-dispersal characteristics. This study has demonstrated that the process-based modelling approach can be effectively used to simulate complex geological environments and quantify controlling factors.  相似文献   

3.
以层序地层学为理论指导,通过对地震、钻井、测井及古生物等资料的研究,建立了北黄海盆地东部坳陷东南部的层序格架。研究区的中生界可分为1个一级层序、2个二级层序、5个三级层序,在此层序格架内进行了沉积相划分及沉积体系研究,厘定了扇三角洲、辫状河三角洲、浊积扇和湖泊沉积等4种沉积体系。断陷早期,JSQ1的西部与东部分别发育了中型的扇三角洲与辫状河三角洲沉积体系;断陷中期,西部的扇三角洲沉积体系逐步扩展并在其前端多发育小型浊积扇,东部的辫状河三角洲沉积体系亦持续扩张且在JSQ4沉积期规模达到最大;断陷晚期,KSQ1内仅发育盆缘的小型扇体和滨浅湖相沉积,东部、南部隆起区未接受沉积或沉积较薄并剥蚀殆尽。沉积体系的平面展布和纵向演化受古构造与古地貌的控制。  相似文献   

4.
珠江口盆地恩平凹陷恩平组是重要的油气储层,但受钻井资料较少且分布不均匀的限制,应用常规手段无法进行精细的储层预测。利用地震多属性分析技术,结合测井曲线及区域地质资料,对恩平凹陷恩平组进行了精细的地震解释。根据珠江口盆地恩平凹陷高精度的三维地震和钻井等资料,将恩平组分为PSQ1、PSQ2、PSQ3 3个三级层序。基于建立的等时层序地层格架,表明恩平组发育辫状河三角洲相、扇三角洲相和滩坝相3种类型的沉积相。研究成果对恩平凹陷下步的油气勘探具有重要的指导意义。  相似文献   

5.
运用珠江口盆地新采集的高分辨率多道地震资料,结合前人在本区的钻井、岩心、测井曲线及地震的综合资料,建立了白云凹陷北坡上新世-第四纪的等时地层格架,在此基础上分析了陆架边缘典型沉积体系,并初步探讨了其控制因素。研究表明,上新世-第四纪地层内识别出T0(海底)、T1(1.8 Ma)和T2(5.3 Ma)3个三级层序界面,划分出A、B 2个三级层序。研究区地震相主要有席状平行-亚平行地震相、帚状前积地震相、透镜状前积地震相、谷状充填地震相,不同的地震相及其组合代表特定的沉积体系。地震相特征分析表明,研究区上新世-第四纪发育大规模的陆架边缘三角洲和深切水道群,深切水道是沉积物向下陆坡-深海盆输送的通道。白云凹陷北坡上新世-第四纪沉积体系的发育受陆架边缘的地形、海平面升降、沉积物供给等因素的控制。  相似文献   

6.
利用岩心、测井、地震、岩石薄片、分析化验等资料,对鄂尔多斯盆地苏里格气田苏东区块山西组山1、山2段沉积微相进行了研究。研究结果表明,苏东气田东北地区山西组山1、山2段发育了洪泛曲流河沉积体系,主要沉积微相有曲流河道、边滩、河漫滩、河道间等微相类型。在沉积环境分析的基础上,进一步研究了区内沉积微相的平面展布特征及其演化规律,认为区内山2沉积期:发育曲流流河道砂体,储层以褐色含砾中粗粒岩屑石英砂岩-细砾岩为主,并且沉积期为近物源区的冲积平原河流相沉积,受潮湿气候及弱水动力沉积环境的影响,大面积发育河漫沼泽沉积,为煤层提供了温床,纵向上形成了3~5套煤层,物源供给相对充沛,形成了一定厚度的曲流河道块状砂体沉积;山西组山1沉积期:受潮湿气候的影响,广泛发育湿地河漫湖泊、河漫滩沉积。  相似文献   

7.
“源-储”配置关系认识不清制约了西江主洼古近系油气勘探。依托地震、钻井、古生物等资料,厘定识别出5个层序界面和4个三级层序。建立了西江凹陷北部受先存断裂差异活化及应力场转变主控的迁移型层序演化模式:裂陷初始期(代表层序WCSQ1),多中心分段发育;东部强裂陷期(WCSQ2),东厚西薄、NE向“窄条”状展布;裂陷转换期(WCSQ3),西厚东薄,NE向席状展布;裂陷萎缩期(WCSQ4),近席状展布。文昌组发育辫状河三角洲、扇三角洲、湖相3种沉积体系,识别出2种主要的沉积充填特征:①WCSQ2“陡坡型”半地堑,深湖窄盆,富泥少砂;②WCSQ3“坡坪式”半地堑,深湖宽盆,砂泥共存。明确了烃源岩-储层配置关系:中深湖相优质烃源岩主要位于WCSQ2东部和WCSQ3西部洼陷中心;辫状河三角洲储集体主要发育于缓坡带WCSQ3和WCSQ4; 扇三角洲储集体主要发育于陡坡带WCSQ2和WCSQ3。  相似文献   

8.
The Bohai Bay Basin is a classic non-marine rift basin in eastern China. The Paleogene Dongying sequences are the main hydrocarbon-bearing stratigraphic unit in the basin. Using three-dimensional (3-D) seismic data and one well control in the BZ3-1 Block in the western slope of the Bozhong Sag, we analyzed 3-D facies architectures of the Dongying sequences. The Dongying Formation, a second-order sequence, can be subdivided into four third-order sequences (from base to top: SQ1, SQ2, SQ3, and SQ4). The facies architecture was analyzed by using the seismic sedimentology approach based on 3-D seismic data. Sediment of the Dongying sequences was derived from the northern Shijiutuo Uplift via four major configurations of incised valleys, namely “V”, “U”, “W”, and composite shaped incised valleys. Seismic stratal slices reveal branching and converging characteristics of the channels from upstream to downstream. On the basis of an integrated analysis of well log, core data, seismic facies based on multi-seismic attributes, three sedimentary facies (e.g., “delta”, “fan-delta”, and “shore” or “shallow lacustrine” facies) have been recognized. The four types of incised valleys and their evolution control the sedimentary systems in the sedimentation area. The numbers and sizes of the fans are controlled by the sedimentary systems at various scales. Incised valley-fill and deltaic sand bodies are excellent hydrocarbon reservoirs and potentially good exploration targets for the study area. The reservoir quality of sequences SQ1, SQ2, and SQ3 become better gradually from base to top. The proposed sediment dispersal patterns may aid in the prediction of potential reservoir distribution. This study also demonstrates that facies architecture analysis using sequence stratigraphy and seismic sedimentology may serve as an effective approach for constructing 3D facies models for petroleum exploration in areas lacking of well or outcrop data.  相似文献   

9.
南黄海盆地北部坳陷古近系沉积特征及其沉积演化   总被引:1,自引:0,他引:1  
南黄海盆地经历了多年油气勘探,无论是在中生界还是新生界,至今未获得油气突破。新生界储层具有优越的储集条件,故重点分析了古近系阜宁组和三朵—戴南组的沉积特征及其沉积演化特征。以钻井和测井资料为基础,将阜宁组和三朵—戴南组划分为4种沉积相类型,即河流相、扇三角洲相、三角洲相和湖相,其中河流相在研究区可划分为辫状河流相和曲流河流相;并且分析了各沉积相、沉积亚相和沉积微型的岩电性特征。仔细解剖地震反射特征,进行阜宁组和三朵—戴南组地震相分析,以单井相分析为基础,解析各地震相沉积意义。根据瓦尔特定律,将单井沉积相分析与地震相分析充分结合,分析各层段沉积相分布特征。阜宁组主要发育曲流河流相、扇三角洲相、滨浅湖相和半深湖相;三朵—戴南组主要发育辫状河流相、扇三角洲相和滨浅湖相。根据区域构造演化特征,结合沉积相分析,深入分析了研究区古近系阜宁组至三朵—戴南组的沉积演化特征。  相似文献   

10.
During deposition in the Palaeogene, the Pearl River Mouth Basin (Enping Sag) was filled by sediments derived from northern and southern source regions. The northern sources are the fold belt Caledonian and Hercynian metamorphic rocks that are widely exposed along the South China block and stacked with Mesozoic igneous rocks, and the southern sources are Mesozoic igneous rocks from the southern Panyu lower uplift. We analysed the characteristics of the provenance and sediment-dispersal patterns of the beach and bar systems in the Palaeogene third-order sequence framework on the basis of detritus, thin section, zircon and the geophysical response test data. The source and deposition areas were distinguished based on their palaeogeomorphology. The sedimentary material composition of the deposition area was determined based on the characteristics of the detrital assemblage and cathode luminescence, and the characteristics of the age distribution were determined in detail using detrital zircon U–Pb dating. This study suggests that the provenance system in the Palaeogene mainly consisted of Palaeozoic metamorphic rocks and Mesozoic igneous rocks, with a supplement of Proterozoic metamorphic rocks. The transport capacity of three large fault troughs that delivered the northern provenances gradually increased from the Wenchang Formation (E2w) to the Enping Formation (E3e), whereas the southern provenances were transported by four or five incised valleys in E2w and then submerged in E3e. In the 3D seismic area, the features of the beach and bar sedimentary systems were described and interpreted based an analysis of the well-based sedimentary facies, seismic reflection characteristics and multiple attribute clustering. The results show that the beach and bar systems by the short-axis braided deltas mainly developed in the upper member of E2w and that the beach and bar systems on the subaqueous high in E3e developed during the Palaeogene. In addition, the bedrock-beach bar sedimentary system in the lower member (E3eL) was transferred to the braided delta–beach bar sedimentary system in the upper member (E3eU).  相似文献   

11.
济阳坳陷博兴洼陷西部沙三段层序地层   总被引:1,自引:0,他引:1  
选取以基准面为参照面的高分辨率层序地层学的理论与分析技术,对博兴洼陷西部沙三段开展层序地层分析工作。在博兴洼陷沙三段识别出5个层序界面和4个较大规模的洪泛面,由此将研究层段划分为4个长期基准面旋回(相当于3级层序),并通过长期旋回内部次级转换面的识别,细分出8个中期旋回(大致相当于4级层序)。通过对比建立了研究区的高分辨率层序地层格架,并分析了各层序的地层发育特征。以层序格架为基础,探讨了研究区各层序的沉积演化特征,建立了辫状三角洲—浊积扇层序发育模式,认为研究区辫状三角洲和浊积扇均具有加积作用特点;斜坡区为辫状三角洲发育区,而洼陷区为浊积扇发育区;中期基准面旋回下降期辫状三角洲发育,上升期浊积扇发育;浊积扇体的发育规模与湖泛规模相关。综合分析认为,浊积扇是形成岩性圈闭的主要储集砂体类型,其发育的有利层位是MSC8、MSC7、MSC6、MSC5旋回的上升半旋回,岩性圈闭发育的有利区是博兴南部斜坡坡折带之下的洼陷区。  相似文献   

12.
按河道形态,河流分为4类:(1)顺直河;(2)曲流河;(3)辫状河;(4)网状河。根据河道砂岩体主体的宽(w)与(h)高之比,河道砂岩体分为带状砂岩体(w∶h小于15)和席状砂岩体(w∶h大于15)。在参考前人资料的基础上,总结了在横切河道的地震剖面上河道砂岩体的反射形态、结构及振幅变化。重点介绍了曲流河内侧沙洲地震勘探,以及三维地震勘探技术在寻找河道砂岩体方面的应用。并强调指出,在河道砂岩体地震勘探中,应当加强地震资料与钻井资料、测井资料的结合。  相似文献   

13.
The evolution of large-scale paleo-uplifts within sedimentary basins controls the sedimentary provenance, depositional systems and hydrocarbon distributions. This study aims to unravel changes in paleo-geomorphology, interpret sedimentary sequence evolution, and investigate favourable reservoir types and the hydrocarbon distribution during the buried stage of a long-term eroded paleo-uplift, taking the Lower Cretaceous Qingshuihe Formation (K1q) in the Junggar Basin as an example. These research topics have rarely been studied or are poorly understood. This study integrates current drilling production data with outcrop and core analyses, drilling well logs, 3D seismic data interpretations, grading data, physical property comparisons and identified hydrocarbon distributions.After more than 20 million years of differential river erosion and weathering in arid conditions, the large-scale Chemo paleo-uplift within the hinterland area of the basin formed a distinctive valley–monadnock paleo-geomorphology prior to the deposition of K1q. Since the Early Cretaceous, tectonic subsidence and humid conditions have caused the base level (lake level) to rise, leading to backfilling of valleys and burial processes. Two systems tracts in the target strata of K1q, consisting of distinctive depositional systems, can be identified: (1) a lowstand systems tract (LST), which is confined within incised valleys and is mainly composed of gravelly braided rivers and rarely occurring debris flows and (2) an extensive transgressive systems tract (TST), which developed into an almost flat landform and consists of braided river delta to lacustrine depositional systems. Overall, the physical properties of braided river reservoirs in the LST are better than those of the braided river delta reservoirs in the TST. However, the inhomogeneous distributions of carbonate cements cause differences in the physical properties of conglomerate reservoirs in the LST. However, for sandstones in both the LST and TST, coarser grain sizes and better sorting result in better physical properties. Altogether, four types of reservoir can be identified in the study area: Jurassic inner monadnock reservoirs, K1q LST stratigraphic onlap reservoirs, LST structural reservoirs and TST structural reservoirs.  相似文献   

14.
立足"大歧口"凹陷,基于海、陆资料,在统一地层格架的基础上对沙河街组的沉积特征进行了整体研究,并对比了海、陆砂体发育的差异性,探讨了砂体发育差异性对海、陆油气成藏的影响。研究认为,歧口凹陷沙三段富砂沉积体系类型以扇三角洲为主,其次为辫状三角洲;沙二段以辫状三角洲为主,其次为扇三角洲和远岸水下扇。西侧中石油矿区主要受北、西两大盆外物源的影响,沙河街组砂体延伸远、规模大;东侧中海油矿区主要受南、东2个较小盆内物源影响,砂体延伸较近,规模较小。沙河街组砂体发育的差异性使得歧口主凹向海、陆两侧的汇烃比例约为1:2,这也是海、陆目前油气发现悬殊的主要原因之一,但海域仍然有较大的勘探潜力,沙西南裙边带沙河街组是中海油下一步在歧口凹陷勘探的有利方向。  相似文献   

15.
针对研究区曲流河储层横向变化快,井少难以控制横向展布的问题,充分应用地震属性对曲流河河道的约束能力,在沉积模式指导下,应用井-震结合研究该区储层展布规律。通过井与平面地震属性结合研究河道的展布方向及规律,利用连井剖面与地震属性剖面结合认识河道边界,进而掌握了曲流河河道在平面展布和纵向上叠合规律,明确了该区主力储层的发育特征,有效解决了井少条件下难以控制储层横向变化的问题,研究成果有效支撑了该区的开发井部署。  相似文献   

16.
东海盆地A凹陷B构造油气勘探中一直存在着中深层沉积体系展布特征不明确和储层甜点发育规律不清晰等基础地质问题。针对这一问题,运用地震精细解释和地质综合分析的方法,利用重处理的高精度宽频地震资料开展了地震沉积学和全频带信息挖掘研究,结合区域地质认识和已钻井地质分析,认识到B构造C段沉积时期发育了东、中、西3条大型曲流河河道带,在中支和西支河道带中发现了3个典型的频率异常发育区,油气检测技术证实是潜在的含气构造,表明B构造C段发育受河道带控制的构造-岩性气藏,为A凹陷B构造中深层油气勘探提供了地质依据,具有重要的勘探实践意义。  相似文献   

17.
东海陆架盆地丽水凹陷是重要的油气勘探区。为了加快浅层始新统温州组岩性圈闭勘探,利用新采集的三维地震、地质资料,运用层序地层学理论方法,对温州组进行层序地层划分,将其划分为SQ1、SQ2、SQ3共3个三级层序,其中,SQ1发育典型的低位、海侵和高位体系域,SQ2仅发育海侵和高位体系域。各体系域地震反射终止关系和地震相差异明显。本次研究重点是对SQ1低位域沉积平面展布特征进行刻画。SQ1低位域发育浪控三角洲-浊积扇沉积体系,沉积微相以三角洲前缘滨岸砂坝和薄层灰岩浅滩为主,垂向叠置样式以进积为主。根据浪控三角洲和浊积扇的沉积特征,建立了温州组SQ1低位域浪控三角洲-浊积扇沉积模式。本次研究厘清了低位域三角洲-浊积扇沉积体系的展布特征和形成机制,以期为在始新统温州组寻找岩性圈闭提供参考。  相似文献   

18.
溱潼凹陷属走滑伸展型断陷,应用层序地层学原理和方法,建立了阜一段的层序地层格架,并在阜一段识别出湖泊三角洲和湖泊两大沉积体系。同时结合含砂率与地震属性研究,恢复了阜一段低位域、湖扩域和高位域的沉积体系,认为各体系域沉积体系在时空展布上具有一定的继承性和差异性。综合分析认为,研究区阜一段东部的殷庄—广山地区在低位域时发育大型三角洲沉积体系,主要以前缘河口坝及席状砂沉积为主,可作为良好储集层;西部斜坡带华港—北汉庄地区,低位域及高位域均发育三角洲沉积体系且规模较大,主要为平原河道及前缘河口坝沉积,也可作为很好的油气储层。  相似文献   

19.
依据砂岩阴极发光、碎屑锆石形态及锆石U-Pb测年等资料,对舞阳凹陷核桃园组的物源进行了综合分析,认为舞3和舞8井核二段的物源来自于舞阳凹陷的南缘隆起区,与前人认识完全不同。根据这一认识,对舞阳凹陷核桃园组沉积体系与砂体分布进行了重新编图,并提出了新的砂体展布模式。核桃园组沉积时期舞阳凹陷内部砂体展布呈现明显的不对称性:凹陷南部斜坡带辫状河三角洲砂体向凹陷内部推进距离远,分布面积大,而凹陷北部陡坡带扇三角洲砂体沿边界断裂呈小朵状分布,砂体面积小。  相似文献   

20.
秦皇岛A油田位于渤海中部海域,区内油气藏主要发育在新近系的明化镇组。明化镇组下段为曲流河沉积地层,具有很强的非均质性,使得注水开发收效不均匀,平面矛盾突出。选取Ⅲ2砂体为研究对象,利用40余口钻井资料和覆盖油田的三维地震资料对储层内部结构和平面展布特征进行了系统的分析。研究认为,Ⅲ2砂体是由两期点坝砂体叠置而成,每一期砂体在平面上由4~5个单一点坝顺向组合而成,点坝之间的溢岸沉积是导致储层非均质性强的主要因素,控制了剩余油的分布。油田的生产动态证实,注入水流动规律与点坝砂体的平面展布具有良好的对应关系,部分井区水驱效果不均衡,个别单井产能低下都能从中找到原因。  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号